The video projector I have to use this week projects an image too large for its screen
and spills over on every side.
Fixing the physical setup is not possible or at least unlikely for the moment: the only solution is to carefully resize and position windows so that they display in the visible part of the screen - using full-screen mode is out.
Is there a way around this via software, using xrandr for example?
# xrandr doesn't have a padding option... xrandr --output VGA1 --mode 1360x768 --left-of LVDS1 --padding 200