[ubuntu] resolution problem with nvidia 9800gt

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http://ubuntuforums.org – hello everybody!! :P i've got a problem: i installed ubuntu 11.10 on my pc, but i can't set the resolution up to 1280x1024... the maximum value i can get with the nvidia driver is 1024x768 and 768x680 without the driver i tried to edit the file xorg.conf, and also to use the command xrandr... what can i try now?? can you help me?? thanks (Hardware)