A lot of Windows laptops now come with a light sensor that automatically adjust the screen’s brightness based on the surrounding lightings. If it’s dark, it dims your screen to save more energy and protect your eyes. And if it’s brighter, it brightens the screen accordingly so you can actually see what’s on the screen.
The feature has a universal term called Adaptive Brightness, and can be really useful and healthy to both your eyes and your laptop’s battery. But, it also can be quite annoying sometimes too, especially when you are watching movies on your laptop during the night. It really can frustrate you.
If that’s the case, here is how you can disable the Adaptive Brightness on both Windows 10 and 8.1 computers.
Go to Control Panel → Hardware and Sound and open Power Options.
Click Change plan settings on whichever plan currently selected to open Edit Plan Settings window.
Then click Change advanced power settings, which opens up Advanced settings window. Expand Display option, and under Enable adaptive brightness, turn it off on both the battery and plugged in modes.
That’s about it. Note that the Adaptive Brightness is available on both Windows 8.1 and Windows 10 computers but will only be visible if your device is equipped with the light sensors.