Method 2: Update the Graphics Driver to Fix Brightness Not Working in Windows 10 Expand Enable Adaptive Brightness and set it to Off.
In the Power Options dialog, locate the Display entry and expand it. Under Choose or customize a power plan, click Change plan settings. Right-click the Start button and click Control Panel. If the screen brightness is not working in Windows 10, you could try to disable the option Adaptive Brightness.
Here is a guide on how to fix the brightness control not working problem in Windows 10 (Creators Update/Fall Creators Update 1709), applied to HP, Asus, Dell, Lenovo, Toshiba, Lenovo, MSI, Samsung and other brand PCs. They can't increase or decrease the screen brightness. Recently, a lot of users reported the brightness not working issue in Windows 10.
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