With that, restart your PC and follow the same method to lead to the Device Manager and check whether the drivers are back again and whether you could find the missing brightness slider.
From the toolbar on the top, choose the Scan for Hardware Changes option to detect and install the required drivers automatically. 
Under Display Adapter, choose the primary display adapter, right-click, and choose Uninstall Device. Reinstalling the drivers or moving back to an older version could help in that scenario. Sometimes, brands may push out a buggy update out of nowhere for your monitor or graphic cards. With that, restart our PC once and check whether the missing brightness slider is back, else continue to follow other methods mentioned below. Under the Device Manager, navigate and expand Monitors and from the list of monitors available, choose your primary monitor, right-click and choose Enable Device. Open the Device Manager by searching for the same using the Start Search Box and choosing the main listed result. Related Read: How to automatically adjust brightness in Windows 1] Enable Monitors Drivers using Device ManagerĪ disabled monitor driver could be the main issue behind Windows not showing up the brightness slider. Here’s the list of methods we will be following in order to get the brightness slider fixed: The brightness slider on Windows 10 could be missing or greyed out due to various reasons, either due to a graphics driver problem or maybe a bug with the latest version of Windows. Fix Brightness Control Missing Can’t Adjust Brightness in Windows 10 In this post, we will share the measures you can take to fix the brightness control issue. It is available as a slider in the Action Center but in case it is missing, then you cannot adjust brightness in Windows 10. 
Brightness Control is an important tool that makes sure you can adjust for the best viewing experience.
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