diff --git a/README.md b/README.md
index e4f6707f..d3d1130f 100644
--- a/README.md
+++ b/README.md
@@ -9,8 +9,8 @@ Fast open-source firmware for the [PineTime smartwatch](https://pine64.org/devic
 - [Getting started with InfiniTime](doc/gettingStarted/gettingStarted-1.0.md)
 - [Updating the software](doc/gettingStarted/updating-software.md)
 - [About the firmware and bootloader](doc/gettingStarted/about-software.md)
-- [PineTimeStyle Watch face](https://wiki.pine64.org/wiki/PineTimeStyle)
-  - [Weather integration](https://wiki.pine64.org/wiki/Infinitime-Weather)
+- [PineTimeStyle Watch face](https://pine64.org/documentation/PineTime/Watchfaces/PineTimeStyle)
+  - [Weather integration](https://pine64.org/documentation/PineTime/Software/InfiniTime_weather/)
 
 ### Companion apps
 
diff --git a/src/components/ble/SimpleWeatherService.cpp b/src/components/ble/SimpleWeatherService.cpp
index 146152f8..504cad14 100644
--- a/src/components/ble/SimpleWeatherService.cpp
+++ b/src/components/ble/SimpleWeatherService.cpp
@@ -80,7 +80,7 @@ int WeatherCallback(uint16_t /*connHandle*/, uint16_t /*attrHandle*/, struct ble
   return static_cast<Pinetime::Controllers::SimpleWeatherService*>(arg)->OnCommand(ctxt);
 }
 
-SimpleWeatherService::SimpleWeatherService(const DateTime& dateTimeController) : dateTimeController(dateTimeController) {
+SimpleWeatherService::SimpleWeatherService(DateTime& dateTimeController) : dateTimeController(dateTimeController) {
 }
 
 void SimpleWeatherService::Init() {
diff --git a/src/components/ble/SimpleWeatherService.h b/src/components/ble/SimpleWeatherService.h
index 4bbefcfc..03d2f6ff 100644
--- a/src/components/ble/SimpleWeatherService.h
+++ b/src/components/ble/SimpleWeatherService.h
@@ -40,7 +40,7 @@ namespace Pinetime {
 
     class SimpleWeatherService {
     public:
-      explicit SimpleWeatherService(const DateTime& dateTimeController);
+      explicit SimpleWeatherService(DateTime& dateTimeController);
 
       void Init();
 
@@ -140,7 +140,7 @@ namespace Pinetime {
 
       uint16_t eventHandle {};
 
-      const Pinetime::Controllers::DateTime& dateTimeController;
+      Pinetime::Controllers::DateTime& dateTimeController;
 
       std::optional<CurrentWeather> currentWeather;
       std::optional<Forecast> forecast;
diff --git a/src/components/brightness/BrightnessController.cpp b/src/components/brightness/BrightnessController.cpp
index 0392158c..4d1eba6a 100644
--- a/src/components/brightness/BrightnessController.cpp
+++ b/src/components/brightness/BrightnessController.cpp
@@ -2,38 +2,138 @@
 #include <hal/nrf_gpio.h>
 #include "displayapp/screens/Symbols.h"
 #include "drivers/PinMap.h"
+#include <libraries/delay/nrf_delay.h>
 using namespace Pinetime::Controllers;
 
+namespace {
+  // reinterpret_cast is not constexpr so this is the best we can do
+  static NRF_RTC_Type* const RTC = reinterpret_cast<NRF_RTC_Type*>(NRF_RTC2_BASE);
+}
+
 void BrightnessController::Init() {
   nrf_gpio_cfg_output(PinMap::LcdBacklightLow);
   nrf_gpio_cfg_output(PinMap::LcdBacklightMedium);
   nrf_gpio_cfg_output(PinMap::LcdBacklightHigh);
+
+  nrf_gpio_pin_clear(PinMap::LcdBacklightLow);
+  nrf_gpio_pin_clear(PinMap::LcdBacklightMedium);
+  nrf_gpio_pin_clear(PinMap::LcdBacklightHigh);
+
+  static_assert(timerFrequency == 32768, "Change the prescaler below");
+  RTC->PRESCALER = 0;
+  // CC1 switches the backlight on (pin transitions from high to low) and resets the counter to 0
+  RTC->CC[1] = timerPeriod;
+  // Enable compare events for CC0,CC1
+  RTC->EVTEN = 0b0000'0000'0000'0011'0000'0000'0000'0000;
+  // Disable all interrupts
+  RTC->INTENCLR = 0b0000'0000'0000'1111'0000'0000'0000'0011;
   Set(level);
 }
 
+void BrightnessController::ApplyBrightness(uint16_t rawBrightness) {
+  // The classic off, low, medium, high brightnesses are at {0, timerPeriod, timerPeriod*2, timerPeriod*3}
+  // These brightness levels do not use PWM: they only set/clear the corresponding pins
+  // Any brightness level between the above levels is achieved with efficient RTC based PWM on the next pin up
+  // E.g 2.5*timerPeriod corresponds to medium brightness with 50% PWM on the high pin
+  // Note: Raw brightness does not necessarily correspond to a linear perceived brightness
+
+  uint8_t pin;
+  if (rawBrightness > 2 * timerPeriod) {
+    rawBrightness -= 2 * timerPeriod;
+    pin = PinMap::LcdBacklightHigh;
+  } else if (rawBrightness > timerPeriod) {
+    rawBrightness -= timerPeriod;
+    pin = PinMap::LcdBacklightMedium;
+  } else {
+    pin = PinMap::LcdBacklightLow;
+  }
+  if (rawBrightness == timerPeriod || rawBrightness == 0) {
+    if (lastPin != UNSET) {
+      RTC->TASKS_STOP = 1;
+      nrf_delay_us(rtcStopTime);
+      nrf_ppi_channel_disable(ppiBacklightOff);
+      nrf_ppi_channel_disable(ppiBacklightOn);
+      nrfx_gpiote_out_uninit(lastPin);
+      nrf_gpio_cfg_output(lastPin);
+    }
+    lastPin = UNSET;
+    if (rawBrightness == 0) {
+      nrf_gpio_pin_set(pin);
+    } else {
+      nrf_gpio_pin_clear(pin);
+    }
+  } else {
+    // If the pin on which we are doing PWM is changing
+    // Disable old PWM channel (if exists) and set up new one
+    if (lastPin != pin) {
+      if (lastPin != UNSET) {
+        RTC->TASKS_STOP = 1;
+        nrf_delay_us(rtcStopTime);
+        nrf_ppi_channel_disable(ppiBacklightOff);
+        nrf_ppi_channel_disable(ppiBacklightOn);
+        nrfx_gpiote_out_uninit(lastPin);
+        nrf_gpio_cfg_output(lastPin);
+      }
+      nrfx_gpiote_out_config_t gpioteCfg = {.action = NRF_GPIOTE_POLARITY_TOGGLE,
+                                            .init_state = NRF_GPIOTE_INITIAL_VALUE_LOW,
+                                            .task_pin = true};
+      APP_ERROR_CHECK(nrfx_gpiote_out_init(pin, &gpioteCfg));
+      nrfx_gpiote_out_task_enable(pin);
+      nrf_ppi_channel_endpoint_setup(ppiBacklightOff,
+                                     reinterpret_cast<uint32_t>(&RTC->EVENTS_COMPARE[0]),
+                                     nrfx_gpiote_out_task_addr_get(pin));
+      nrf_ppi_channel_endpoint_setup(ppiBacklightOn,
+                                     reinterpret_cast<uint32_t>(&RTC->EVENTS_COMPARE[1]),
+                                     nrfx_gpiote_out_task_addr_get(pin));
+      nrf_ppi_fork_endpoint_setup(ppiBacklightOn, reinterpret_cast<uint32_t>(&RTC->TASKS_CLEAR));
+      nrf_ppi_channel_enable(ppiBacklightOff);
+      nrf_ppi_channel_enable(ppiBacklightOn);
+    } else {
+      // If the pin used for PWM isn't changing, we only need to set the pin state to the initial value (low)
+      RTC->TASKS_STOP = 1;
+      nrf_delay_us(rtcStopTime);
+      // Due to errata 20,179 and the intricacies of RTC timing, keep it simple: override the pin state
+      nrfx_gpiote_out_task_force(pin, false);
+    }
+    // CC0 switches the backlight off (pin transitions from low to high)
+    RTC->CC[0] = rawBrightness;
+    RTC->TASKS_CLEAR = 1;
+    RTC->TASKS_START = 1;
+    lastPin = pin;
+  }
+  switch (pin) {
+    case PinMap::LcdBacklightHigh:
+      nrf_gpio_pin_clear(PinMap::LcdBacklightLow);
+      nrf_gpio_pin_clear(PinMap::LcdBacklightMedium);
+      break;
+    case PinMap::LcdBacklightMedium:
+      nrf_gpio_pin_clear(PinMap::LcdBacklightLow);
+      nrf_gpio_pin_set(PinMap::LcdBacklightHigh);
+      break;
+    case PinMap::LcdBacklightLow:
+      nrf_gpio_pin_set(PinMap::LcdBacklightMedium);
+      nrf_gpio_pin_set(PinMap::LcdBacklightHigh);
+  }
+}
+
 void BrightnessController::Set(BrightnessController::Levels level) {
   this->level = level;
   switch (level) {
     default:
     case Levels::High:
-      nrf_gpio_pin_clear(PinMap::LcdBacklightLow);
-      nrf_gpio_pin_clear(PinMap::LcdBacklightMedium);
-      nrf_gpio_pin_clear(PinMap::LcdBacklightHigh);
+      ApplyBrightness(3 * timerPeriod);
       break;
     case Levels::Medium:
-      nrf_gpio_pin_clear(PinMap::LcdBacklightLow);
-      nrf_gpio_pin_clear(PinMap::LcdBacklightMedium);
-      nrf_gpio_pin_set(PinMap::LcdBacklightHigh);
+      ApplyBrightness(2 * timerPeriod);
       break;
     case Levels::Low:
-      nrf_gpio_pin_clear(PinMap::LcdBacklightLow);
-      nrf_gpio_pin_set(PinMap::LcdBacklightMedium);
-      nrf_gpio_pin_set(PinMap::LcdBacklightHigh);
+      ApplyBrightness(timerPeriod);
+      break;
+    case Levels::AlwaysOn:
+      ApplyBrightness(timerPeriod / 10);
       break;
     case Levels::Off:
-      nrf_gpio_pin_set(PinMap::LcdBacklightLow);
-      nrf_gpio_pin_set(PinMap::LcdBacklightMedium);
-      nrf_gpio_pin_set(PinMap::LcdBacklightHigh);
+      ApplyBrightness(0);
       break;
   }
 }
diff --git a/src/components/brightness/BrightnessController.h b/src/components/brightness/BrightnessController.h
index 7f86759a..650749a8 100644
--- a/src/components/brightness/BrightnessController.h
+++ b/src/components/brightness/BrightnessController.h
@@ -2,11 +2,14 @@
 
