The background agent may be responsible for remapping keys and physical buttons. In the Services box, locate Human Interface Device Service. This should cause the volume key to function again. If there’s a delay between pressing a key and the character showing up on your screen, you need to adjust Filter Keys. I use a laptop, so an option of a new keyboard is out of question. The top row of the keyboard which includes the brightness and volume keys isn't working. You may need to change the Profile or settings in the Power Management settings of the host PC’s Operating System.
