Hi, I have a HP pavilion dv6 3010us. I could increase or decrease my screen brightness but now i cant. I also recently updated my graphics card. Could that be the problem?
try booting into safe mode f8 and see if the f key works and your screen gets brighter. if it does not...then it sounds like the back light or the inverter is going.
video drivers dont control most time the back light on a lcd screen.