 #include <cstdint>
 
+#include "nrf_ppi.h"
+#include "nrfx_gpiote.h"
+
 namespace Pinetime {
   namespace Controllers {
     class BrightnessController {
     public:
-      enum class Levels { Off, Low, Medium, High };
+      enum class Levels { Off, AlwaysOn, Low, Medium, High };
       void Init();
 
       void Set(Levels level);
@@ -20,6 +23,25 @@ namespace Pinetime {
 
     private:
       Levels level = Levels::High;
+      static constexpr uint8_t UNSET = UINT8_MAX;
+      uint8_t lastPin = UNSET;
+      // Maximum time (μs) it takes for the RTC to fully stop
+      static constexpr uint8_t rtcStopTime = 46;
+      // Frequency of timer used for PWM (Hz)
+      static constexpr uint16_t timerFrequency = 32768;
+      // Backlight PWM frequency (Hz)
+      static constexpr uint16_t pwmFreq = 1000;
+      // Wraparound point in timer ticks
+      // Defines the number of brightness levels between each pin
+      static constexpr uint16_t timerPeriod = timerFrequency / pwmFreq;
+      // Warning: nimble reserves some PPIs
+      // https://github.com/InfiniTimeOrg/InfiniTime/blob/034d83fe6baf1ab3875a34f8cee387e24410a824/src/libs/mynewt-nimble/nimble/drivers/nrf52/src/ble_phy.c#L53
+      // SpiMaster uses PPI 0 for an erratum workaround
+      // Channel 1, 2 should be free to use
+      static constexpr nrf_ppi_channel_t ppiBacklightOn = NRF_PPI_CHANNEL1;
+      static constexpr nrf_ppi_channel_t ppiBacklightOff = NRF_PPI_CHANNEL2;
+
+      void ApplyBrightness(uint16_t val);
     };
   }
 }
diff --git a/src/components/datetime/DateTimeController.cpp b/src/components/datetime/DateTimeController.cpp
index f0ccb5e5..7f58c9b3 100644
--- a/src/components/datetime/DateTimeController.cpp
+++ b/src/components/datetime/DateTimeController.cpp
@@ -1,6 +1,8 @@
 #include "components/datetime/DateTimeController.h"
 #include <libraries/log/nrf_log.h>
 #include <systemtask/SystemTask.h>
+#include <hal/nrf_rtc.h>
+#include "nrf_assert.h"
 
 using namespace Pinetime::Controllers;
 
@@ -12,11 +14,16 @@ namespace {
 }
 
 DateTime::DateTime(Controllers::Settings& settingsController) : settingsController {settingsController} {
+  mutex = xSemaphoreCreateMutex();
+  ASSERT(mutex != nullptr);
+  xSemaphoreGive(mutex);
 }
 
 void DateTime::SetCurrentTime(std::chrono::time_point<std::chrono::system_clock, std::chrono::nanoseconds> t) {
+  xSemaphoreTake(mutex, portMAX_DELAY);
   this->currentDateTime = t;
-  UpdateTime(previousSystickCounter); // Update internal state without updating the time
+  UpdateTime(previousSystickCounter, true); // Update internal state without updating the time
+  xSemaphoreGive(mutex);
 }
 
 void DateTime::SetTime(uint16_t year, uint8_t month, uint8_t day, uint8_t hour, uint8_t minute, uint8_t second) {
@@ -29,13 +36,15 @@ void DateTime::SetTime(uint16_t year, uint8_t month, uint8_t day, uint8_t hour,
     /* .tm_year = */ year - 1900,
   };
 
-  tm.tm_isdst = -1; // Use DST value from local time zone
-  currentDateTime = std::chrono::system_clock::from_time_t(std::mktime(&tm));
-
   NRF_LOG_INFO("%d %d %d ", day, month, year);
   NRF_LOG_INFO("%d %d %d ", hour, minute, second);
 
-  UpdateTime(previousSystickCounter);
+  tm.tm_isdst = -1; // Use DST value from local time zone
+
+  xSemaphoreTake(mutex, portMAX_DELAY);
+  currentDateTime = std::chrono::system_clock::from_time_t(std::mktime(&tm));
+  UpdateTime(previousSystickCounter, true);
+  xSemaphoreGive(mutex);
 
   systemTask->PushMessage(System::Messages::OnNewTime);
 }
@@ -45,25 +54,34 @@ void DateTime::SetTimeZone(int8_t timezone, int8_t dst) {
   dstOffset = dst;
 }
 
-void DateTime::UpdateTime(uint32_t systickCounter) {
+std::chrono::time_point<std::chrono::system_clock, std::chrono::nanoseconds> DateTime::CurrentDateTime() {
+  xSemaphoreTake(mutex, portMAX_DELAY);
+  UpdateTime(nrf_rtc_counter_get(portNRF_RTC_REG), false);
+  xSemaphoreGive(mutex);
+  return currentDateTime;
+}
+
+void DateTime::UpdateTime(uint32_t systickCounter, bool forceUpdate) {
   // Handle systick counter overflow
   uint32_t systickDelta = 0;
   if (systickCounter < previousSystickCounter) {
-    systickDelta = 0xffffff - previousSystickCounter;
+    systickDelta = static_cast<uint32_t>(portNRF_RTC_MAXTICKS) - previousSystickCounter;
     systickDelta += systickCounter + 1;
   } else {
     systickDelta = systickCounter - previousSystickCounter;
   }
 
