Brightness control doesn’t work and is stuck at max level at any position of the brightness slider in the settings. Some users are faced with the fact that after updating to the latest Windows 10 build (1803 April Update) they can’t change the screen brightness on many laptop models. Unable to Adjust Screen Brightness after WindApril Update
Switching to the Microsoft Basic Display Adapter Driver.Fix Screen Brightness Control Bug Using KMD_EnableBrightnessInterface2.Unable to Adjust Screen Brightness after WindApril Update.