![]() There is also another option used to reduce the brightness of the display if the device is running on battery ( Help improve battery by optimizing the content shown and brightness). You can enable/disable adaptive display brightness from the System -> Brightness -> Change brightness automatically when lighting changes. ![]() The brightness of the screen is set according to the ambient light (adaptive brightness). Windows can use your laptop’s light sensors (available on almost all modern tablets and laptops) to adjust the screen brightness. "FeatureTestControl"=dword:0000f008 Check Windows Adaptive Brightness Settings You can enable screen brightness control in Windows by using the KMD_EnableBrightnessInterface2 registry parameter under the reg key HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\Control\Class\\0002] Enable Screen Brightness Control with Registry Tweak Try changing the brightness using the laptop Fn keys.
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