-  /*
-   * 1000 ms = 1024 ticks
-   */
-  auto correctedDelta = systickDelta / 1024;
-  auto rest = systickDelta % 1024;
+  auto correctedDelta = systickDelta / configTICK_RATE_HZ;
+  // If a second hasn't passed, there is nothing to do
+  // If the time has been changed, set forceUpdate to trigger internal state updates
+  if (correctedDelta == 0 && !forceUpdate) {
+    return;
+  }
+  auto rest = systickDelta % configTICK_RATE_HZ;
   if (systickCounter >= rest) {
     previousSystickCounter = systickCounter - rest;
   } else {
-    previousSystickCounter = 0xffffff - (rest - systickCounter);
+    previousSystickCounter = static_cast<uint32_t>(portNRF_RTC_MAXTICKS) - (rest - systickCounter - 1);
   }
 
   currentDateTime += std::chrono::seconds(correctedDelta);
diff --git a/src/components/datetime/DateTimeController.h b/src/components/datetime/DateTimeController.h
index f719df7d..5a453f20 100644
--- a/src/components/datetime/DateTimeController.h
+++ b/src/components/datetime/DateTimeController.h
@@ -5,6 +5,8 @@
 #include <ctime>
 #include <string>
 #include "components/settings/Settings.h"
+#include <FreeRTOS.h>
+#include <semphr.h>
 
 namespace Pinetime {
   namespace System {
@@ -45,8 +47,6 @@ namespace Pinetime {
        */
       void SetTimeZone(int8_t timezone, int8_t dst);
 
-      void UpdateTime(uint32_t systickCounter);
-
       uint16_t Year() const {
         return 1900 + localTime.tm_year;
       }
@@ -124,12 +124,10 @@ namespace Pinetime {
       static const char* MonthShortToStringLow(Months month);
       static const char* DayOfWeekShortToStringLow(Days day);
 
-      std::chrono::time_point<std::chrono::system_clock, std::chrono::nanoseconds> CurrentDateTime() const {
-        return currentDateTime;
-      }
+      std::chrono::time_point<std::chrono::system_clock, std::chrono::nanoseconds> CurrentDateTime();
 
-      std::chrono::time_point<std::chrono::system_clock, std::chrono::nanoseconds> UTCDateTime() const {
-        return currentDateTime - std::chrono::seconds((tzOffset + dstOffset) * 15 * 60);
+      std::chrono::time_point<std::chrono::system_clock, std::chrono::nanoseconds> UTCDateTime() {
+        return CurrentDateTime() - std::chrono::seconds((tzOffset + dstOffset) * 15 * 60);
       }
 
       std::chrono::seconds Uptime() const {
@@ -141,10 +139,14 @@ namespace Pinetime {
       std::string FormattedTime();
 
     private:
+      void UpdateTime(uint32_t systickCounter, bool forceUpdate);
+
       std::tm localTime;
       int8_t tzOffset = 0;
       int8_t dstOffset = 0;
 
+      SemaphoreHandle_t mutex = nullptr;
+
       uint32_t previousSystickCounter = 0;
       std::chrono::time_point<std::chrono::system_clock, std::chrono::nanoseconds> currentDateTime;
       std::chrono::seconds uptime {0};
diff --git a/src/components/datetime/TODO.md b/src/components/datetime/TODO.md
new file mode 100644
index 00000000..e9590898
--- /dev/null
+++ b/src/components/datetime/TODO.md
@@ -0,0 +1,41 @@
+# Refactoring needed
+
+## Context
+
+The [PR #2041 - Continuous time updates](https://github.com/InfiniTimeOrg/InfiniTime/pull/2041) highlighted some
+limitations in the design of DateTimeController: the granularity of the time returned by `DateTime::CurrentDateTime()`
+is limited by the frequency at which SystemTask calls `DateTime::UpdateTime()`, which is currently set to 100ms.
+
+@mark9064 provided more details
+in [this comment](https://github.com/InfiniTimeOrg/InfiniTime/pull/2041#issuecomment-2048528967).
+
+The [PR #2041 - Continuous time updates](https://github.com/InfiniTimeOrg/InfiniTime/pull/2041) provided some changes
+to `DateTime` controller that improves the granularity of the time returned by `DateTime::CurrentDateTime()`.
+
+However, the review showed that `DateTime` cannot be `const` anymore, even when it's only used to get the current time,
+since `DateTime::CurrentDateTime()` changes the internal state of the instance.
+
+We tried to identify alternative implementation that would have maintained the "const correctness" but we eventually
+figured that this would lead to a re-design of `DateTime` which was out of scope of the initial PR (Continuous time
+updates and always on display).
+
+So we decided to merge this PR #2041 and agree to fix/improve `DateTime` later on.
+
+## What needs to be done?
+
+Improve/redesign `DateTime` so that it
+
+* provides a very granular (ideally down to the millisecond) date and time via `CurrentDateTime()`.
+* can be declared/passed as `const` when it's only used to **get** the time.
+* limits the use of mutex as much as possible (an ideal implementation would not use any mutex, but this might not be
+  possible).
+* improves the design of `DateTime::Seconds()`, `DateTime::Minutes()`, `DateTime::Hours()`, etc as
+  explained [in this comment](https://github.com/InfiniTimeOrg/InfiniTime/pull/2054#pullrequestreview-2037033105).
+
+Once this redesign is implemented, all instances/references to `DateTime` should be reviewed and updated to use `const`
+where appropriate.
+
+Please check the following PR to get more context about this redesign:
+
+* [#2041 - Continuous time updates by @mark9064](https://github.com/InfiniTimeOrg/InfiniTime/pull/2041)
+* [#2054 - Continuous time update - Alternative implementation to #2041 by @JF002](https://github.com/InfiniTimeOrg/InfiniTime/pull/2054)
\ No newline at end of file
diff --git a/src/components/settings/Settings.h b/src/components/settings/Settings.h
index 06312077..602de3a5 100644
--- a/src/components/settings/Settings.h
+++ b/src/components/settings/Settings.h
@@ -214,6 +214,21 @@ namespace Pinetime {
         return settings.screenTimeOut;
       };
 
+      bool GetAlwaysOnDisplay() const {
+        return settings.alwaysOnDisplay && GetNotificationStatus() != Notification::Sleep;
+      };
+
+      void SetAlwaysOnDisplaySetting(bool state) {
+        if (state != settings.alwaysOnDisplay) {
+          settingsChanged = true;
+        }
+        settings.alwaysOnDisplay = state;
+      }
+
+      bool GetAlwaysOnDisplaySetting() const {
+        return settings.alwaysOnDisplay;
+      }
+
       void SetShakeThreshold(uint16_t thresh) {
         if (settings.shakeWakeThreshold != thresh) {
           settings.shakeWakeThreshold = thresh;
@@ -286,13 +301,15 @@ namespace Pinetime {
     private:
       Pinetime::Controllers::FS& fs;
 
-      static constexpr uint32_t settingsVersion = 0x0007;
+      static constexpr uint32_t settingsVersion = 0x0008;
 
       struct SettingsData {
         uint32_t version = settingsVersion;
         uint32_t stepsGoal = 10000;
         uint32_t screenTimeOut = 15000;
 
