When I first booted into Ubuntu the resolution was correctly set at the native 1920x1200 (iMac 24" Late 2006, GeForce 7600 GT). Now, however, the resolution is stuck at 1280x1024 and nothing higher than that appears in preferences. What I have tried:
- install the Nvidia driver.
- apt-get upgrade
- Set the resolution in Terminal. ("Size 1920x1200 not found in available modes")