Sounds like his user account has a virtual screen size specified somewhere. Very odd.
I can tell you a quick work-around until you can find the cause:
If you can press Alt-F2, try entering the following command in the pop-up Run Application window (I'm assuming your monitor is VGA-0. If not, replace accordingly, e.g. LVDS, CRT-0 or whatever) to change the resolution in the current session to what you want (I'm assuming your monitor resolution is 1680x1050. If not, replace accordingly):
- Code: Select all
xrandr --output VGA-0 --mode 1680x1050
To make that stick over reboots, you can create a Desktop Configuration File in ~/.config/autostart/ (see e.g. How To: Add startup programs in GNOME 3
If you can't enter the command on the user's Desktop via Alt-F2, press Ctrl-Alt-F1 to get to a VT, log in as the user, and create the above-mentioned Desktop Configuration File using the nano editor.