+        bool alwaysOnDisplay = false;
+
         ClockType clockType = ClockType::H24;
         WeatherFormat weatherFormat = WeatherFormat::Metric;
         Notification notificationStatus = Notification::On;
diff --git a/src/displayapp/DisplayApp.cpp b/src/displayapp/DisplayApp.cpp
index 3fd34b3a..394a3239 100644
--- a/src/displayapp/DisplayApp.cpp
+++ b/src/displayapp/DisplayApp.cpp
@@ -81,7 +81,8 @@ DisplayApp::DisplayApp(Drivers::St7789& lcd,
                        Pinetime::Controllers::AlarmController& alarmController,
                        Pinetime::Controllers::BrightnessController& brightnessController,
                        Pinetime::Controllers::TouchHandler& touchHandler,
-                       Pinetime::Controllers::FS& filesystem)
+                       Pinetime::Controllers::FS& filesystem,
+                       Pinetime::Drivers::SpiNorFlash& spiNorFlash)
   : lcd {lcd},
     touchPanel {touchPanel},
     batteryController {batteryController},
@@ -97,6 +98,7 @@ DisplayApp::DisplayApp(Drivers::St7789& lcd,
     brightnessController {brightnessController},
     touchHandler {touchHandler},
     filesystem {filesystem},
+    spiNorFlash {spiNorFlash},
     lvgl {lcd, filesystem},
     timer(this, TimerCallback),
     controllers {batteryController,
@@ -154,6 +156,36 @@ void DisplayApp::InitHw() {
   lcd.Init();
 }
 
+TickType_t DisplayApp::CalculateSleepTime() {
+  TickType_t ticksElapsed = xTaskGetTickCount() - alwaysOnStartTime;
+  // Divide both the numerator and denominator by 8 to increase the number of ticks (frames) before the overflow tick is reached
+  TickType_t elapsedTarget = ROUNDED_DIV((configTICK_RATE_HZ / 8) * alwaysOnTickCount * alwaysOnRefreshPeriod, 1000 / 8);
+  // ROUNDED_DIV overflows when numerator + (denominator floordiv 2) > uint32 max
+  // in this case around 9 hours
+  constexpr TickType_t overflowTick = (UINT32_MAX - (1000 / 16)) / ((configTICK_RATE_HZ / 8) * alwaysOnRefreshPeriod);
+
+  // Assumptions
+
+  // Tick rate is multiple of 8
+  // Needed for division trick above
+  static_assert(configTICK_RATE_HZ % 8 == 0);
+
+  // Local tick count must always wraparound before the system tick count does
+  // As a static assert we can use 64 bit ints and therefore dodge overflows
+  // Always on overflow time (ms) < system tick overflow time (ms)
+  static_assert((uint64_t) overflowTick * (uint64_t) alwaysOnRefreshPeriod < (uint64_t) UINT32_MAX * 1000ULL / configTICK_RATE_HZ);
+
+  if (alwaysOnTickCount == overflowTick) {
+    alwaysOnTickCount = 0;
+    alwaysOnStartTime = xTaskGetTickCount();
+  }
+  if (elapsedTarget > ticksElapsed) {
+    return elapsedTarget - ticksElapsed;
+  } else {
+    return 0;
+  }
+}
+
 void DisplayApp::Refresh() {
   auto LoadPreviousScreen = [this]() {
     FullRefreshDirections returnDirection;
@@ -203,7 +235,29 @@ void DisplayApp::Refresh() {
   TickType_t queueTimeout;
   switch (state) {
     case States::Idle:
-      queueTimeout = portMAX_DELAY;
+      if (settingsController.GetAlwaysOnDisplay()) {
+        if (!currentScreen->IsRunning()) {
+          LoadPreviousScreen();
+        }
+        // Check we've slept long enough
+        // Might not be true if the loop received an event
+        // If not true, then wait that amount of time
+        queueTimeout = CalculateSleepTime();
+        if (queueTimeout == 0) {
+          // Only advance the tick count when LVGL is done
+          // Otherwise keep running the task handler while it still has things to draw
+          // Note: under high graphics load, LVGL will always have more work to do
+          if (lv_task_handler() > 0) {
+            // Drop frames that we've missed if drawing/event handling took way longer than expected
+            while (queueTimeout == 0) {
+              alwaysOnTickCount += 1;
+              queueTimeout = CalculateSleepTime();
+            }
+          };
+        }
+      } else {
+        queueTimeout = portMAX_DELAY;
+      }
       break;
     case States::Running:
       if (!currentScreen->IsRunning()) {
@@ -234,20 +288,34 @@ void DisplayApp::Refresh() {
       case Messages::DimScreen:
         DimScreen();
         break;
-      case Messages::RestoreBrightness:
-        RestoreBrightness();
-        break;
       case Messages::GoToSleep:
-        while (brightnessController.Level() != Controllers::BrightnessController::Levels::Off) {
+        while (brightnessController.Level() != Controllers::BrightnessController::Levels::Low) {
           brightnessController.Lower();
           vTaskDelay(100);
         }
-        lcd.Sleep();
+        // Don't actually turn off the display for AlwaysOn mode
+        if (settingsController.GetAlwaysOnDisplay()) {
+          brightnessController.Set(Controllers::BrightnessController::Levels::AlwaysOn);
+          lcd.LowPowerOn();
+          // Record idle entry time
+          alwaysOnTickCount = 0;
+          alwaysOnStartTime = xTaskGetTickCount();
+        } else {
+          brightnessController.Set(Controllers::BrightnessController::Levels::Off);
+          lcd.Sleep();
+        }
         PushMessageToSystemTask(Pinetime::System::Messages::OnDisplayTaskSleeping);
         state = States::Idle;
         break;
+      case Messages::NotifyDeviceActivity:
+        lv_disp_trig_activity(nullptr);
+        break;
       case Messages::GoToRunning:
-        lcd.Wakeup();
+        if (settingsController.GetAlwaysOnDisplay()) {
+          lcd.LowPowerOff();
+        } else {
+          lcd.Wakeup();
+        }
         lv_disp_trig_activity(nullptr);
         ApplyBrightness();
         state = States::Running;
@@ -535,7 +603,8 @@ void DisplayApp::LoadScreen(Apps app, DisplayApp::FullRefreshDirections directio
                                                             bleController,
                                                             watchdog,
                                                             motionController,
-                                                            touchPanel);
+                                                            touchPanel,
+                                                            spiNorFlash);
       break;
     case Apps::FlashLight:
       currentScreen = std::make_unique<Screens::FlashLight>(*systemTask, brightnessController);
diff --git a/src/displayapp/DisplayApp.h b/src/displayapp/DisplayApp.h
index 96bce4dd..d443b8b2 100644
--- a/src/displayapp/DisplayApp.h
+++ b/src/displayapp/DisplayApp.h
@@ -66,7 +66,8 @@ namespace Pinetime {
                  Pinetime::Controllers::AlarmController& alarmController,
                  Pinetime::Controllers::BrightnessController& brightnessController,
                  Pinetime::Controllers::TouchHandler& touchHandler,
-                 Pinetime::Controllers::FS& filesystem);
+                 Pinetime::Controllers::FS& filesystem,
+                 Pinetime::Drivers::SpiNorFlash& spiNorFlash);
       void Start(System::BootErrors error);
       void PushMessage(Display::Messages msg);
 
@@ -96,6 +97,7 @@ namespace Pinetime {
       Pinetime::Controllers::BrightnessController& brightnessController;
       Pinetime::Controllers::TouchHandler& touchHandler;
       Pinetime::Controllers::FS& filesystem;
+      Pinetime::Drivers::SpiNorFlash& spiNorFlash;
 
