When I've launched the game for the 1st time, during the ID Software's video, the brightness shut down suddenly.
So I've put the brightness up in my settings, but if I launch the game again : the brightness shut down again, it's pretty bad to change my brightness each time I want to play...
Also, I've a problem with my mouse sensitivity : she's decreasing... and I have to do 3cm for do a little distance, (about 10/15pxl) or a big movement for make it increase, and this is starting again... I don't know if I'm comprehensible : It's like the opposite of "mouse acceleration", mouse "deceleration" ?
This is strange... =/ And this problem doesn't happen when I'm playing, it's just for the menu.
The mouse that I use is a G9 (logitech) (a friend gave me it).
I searched with the tool but I didn't find the solution for my 2 problems... =/