Public bug reported:

I run Ubuntu 11.10 on a Dell desktop with a dual use video card that
goes into two monitors. They normally work great and I have no
complaints. When I first upgraded to 11.10, I would occasionally have
both monitors randomly black out, and I'd have to restart the computer
to get them back. Though that problem seemed to go away, and I wrote it
off to package upgrades that fixed a bug.

Then, after upgraded unity and a bunch of other packages today it
started it again. Three times I've had it black out this morning. I
don't know why. Though I often use hotkeys to slide between workspaces,
and one of the blackouts happened during a slide.

** Affects: unity (Ubuntu)
     Importance: Undecided
         Status: New

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https://bugs.launchpad.net/bugs/882710

Title:
  Dual monitors randomly black out, might be linked to switching
  workspaces

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