       Pinetime::Controllers::FirmwareValidator validator;
       Pinetime::Components::LittleVgl lvgl;
@@ -135,6 +137,13 @@ namespace Pinetime {
       Utility::StaticStack<FullRefreshDirections, returnAppStackSize> appStackDirections;
 
       bool isDimmed = false;
+
+      TickType_t CalculateSleepTime();
+      TickType_t alwaysOnTickCount;
+      TickType_t alwaysOnStartTime;
+      // If this is to be changed, make sure the actual always on refresh rate is changed
+      // by configuring the LCD refresh timings
+      static constexpr uint32_t alwaysOnRefreshPeriod = 500;
     };
   }
 }
diff --git a/src/displayapp/DisplayAppRecovery.cpp b/src/displayapp/DisplayAppRecovery.cpp
index 28892723..bcb8db0e 100644
--- a/src/displayapp/DisplayAppRecovery.cpp
+++ b/src/displayapp/DisplayAppRecovery.cpp
@@ -24,7 +24,8 @@ DisplayApp::DisplayApp(Drivers::St7789& lcd,
                        Pinetime::Controllers::AlarmController& /*alarmController*/,
                        Pinetime::Controllers::BrightnessController& /*brightnessController*/,
                        Pinetime::Controllers::TouchHandler& /*touchHandler*/,
-                       Pinetime::Controllers::FS& /*filesystem*/)
+                       Pinetime::Controllers::FS& /*filesystem*/,
+                       Pinetime::Drivers::SpiNorFlash& /*spiNorFlash*/)
   : lcd {lcd}, bleController {bleController} {
 }
 
diff --git a/src/displayapp/DisplayAppRecovery.h b/src/displayapp/DisplayAppRecovery.h
index c1bf6243..162ff257 100644
--- a/src/displayapp/DisplayAppRecovery.h
+++ b/src/displayapp/DisplayAppRecovery.h
@@ -18,6 +18,7 @@ namespace Pinetime {
     class St7789;
     class Cst816S;
     class Watchdog;
+    class SpiNorFlash;
   }
 
   namespace Controllers {
@@ -59,7 +60,8 @@ namespace Pinetime {
                  Pinetime::Controllers::AlarmController& alarmController,
                  Pinetime::Controllers::BrightnessController& brightnessController,
                  Pinetime::Controllers::TouchHandler& touchHandler,
-                 Pinetime::Controllers::FS& filesystem);
+                 Pinetime::Controllers::FS& filesystem,
+                 Pinetime::Drivers::SpiNorFlash& spiNorFlash);
       void Start();
 
       void Start(Pinetime::System::BootErrors) {
diff --git a/src/displayapp/Messages.h b/src/displayapp/Messages.h
index dada3088..1418f6be 100644
--- a/src/displayapp/Messages.h
+++ b/src/displayapp/Messages.h
@@ -18,7 +18,7 @@ namespace Pinetime {
         TimerDone,
         BleFirmwareUpdateStarted,
         DimScreen,
-        RestoreBrightness,
+        NotifyDeviceActivity,
         ShowPairingKey,
         AlarmTriggered,
         Chime,
diff --git a/src/displayapp/screens/FlashLight.cpp b/src/displayapp/screens/FlashLight.cpp
index 1b7cf39c..f169fac1 100644
--- a/src/displayapp/screens/FlashLight.cpp
+++ b/src/displayapp/screens/FlashLight.cpp
@@ -17,6 +17,7 @@ namespace {
 FlashLight::FlashLight(System::SystemTask& systemTask, Controllers::BrightnessController& brightnessController)
   : systemTask {systemTask}, brightnessController {brightnessController} {
 
+  previousBrightnessLevel = brightnessController.Level();
   brightnessController.Set(Controllers::BrightnessController::Levels::Low);
 
   flashLight = lv_label_create(lv_scr_act(), nullptr);
@@ -52,6 +53,7 @@ FlashLight::FlashLight(System::SystemTask& systemTask, Controllers::BrightnessCo
 FlashLight::~FlashLight() {
   lv_obj_clean(lv_scr_act());
   lv_obj_set_style_local_bg_color(lv_scr_act(), LV_OBJ_PART_MAIN, LV_STATE_DEFAULT, LV_COLOR_BLACK);
+  brightnessController.Set(previousBrightnessLevel);
   systemTask.PushMessage(Pinetime::System::Messages::EnableSleeping);
 }
 
diff --git a/src/displayapp/screens/FlashLight.h b/src/displayapp/screens/FlashLight.h
index 2b710ed5..c5404e93 100644
--- a/src/displayapp/screens/FlashLight.h
+++ b/src/displayapp/screens/FlashLight.h
@@ -27,6 +27,7 @@ namespace Pinetime {
         Controllers::BrightnessController& brightnessController;
 
         Controllers::BrightnessController::Levels brightnessLevel = Controllers::BrightnessController::Levels::High;
+        Controllers::BrightnessController::Levels previousBrightnessLevel;
 
         lv_obj_t* flashLight;
         lv_obj_t* backgroundAction;
diff --git a/src/displayapp/screens/SystemInfo.cpp b/src/displayapp/screens/SystemInfo.cpp
index 18fb7ad2..dd39f88a 100644
--- a/src/displayapp/screens/SystemInfo.cpp
+++ b/src/displayapp/screens/SystemInfo.cpp
@@ -38,7 +38,8 @@ SystemInfo::SystemInfo(Pinetime::Applications::DisplayApp* app,
                        const Pinetime::Controllers::Ble& bleController,
                        const Pinetime::Drivers::Watchdog& watchdog,
                        Pinetime::Controllers::MotionController& motionController,
-                       const Pinetime::Drivers::Cst816S& touchPanel)
+                       const Pinetime::Drivers::Cst816S& touchPanel,
+                       const Pinetime::Drivers::SpiNorFlash& spiNorFlash)
   : app {app},
     dateTimeController {dateTimeController},
     batteryController {batteryController},
@@ -47,6 +48,7 @@ SystemInfo::SystemInfo(Pinetime::Applications::DisplayApp* app,
     watchdog {watchdog},
     motionController {motionController},
     touchPanel {touchPanel},
+    spiNorFlash {spiNorFlash},
     screens {app,
              0,
              {[this]() -> std::unique_ptr<Screen> {
@@ -186,10 +188,12 @@ std::unique_ptr<Screen> SystemInfo::CreateScreen3() {
   lv_obj_t* label = lv_label_create(lv_scr_act(), nullptr);
   lv_label_set_recolor(label, true);
   const auto& bleAddr = bleController.Address();
+  auto spiFlashId = spiNorFlash.GetIdentification();
   lv_label_set_text_fmt(label,
                         "#808080 BLE MAC#\n"
-                        " %02x:%02x:%02x:%02x:%02x:%02x"
+                        " %02x:%02x:%02x:%02x:%02x:%02x\n"
                         "\n"
+                        "#808080 SPI Flash# %02x-%02x-%02x\n"
                         "\n"
                         "#808080 Memory heap#\n"
                         " #808080 Free# %d\n"
@@ -202,6 +206,9 @@ std::unique_ptr<Screen> SystemInfo::CreateScreen3() {
                         bleAddr[2],
                         bleAddr[1],
                         bleAddr[0],
+                        spiFlashId.manufacturer,
+                        spiFlashId.type,
+                        spiFlashId.density,
                         xPortGetFreeHeapSize(),
                         xPortGetMinimumEverFreeHeapSize(),
                         mallocFailedCount,
diff --git a/src/displayapp/screens/SystemInfo.h b/src/displayapp/screens/SystemInfo.h
index 199af51e..3129c463 100644
--- a/src/displayapp/screens/SystemInfo.h
+++ b/src/displayapp/screens/SystemInfo.h
@@ -29,7 +29,8 @@ namespace Pinetime {
                             const Pinetime::Controllers::Ble& bleController,
                             const Pinetime::Drivers::Watchdog& watchdog,
                             Pinetime::Controllers::MotionController& motionController,
-                            const Pinetime::Drivers::Cst816S& touchPanel);
+                            const Pinetime::Drivers::Cst816S& touchPanel,
+                            const Pinetime::Drivers::SpiNorFlash& spiNorFlash);
         ~SystemInfo() override;
         bool OnTouchEvent(TouchEvents event) override;
 
@@ -42,6 +43,7 @@ namespace Pinetime {
         const Pinetime::Drivers::Watchdog& watchdog;
         Pinetime::Controllers::MotionController& motionController;
         const Pinetime::Drivers::Cst816S& touchPanel;
+        const Pinetime::Drivers::SpiNorFlash& spiNorFlash;
 
         ScreenList<5> screens;
 
diff --git a/src/displayapp/screens/WatchFaceAnalog.h b/src/displayapp/screens/WatchFaceAnalog.h
index 2eee657e..958ff64d 100644
--- a/src/displayapp/screens/WatchFaceAnalog.h
+++ b/src/displayapp/screens/WatchFaceAnalog.h
@@ -75,7 +75,7 @@ namespace Pinetime {
 
