

Restart windows and check This will fix “can’t adjust brightness ” bug. ” What do I do if my brightness isn’t adjusted? If the problem started after install windows 10 version 1803, them make sure you have installed latest Cumulative Update KB284835, As Microsoft mention: “ Addresses an issue with the brightness controls on some laptops after updating to the Windows 10 April 2018 Update. Under settings, the display setting provides no adjustment for brightness. Why is the brightness not working on my Windows 10 laptop?

