Installed win 8.1 using bootcamp and can't change brightness

[vmflapem]

When i boot windows 8.1, the screen is at its maximum brightness (and of course the ambient light sensing doesn't work)
I can't lower the brightness using the F1 key. I even disabled the monitor thing from the Device Manager but nothing seems to work.

Anyone have any ideas how i can fix this?

 

[simon48]

Did you install the Boot Camp drivers? You also might not have the function keys set to do what's printed on them, in the Boot Camp control panel you can change this. Also try hitting fn + F1.