         BatteryIcon batteryIcon;
 
-        const Controllers::DateTime& dateTimeController;
+        Controllers::DateTime& dateTimeController;
         const Controllers::Battery& batteryController;
         const Controllers::Ble& bleController;
         Controllers::NotificationManager& notificationManager;
diff --git a/src/displayapp/screens/settings/SettingDisplay.cpp b/src/displayapp/screens/settings/SettingDisplay.cpp
index bd533e67..57a64d7f 100644
--- a/src/displayapp/screens/settings/SettingDisplay.cpp
+++ b/src/displayapp/screens/settings/SettingDisplay.cpp
@@ -9,10 +9,17 @@
 using namespace Pinetime::Applications::Screens;
 
 namespace {
-  void event_handler(lv_obj_t* obj, lv_event_t event) {
+  void TimeoutEventHandler(lv_obj_t* obj, lv_event_t event) {
     auto* screen = static_cast<SettingDisplay*>(obj->user_data);
     screen->UpdateSelected(obj, event);
   }
+
+  void AlwaysOnEventHandler(lv_obj_t* obj, lv_event_t event) {
+    if (event == LV_EVENT_VALUE_CHANGED) {
+      auto* screen = static_cast<SettingDisplay*>(obj->user_data);
+      screen->ToggleAlwaysOn();
+    }
+  }
 }
 
 constexpr std::array<uint16_t, 6> SettingDisplay::options;
@@ -49,13 +56,20 @@ SettingDisplay::SettingDisplay(Pinetime::Applications::DisplayApp* app, Pinetime
     snprintf(buffer, sizeof(buffer), "%2" PRIu16 "s", options[i] / 1000);
     lv_checkbox_set_text(cbOption[i], buffer);
     cbOption[i]->user_data = this;
-    lv_obj_set_event_cb(cbOption[i], event_handler);
+    lv_obj_set_event_cb(cbOption[i], TimeoutEventHandler);
     SetRadioButtonStyle(cbOption[i]);
 
     if (settingsController.GetScreenTimeOut() == options[i]) {
       lv_checkbox_set_checked(cbOption[i], true);
     }
   }
+
+  alwaysOnCheckbox = lv_checkbox_create(container1, nullptr);
+  lv_checkbox_set_text(alwaysOnCheckbox, "Always On");
+  lv_checkbox_set_checked(alwaysOnCheckbox, settingsController.GetAlwaysOnDisplaySetting());
+  lv_obj_add_state(alwaysOnCheckbox, LV_STATE_DEFAULT);
+  alwaysOnCheckbox->user_data = this;
+  lv_obj_set_event_cb(alwaysOnCheckbox, AlwaysOnEventHandler);
 }
 
 SettingDisplay::~SettingDisplay() {
@@ -63,6 +77,11 @@ SettingDisplay::~SettingDisplay() {
   settingsController.SaveSettings();
 }
 
+void SettingDisplay::ToggleAlwaysOn() {
+  settingsController.SetAlwaysOnDisplaySetting(!settingsController.GetAlwaysOnDisplaySetting());
+  lv_checkbox_set_checked(alwaysOnCheckbox, settingsController.GetAlwaysOnDisplaySetting());
+}
+
 void SettingDisplay::UpdateSelected(lv_obj_t* object, lv_event_t event) {
   if (event == LV_EVENT_CLICKED) {
     for (unsigned int i = 0; i < options.size(); i++) {
diff --git a/src/displayapp/screens/settings/SettingDisplay.h b/src/displayapp/screens/settings/SettingDisplay.h
index 64212c02..b6d147c8 100644
--- a/src/displayapp/screens/settings/SettingDisplay.h
+++ b/src/displayapp/screens/settings/SettingDisplay.h
@@ -18,6 +18,7 @@ namespace Pinetime {
         ~SettingDisplay() override;
 
         void UpdateSelected(lv_obj_t* object, lv_event_t event);
+        void ToggleAlwaysOn();
 
       private:
         DisplayApp* app;
@@ -25,6 +26,7 @@ namespace Pinetime {
 
         Controllers::Settings& settingsController;
         lv_obj_t* cbOption[options.size()];
+        lv_obj_t* alwaysOnCheckbox;
       };
     }
   }
diff --git a/src/drivers/SpiNorFlash.cpp b/src/drivers/SpiNorFlash.cpp
index 56a8aabd..3bc45cca 100644
--- a/src/drivers/SpiNorFlash.cpp
+++ b/src/drivers/SpiNorFlash.cpp
@@ -10,7 +10,7 @@ SpiNorFlash::SpiNorFlash(Spi& spi) : spi {spi} {
 }
 
 void SpiNorFlash::Init() {
-  device_id = ReadIdentificaion();
+  device_id = ReadIdentification();
   NRF_LOG_INFO("[SpiNorFlash] Manufacturer : %d, Memory type : %d, memory density : %d",
                device_id.manufacturer,
                device_id.type,
@@ -32,7 +32,7 @@ void SpiNorFlash::Wakeup() {
   uint8_t cmd[cmdSize] = {static_cast<uint8_t>(Commands::ReleaseFromDeepPowerDown), 0x01, 0x02, 0x03};
   uint8_t id = 0;
   spi.Read(reinterpret_cast<uint8_t*>(&cmd), cmdSize, &id, 1);
-  auto devId = device_id = ReadIdentificaion();
+  auto devId = device_id = ReadIdentification();
   if (devId.type != device_id.type) {
     NRF_LOG_INFO("[SpiNorFlash] ID on Wakeup: Failed");
   } else {
@@ -41,7 +41,7 @@ void SpiNorFlash::Wakeup() {
   NRF_LOG_INFO("[SpiNorFlash] Wakeup")
 }
 
-SpiNorFlash::Identification SpiNorFlash::ReadIdentificaion() {
+SpiNorFlash::Identification SpiNorFlash::ReadIdentification() {
   auto cmd = static_cast<uint8_t>(Commands::ReadIdentification);
   Identification identification;
   spi.Read(&cmd, 1, reinterpret_cast<uint8_t*>(&identification), sizeof(Identification));
@@ -145,3 +145,7 @@ void SpiNorFlash::Write(uint32_t address, const uint8_t* buffer, size_t size) {
     len -= toWrite;
   }
 }
+
+SpiNorFlash::Identification SpiNorFlash::GetIdentification() const {
+  return device_id;
+}
diff --git a/src/drivers/SpiNorFlash.h b/src/drivers/SpiNorFlash.h
index 8a063fea..028f92b4 100644
--- a/src/drivers/SpiNorFlash.h
+++ b/src/drivers/SpiNorFlash.h
@@ -20,7 +20,6 @@ namespace Pinetime {
         uint8_t density = 0;
       };
 
-      Identification ReadIdentificaion();
       uint8_t ReadStatusRegister();
       bool WriteInProgress();
       bool WriteEnabled();
@@ -33,6 +32,8 @@ namespace Pinetime {
       bool ProgramFailed();
       bool EraseFailed();
 
+      Identification GetIdentification() const;
+
       void Init();
       void Uninit();
 
@@ -40,6 +41,8 @@ namespace Pinetime {
       void Wakeup();
 
     private:
+      Identification ReadIdentification();
+
       enum class Commands : uint8_t {
         PageProgram = 0x02,
         Read = 0x03,
diff --git a/src/drivers/St7789.cpp b/src/drivers/St7789.cpp
index 12e95a41..0df19b45 100644
--- a/src/drivers/St7789.cpp
+++ b/src/drivers/St7789.cpp
@@ -1,3 +1,4 @@
+#include <cstring>
 #include "drivers/St7789.h"
 #include <hal/nrf_gpio.h>
 #include <nrfx_log.h>
@@ -15,17 +16,22 @@ void St7789::Init() {
   nrf_gpio_pin_set(pinReset);
   HardwareReset();
   SoftwareReset();
+  Command2Enable();
   SleepOut();
-  ColMod();
+  PixelFormat();
   MemoryDataAccessControl();
-  ColumnAddressSet();
-  RowAddressSet();
+  SetAddrWindow(0, 0, Width, Height);
 // P8B Mirrored version does not need display inversion.
 #ifndef DRIVER_DISPLAY_MIRROR
   DisplayInversionOn();
 #endif
+  PorchSet();
+  FrameRateNormalSet();
+  IdleFrameRateOff();
   NormalModeOn();
   SetVdv();
+  PowerControl();
+  GateControl();
   DisplayOn();
 }
 
