I also have NVidea card and 9.10 of Kubuntu & Ubuntu (duo boot) and they both
gave resolutions up tp 1280x... after the installation. That was UNTIL I
installed the NVidea driver. That's when the problem starts; highest resolution
becomes 1024x. I can use the NVidea util to change the resolution but it is lost
when rebooted.

In previous versions of Kubuntu, I did modify xorg.conf but this doesn't work
with 9.10. The nVidea util, even under sudo, fails to save changes.

BTW, I'm using the oldest NVidea driver; x96 due to the age of my card/computer.