Any brightness issue occurring on your computer may be associated with your computer’s display driver or incorrect settings. If your Windows cannot adjust the brightness of your computer or laptop display, then restarting the PC or updating the Windows should be your first course of action. If the issue still persists, then you have to try some other workarounds. In this article, we will teach you how you can fix the issue Brightness Not Working or Slider Missing in Windows 10 operating system. How to Fix Brightness Not Working or Slider Missing in Windows 10 In this article we will show you five straightforward methods to fix the issue Brightness Not Working or Slider Missing in Windows 10 operating system: · Updating Display Adapter drivers · Turn Adaptive Brightness · Turn on PnP Monitor · Updating Registry 1) Updating Display Adapter drivers Here are the steps on how to update Display Adapter drivers: 1. Right-tap on Start and then tap on “Device manager.” 2...