Can't output 1680x1050 to DVI monitor via HDMI port

[info at vtnd.de (Oliver Seitz)]

> $ xrandr --output HDMI1 --mode 1680x1050
>
> Will set the display mode properly, but the gnome menu bar (normally on the
> bottom) appears in the middle of the screen and logging of reverts back

This is a gnome thing, then. Try switching off VGA completly, gnome 
might then adopt to the higher resolution.

Greets,
Kiste