This looks like a possible bug in the intel driver, can you all confirm you are 
using the intel Xorg driver
and which version you have by running:

  dpkg -l xserver-xorg-video-intel|grep ^ii|awk {'print $2" "$3'}

in a terminal and copy the output to a comment here?

My output from the dpkg command:
xserver-xorg-video-intel 2:2.4.1-1ubuntu2

-- 
[intrepid] gnome-screensaver + compiz makes Xorg freeze?
https://bugs.launchpad.net/bugs/264953
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