The display driver is very important software that ensures how your display settings will interact with the particular hardware like your monitor.
And restart your PC to apply these updates and check if there is no problem with Brightness control.Īs discussed before If your display adapter driver is outdated or incompatible with your computer, then you might face a problem with controlling the system’s brightness. 
Hit check for updates button to allow Windows updates download and install from Microsoft server,. Click update & security the Windows update,. Press keyboard shortcut Windows + I to open the Settings app,. If the brightness adjustment issue occurs immediately after upgrading to Windows 10 20H2, we recommend to check for and install the latest Windows updates that probably help to fix this problem. Lenovo – Hotkey Features Integration for Windows 10 or AIO Hotkey Utility Driver. 
HP – HP Software Framework and HP Hotkey Support. Pro Tip: If you found that adjusting the brightness in Windows 10 settings works fine, but the function keys (Fn) of brightness control on the laptop keyboard doesn’t work, most likely you need to install additional software from the laptop manufacturer.
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