I can confirm the bug ... i have the same randomly
It seems to be caused by fbc (framebuffer compression) 

My card is a 945gm.

Here is the diff between two Xorg.log, one when the problem occurs, the
other when it doesn't.

Tell me if you need more information as above.


** Attachment added: "log.diff"
   http://launchpadlibrarian.net/12828290/log.diff

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black screen randomly (hardy heron)
https://bugs.launchpad.net/bugs/205019
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