It is also happening on Precise Pangolin, 12.04, beta.
I found the issue after screen becomes blank or after user switch. I saw it 
only on Unity, never on XFCE, despite using composite on both. I didn't tried 
on Gnome 3.
Today i found it happening on Firefox after Firefox was grayed due to becoming 
unresponsive (too high memory usage); then the webpage characters became 
corrupted, a refresh of the webpage seems to fix it, and the background behind 
was 'pixelated'.
Using Intel Video Chipset on a desktop board:
VGA compatible controller: Intel Corporation 82945G/GZ Integrated Graphics 
Controller .

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https://bugs.launchpad.net/bugs/776736

Title:
  font corruption in firefox and gnome-terminal after suspend

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