Hi
I had the same problem with my Laptop, i managed it, by adding the resolution to the X11 config file.
open the xorg.conf in a texteditor as root.
sudo gedit /etc/X11/xorg.conf
Now look for the section "Screen", i guess the list of resolutions will catch your eyes, you can't miss it.
Now easily add the Resolution you need. This may look like this.
Code:
SubSection "Display"
Depth 24
Modes "1280x800" "1024x768" "800x600" "640x480"
EndSubSection
Now execute the
nvidia-settings, switch to the "X Server Display Configuraion" panel, choose your new resolution and confirm by pressing Apply.
now have a lot of fun
Regards
Sponge