@@ -63,6 +69,17 @@ void St7789::SoftwareReset() {
   vTaskDelay(pdMS_TO_TICKS(125));
 }
 
+void St7789::Command2Enable() {
+  WriteCommand(static_cast<uint8_t>(Commands::Command2Enable));
+  constexpr uint8_t args[] = {
+    0x5a, // Constant
+    0x69, // Constant
+    0x02, // Constant
+    0x01, // Enable
+  };
+  WriteData(args, sizeof(args));
+}
+
 void St7789::SleepOut() {
   if (!sleepIn) {
     return;
@@ -97,8 +114,9 @@ void St7789::SleepIn() {
   sleepIn = true;
 }
 
-void St7789::ColMod() {
-  WriteCommand(static_cast<uint8_t>(Commands::ColMod));
+void St7789::PixelFormat() {
+  WriteCommand(static_cast<uint8_t>(Commands::PixelFormat));
+  // 65K colours, 16-bit per pixel
   WriteData(0x55);
 }
 
@@ -118,22 +136,6 @@ void St7789::MemoryDataAccessControl() {
 #endif
 }
 
-void St7789::ColumnAddressSet() {
-  WriteCommand(static_cast<uint8_t>(Commands::ColumnAddressSet));
-  WriteData(0x00);
-  WriteData(0x00);
-  WriteData(Width >> 8u);
-  WriteData(Width & 0xffu);
-}
-
-void St7789::RowAddressSet() {
-  WriteCommand(static_cast<uint8_t>(Commands::RowAddressSet));
-  WriteData(0x00);
-  WriteData(0x00);
-  WriteData(320u >> 8u);
-  WriteData(320u & 0xffu);
-}
-
 void St7789::DisplayInversionOn() {
   WriteCommand(static_cast<uint8_t>(Commands::DisplayInversionOn));
 }
@@ -142,22 +144,98 @@ void St7789::NormalModeOn() {
   WriteCommand(static_cast<uint8_t>(Commands::NormalModeOn));
 }
 
+void St7789::IdleModeOn() {
+  WriteCommand(static_cast<uint8_t>(Commands::IdleModeOn));
+}
+
+void St7789::IdleModeOff() {
+  WriteCommand(static_cast<uint8_t>(Commands::IdleModeOff));
+}
+
+void St7789::PorchSet() {
+  WriteCommand(static_cast<uint8_t>(Commands::Porch));
+  constexpr uint8_t args[] = {
+    0x02, // Normal mode front porch
+    0x03, // Normal mode back porch
+    0x01, // Porch control enable
+    0xed, // Idle mode front:back porch
+    0xed, // Partial mode front:back porch (partial mode unused but set anyway)
+  };
+  WriteData(args, sizeof(args));
+}
+
+void St7789::FrameRateNormalSet() {
+  WriteCommand(static_cast<uint8_t>(Commands::FrameRateNormal));
+  // Note that the datasheet table is imprecise - see formula below table
+  WriteData(0x0a);
+}
+
+void St7789::IdleFrameRateOn() {
+  WriteCommand(static_cast<uint8_t>(Commands::FrameRateIdle));
+  // According to the datasheet, these controls should apply only to partial/idle mode
+  // However they appear to apply to normal mode, so we have to enable/disable
+  // every time we enter/exit always on
+  // In testing this divider appears to actually be 16x?
+  constexpr uint8_t args[] = {
+    0x13, // Enable frame rate control for partial/idle mode, 8x frame divider
+    0x1e, // Idle mode frame rate
+    0x1e, // Partial mode frame rate (unused)
+  };
+  WriteData(args, sizeof(args));
+}
+
+void St7789::IdleFrameRateOff() {
+  WriteCommand(static_cast<uint8_t>(Commands::FrameRateIdle));
+  constexpr uint8_t args[] = {
+    0x00, // Disable frame rate control and divider
+    0x0a, // Idle mode frame rate (normal)
+    0x0a, // Partial mode frame rate (normal, unused)
+  };
+  WriteData(args, sizeof(args));
+}
+
 void St7789::DisplayOn() {
   WriteCommand(static_cast<uint8_t>(Commands::DisplayOn));
 }
 
+void St7789::PowerControl() {
+  WriteCommand(static_cast<uint8_t>(Commands::PowerControl1));
+  constexpr uint8_t args[] = {
+    0xa4, // Constant
+    0x00, // Lowest possible voltages
+  };
+  WriteData(args, sizeof(args));
+
+  WriteCommand(static_cast<uint8_t>(Commands::PowerControl2));
+  // Lowest possible boost circuit clocks
+  WriteData(0xb3);
+}
+
+void St7789::GateControl() {
+  WriteCommand(static_cast<uint8_t>(Commands::GateControl));
+  // Lowest possible VGL/VGH
+  WriteData(0x00);
+}
+
 void St7789::SetAddrWindow(uint16_t x0, uint16_t y0, uint16_t x1, uint16_t y1) {
   WriteCommand(static_cast<uint8_t>(Commands::ColumnAddressSet));
-  WriteData(x0 >> 8);
-  WriteData(x0 & 0xff);
-  WriteData(x1 >> 8);
-  WriteData(x1 & 0xff);
+  uint8_t colArgs[] = {
+    static_cast<uint8_t>(x0 >> 8), // x start MSB
+    static_cast<uint8_t>(x0),      // x start LSB
+    static_cast<uint8_t>(x1 >> 8), // x end MSB
+    static_cast<uint8_t>(x1)       // x end LSB
+  };
+  WriteData(colArgs, sizeof(colArgs));
 
   WriteCommand(static_cast<uint8_t>(Commands::RowAddressSet));
-  WriteData(y0 >> 8);
-  WriteData(y0 & 0xff);
-  WriteData(y1 >> 8);
-  WriteData(y1 & 0xff);
+  uint8_t rowArgs[] = {
+    static_cast<uint8_t>(y0 >> 8), // y start MSB
+    static_cast<uint8_t>(y0),      // y start LSB
+    static_cast<uint8_t>(y1 >> 8), // y end MSB
+    static_cast<uint8_t>(y1)       // y end LSB
+  };
+  memcpy(addrWindowArgs, rowArgs, sizeof(rowArgs));
+  WriteData(addrWindowArgs, sizeof(addrWindowArgs));
 }
 
 void St7789::WriteToRam(const uint8_t* data, size_t size) {
@@ -179,8 +257,12 @@ void St7789::DisplayOff() {
 void St7789::VerticalScrollStartAddress(uint16_t line) {
   verticalScrollingStartAddress = line;
   WriteCommand(static_cast<uint8_t>(Commands::VerticalScrollStartAddress));
-  WriteData(line >> 8u);
-  WriteData(line & 0x00ffu);
+  uint8_t args[] = {
+    static_cast<uint8_t>(line >> 8), // Frame memory line pointer MSB
+    static_cast<uint8_t>(line)       // Frame memory line pointer LSB
+  };
+  memcpy(verticalScrollArgs, args, sizeof(args));
+  WriteData(verticalScrollArgs, sizeof(verticalScrollArgs));
 }
 
 void St7789::Uninit() {
@@ -202,6 +284,18 @@ void St7789::HardwareReset() {
   vTaskDelay(pdMS_TO_TICKS(125));
 }
 
