I'm running Ubuntu 10.10 and a GeForce 8400 GS GPU with the Nvidia package.
My monitor is a Dell 2001FP and lists its native resolution as 1600 * 1200. I can only achieve 1152 * 864. Same issue with Fedora. In Win XP/Vista the resolution is achieved.
I've unsuccessfully edited the xorg.conf in the past with details that seem appropriate for the monitor and have had little results.
Any suggestions? Granted this is pretty old hardware and I'm doubtful others will still be using a similar set-up.