Ubuntu 9.10 och Nvidia problem

1. Backup your xorg.conf file, using the following command – sudo cp /etc/X11/xorg.conf /etc/X11/xorg.conf.backup
2. Delete the current xorg.conf – sudo rm /etc/X11/xorg.conf
3. Create a new xorg.conf file – sudo nvidia-xconfig
4. Restart X, by logging out, then logging back in. The resolution won’t be fixed yet though.
5. Open up the Nvidia-settings – gksudo nvidia-settings
6. Make the changes to set your resolution to its correct settings , hit ‘Apply’, and then ‘Save to X configuration file’.

From: http://ubuntuforums.org/showthread.php?t=1311261

I hope it works for you aswell!
//Thom