Maybe also of interest.
Before a crash occurs, some windows which are open on different workspaces, 
e.g. gedit and firefox 
the focused one and there only a part of the window gets some kind of overlay 
pattern (similar to matrix screenshot), so one can see only part of the window.
e.g. in gedit half of the window is overlayed by the pattern, firefox menu is 
overlayed, but webpage is visible. Sometimes the pattern is black-grey, 
sometimes black-green.

When moving to another workspace via ctrl+alt+arrow the pattern disappears.
When I try to make a screenshot of the overlayed window via alt+print the 
pattern disappears.

** Attachment added: "matrix.png"
   
https://bugs.launchpad.net/ubuntu/+source/xorg/+bug/677159/+attachment/1738647/+files/matrix.png

-- 
[Lucid] Xserver fallback to GDM: ddxSigGiveUp
https://bugs.launchpad.net/bugs/677159
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