+void St7789::LowPowerOn() {
+  IdleModeOn();
+  IdleFrameRateOn();
+  NRF_LOG_INFO("[LCD] Low power mode");
+}
+
+void St7789::LowPowerOff() {
+  IdleModeOff();
+  IdleFrameRateOff();
+  NRF_LOG_INFO("[LCD] Normal power mode");
+}
+
 void St7789::Sleep() {
   SleepIn();
   nrf_gpio_cfg_default(pinDataCommand);
diff --git a/src/drivers/St7789.h b/src/drivers/St7789.h
index 45d4b56d..9c778905 100644
--- a/src/drivers/St7789.h
+++ b/src/drivers/St7789.h
@@ -24,6 +24,8 @@ namespace Pinetime {
 
       void DrawBuffer(uint16_t x, uint16_t y, uint16_t width, uint16_t height, const uint8_t* data, size_t size);
 
+      void LowPowerOn();
+      void LowPowerOff();
       void Sleep();
       void Wakeup();
 
@@ -37,16 +39,25 @@ namespace Pinetime {
 
       void HardwareReset();
       void SoftwareReset();
+      void Command2Enable();
       void SleepOut();
       void EnsureSleepOutPostDelay();
       void SleepIn();
-      void ColMod();
+      void PixelFormat();
       void MemoryDataAccessControl();
       void DisplayInversionOn();
       void NormalModeOn();
       void WriteToRam(const uint8_t* data, size_t size);
+      void IdleModeOn();
+      void IdleModeOff();
+      void FrameRateNormalSet();
+      void IdleFrameRateOff();
+      void IdleFrameRateOn();
       void DisplayOn();
       void DisplayOff();
+      void PowerControl();
+      void GateControl();
+      void PorchSet();
 
       void SetAddrWindow(uint16_t x0, uint16_t y0, uint16_t x1, uint16_t y1);
       void SetVdv();
@@ -68,16 +79,26 @@ namespace Pinetime {
         MemoryDataAccessControl = 0x36,
         VerticalScrollDefinition = 0x33,
         VerticalScrollStartAddress = 0x37,
-        ColMod = 0x3a,
+        IdleModeOff = 0x38,
+        IdleModeOn = 0x39,
+        PixelFormat = 0x3a,
+        FrameRateIdle = 0xb3,
+        FrameRateNormal = 0xc6,
         VdvSet = 0xc4,
+        Command2Enable = 0xdf,
+        PowerControl1 = 0xd0,
+        PowerControl2 = 0xe8,
+        GateControl = 0xb7,
+        Porch = 0xb2,
       };
       void WriteData(uint8_t data);
       void WriteData(const uint8_t* data, size_t size);
-      void ColumnAddressSet();
 
       static constexpr uint16_t Width = 240;
       static constexpr uint16_t Height = 320;
-      void RowAddressSet();
+
+      uint8_t addrWindowArgs[4];
+      uint8_t verticalScrollArgs[2];
     };
   }
 }
diff --git a/src/main.cpp b/src/main.cpp
index ee6a6d3d..ab50fa74 100644
--- a/src/main.cpp
+++ b/src/main.cpp
@@ -123,7 +123,8 @@ Pinetime::Applications::DisplayApp displayApp(lcd,
                                               alarmController,
                                               brightnessController,
                                               touchHandler,
-                                              fs);
+                                              fs,
+                                              spiNorFlash);
 
 Pinetime::System::SystemTask systemTask(spi,
                                         spiNorFlash,
diff --git a/src/systemtask/SystemTask.cpp b/src/systemtask/SystemTask.cpp
index e3d40d35..211e19ec 100644
--- a/src/systemtask/SystemTask.cpp
+++ b/src/systemtask/SystemTask.cpp
@@ -102,7 +102,9 @@ void SystemTask::Work() {
   watchdog.Setup(7, Drivers::Watchdog::SleepBehaviour::Run, Drivers::Watchdog::HaltBehaviour::Pause);
   watchdog.Start();
   NRF_LOG_INFO("Last reset reason : %s", Pinetime::Drivers::ResetReasonToString(watchdog.GetResetReason()));
-  APP_GPIOTE_INIT(2);
+  if (!nrfx_gpiote_is_init()) {
+    nrfx_gpiote_init();
+  }
 
   spi.Init();
   spiNorFlash.Init();
@@ -192,13 +194,16 @@ void SystemTask::Work() {
           if (!bleController.IsFirmwareUpdating()) {
             doNotGoToSleep = false;
           }
-          displayApp.PushMessage(Pinetime::Applications::Display::Messages::RestoreBrightness);
+          displayApp.PushMessage(Pinetime::Applications::Display::Messages::NotifyDeviceActivity);
           break;
         case Messages::DisableSleeping:
           doNotGoToSleep = true;
           break;
         case Messages::GoToRunning:
-          spi.Wakeup();
+          // SPI doesn't go to sleep for always on mode
+          if (!settingsController.GetAlwaysOnDisplay()) {
+            spi.Wakeup();
+          }
 
           // Double Tap needs the touch screen to be in normal mode
           if (!settingsController.isWakeUpModeOn(Pinetime::Controllers::Settings::WakeUpMode::DoubleTap)) {
@@ -240,7 +245,7 @@ void SystemTask::Work() {
           heartRateApp.PushMessage(Pinetime::Applications::HeartRateTask::Messages::GoToSleep);
           break;
         case Messages::OnNewTime:
-          displayApp.PushMessage(Pinetime::Applications::Display::Messages::RestoreBrightness);
+          displayApp.PushMessage(Pinetime::Applications::Display::Messages::NotifyDeviceActivity);
           displayApp.PushMessage(Pinetime::Applications::Display::Messages::UpdateDateTime);
           if (alarmController.State() == Controllers::AlarmController::AlarmState::Set) {
             alarmController.ScheduleAlarm();
@@ -251,7 +256,7 @@ void SystemTask::Work() {
             if (state == SystemTaskState::Sleeping) {
               GoToRunning();
             } else {
-              displayApp.PushMessage(Pinetime::Applications::Display::Messages::RestoreBrightness);
+              displayApp.PushMessage(Pinetime::Applications::Display::Messages::NotifyDeviceActivity);
             }
             displayApp.PushMessage(Pinetime::Applications::Display::Messages::NewNotification);
           }
@@ -263,7 +268,7 @@ void SystemTask::Work() {
           displayApp.PushMessage(Pinetime::Applications::Display::Messages::AlarmTriggered);
           break;
         case Messages::BleConnected:
-          displayApp.PushMessage(Pinetime::Applications::Display::Messages::RestoreBrightness);
+          displayApp.PushMessage(Pinetime::Applications::Display::Messages::NotifyDeviceActivity);
           isBleDiscoveryTimerRunning = true;
           bleDiscoveryTimer = 5;
           break;
@@ -323,7 +328,11 @@ void SystemTask::Work() {
             // if it's in sleep mode. Avoid bricked device by disabling sleep mode on these versions.
             spiNorFlash.Sleep();
           }
-          spi.Sleep();
+
+          // Must keep SPI awake when still updating the display for always on
+          if (!settingsController.GetAlwaysOnDisplay()) {
+            spi.Sleep();
+          }
 
           // Double Tap needs the touch screen to be in normal mode
           if (!settingsController.isWakeUpModeOn(Pinetime::Controllers::Settings::WakeUpMode::DoubleTap)) {
@@ -410,8 +419,6 @@ void SystemTask::Work() {
     }
 
     monitor.Process();
-    uint32_t systick_counter = nrf_rtc_counter_get(portNRF_RTC_REG);
-    dateTimeController.UpdateTime(systick_counter);
     NoInit_BackUpTime = dateTimeController.CurrentDateTime();
     if (nrf_gpio_pin_read(PinMap::Button) == 0) {
       watchdog.Reload();
@@ -459,7 +466,7 @@ void SystemTask::HandleButtonAction(Controllers::ButtonActions action) {
     return;
   }
 
-  displayApp.PushMessage(Pinetime::Applications::Display::Messages::RestoreBrightness);
+  displayApp.PushMessage(Pinetime::Applications::Display::Messages::NotifyDeviceActivity);
 
   using Actions = Controllers::ButtonActions;