I'm an Nvidia GT 440 user. I can already click on the 1280x1024 option in monitors but as shown in the image below it outputs an error. The message says:The virtual size required doesn't fit the available one,plus it says the maximum size is 1024x768 I tried many things and i ended thinking that the problem could probably be the EDID info,so I installed the package read-edid. When i type
sudo get-edid | parse-edid
it prints this http://pastebin.com/GSnaJDnn
If more explanation is needed I'll post it as fast as i can
sudo lshw -numeric -c video,lsmod,xrandr -q. In particular I'm wondering what driver is being used in your system to run your graphics. – John S Gruber Sep 13 '12 at 15:24