At work, I’ve got an AOC LM2028 monitor, which is supposed to do a resolution of 1600x1200. However, using it with a nVidia card, it consistently only shows up with 1280x1024. The solution is very simple, and took me two hours to find:
Option "ModeValidation" "NoDFPNativeResolutionCheck"
Added to the “Device” section.
… many thanks!
… many thanks!