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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
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The best I could come up with was

  • use XMonad and a virtual machine: resize the VM window to fit the visible area of the display (no window decorations to get in the way) and then display the presentation full-screen in the VM

  • use xrandr's fb option to limit the total screen size to the visible area and the transform option to move it to the right place. Like this the other display is pretty useless.

    xrandr --fb 1000x600 --output VGA1 --mode 1360x768 --transform 1,0,-150,0,1,-80,0,0,1

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