The problem is that the gamma gets dark randomly (like every minute or two) and you have to change your gamma to any value, then set it back to where it was (for example, if I use r_gamma 1.2, I change it to 1.21, then back to 1.2). Why is the laptop doing this?

It happens too with ezquake.exe. Not sure if it happens with all games, i've only tried QW, Q3 and QL.

My Laptop is an Asus N53SV

It's happening during gameplay so it has anything to do with screensavers and stuff.

nVidia graphics are updated.

Hope you can drop some help.