Hello,
here some tips which may help you :
1. You can update your driver with Windows Update
2. Update or reinstall the display driver: An outdated or corrupt display driver can cause issues with the screen brightness. Go to the Device Manager, expand the Display adapters section, right-click on your display driver, and select "Update driver" or "Uninstall device" and then "Scan for hardware changes" to reinstall the driver.
3. Run the hardware troubleshooter: Windows has a built-in troubleshooter that can detect and fix issues with the hardware. Go to the Control Panel > Troubleshooting > Hardware and Sound > Power and run the troubleshooter.