This malfunction of drivers can happen due to multiple reasons, like another device driver was installed and some display driver got corrupted, your existing drivers have gotten outdated, etc.
When brightness control stops working on your computer, then usually this problem is associated with monitor driver and display driver malfunction. Causes Behind Brightness Control Problems Therefore, in this guide, we will explain in detail how to fix Windows 10 brightness control not working problem. However, when your Windows 10 brightness control stops working then it can be really annoying, especially if you have a habit of tinkering with brightness settings. The ability to adjust the screen brightness is an important feature that allows you to get the best view of your monitor screen based on the environment and in case of laptops, it’s also helpful in saving battery usage.