Confirming.  Laptop with Intel GM965, Gutsy.  Plugging/unplugging an
external monitor and resizing the desktop with xrandr confuses compiz.
For example, if I extend my 1280x800 desktop to 1280x1824 with xrandr
--output VGA --auto --above LVDS, my LCD screen becomes completely blank
(except for the mouse cursor), the topmost 800 pixels of the VGA screen
are correct, and the bottommost 224 pixels of the VGA screen contain
garbage.

As a workaround I use Alt-F2, "compiz --replace", Enter to restart
compiz.

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black screen after resolution change with activated compiz
https://bugs.launchpad.net/bugs/135418
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