How to fix brightness button not working Windows 11

If the brightness setting in Windows 11 doesn’t work – neither by using the button in the notification area, nor by adjusting the screen settings, nor by using the dimmer and boost buttons – we’ll tell you how to fix it.

Universal PnP monitor” is disabled:

• Start the Device Manager.
• Under ‘Monitors’, look for ‘Universal PnP monitor’.
• If you see a small arrow next to the icon, the device is disabled.
• Right-click on it and select “Enable”.
• Reboot the computer.

Video card drivers:

• Install the official drivers manually by uninstalling the old ones.
• If your computer has a discrete video card and integrated video from Intel, also install the latest drivers from the manufacturer.
• Check if the video adapter is disabled in Device Manager.