[ubuntu] How to fix low resolution with xorg.conf

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http://ubuntuforums.org – I just got my dual screen set up in ubuntu using an nvidia GeForce 8400 GS video card. The nice thing is that it worked as an extended desktop right away. But the resolutions available are wrong. They are not as high as the monitor can go (1440x900), and they are not the right aspect ratio either. I didn't have any luck adding new modes with xrandr commands. It would refuse them as if my hardware wouldn't support modelines for higher res. Anyway, I'd rather achieve this by editing xorg.conf so the change will persist. I've tried about a dozen permutations of xorg.conf files based o (Hardware)