Volume, Brightness, play buttons not working on XPS 13
The controls (volume, brightness, keyboard brightness, etc) on the F1-F12 buttons are not working. This is probably a setting issue but my XPS 13 is new and I haven't done much with it except let my kids play with it. If I want to adjust volume, I have to manually open up the program to adjust it. It is just getting annoying. Please help.