full screen games can't set screen resolution

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https://bbs.archlinux.org – hello ,,when I start games like doom 3 or quake 4 the game appears in just small part of the screen and when I close it with pkill the screen resolution stays in game resolution, I mean like 800x600 and the reset of space is just black.my video card is nvidia GeForce 9500 GT, X version is: X.Org X Server (1.12.4 RC 1), and I use kde 4.9.0, kernel version is 3.4.9-1-ARCH mustafa https://bbs.archlinux.org/profile.php?id=29604 2012-09-07T16:16:14Z (HowTos)