Run the Hardware and Devices Troubleshooter.Uninstall & reinstall the graphics card driver.
If Surface Book, Laptop or Pro Brightness buttons are not working as expected, then try the following suggestions: Surface Brightness buttons are not working Now, it is our belief this problem has everything to do with the driver, therefore, we will focus on the main fixes first, and then some secondary ones if it fails to work. You see, the indicator comes up showing the brightness level is increasing and decreasing, but it is not actually happening. Apparently, the brightness keys are not working when pressed (F1 and F2). A few days ago, we came across a situation where some users are having problems with the brightness keys on the Surface device. However, problems do pop up now and again. The Microsoft Surface range of devices is impressive and it’s a clear sign that Microsoft knows how to create really good laptops that can compete with bigger players on the market.
