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During the past 3 days I have experienced the following issue: when returning from sleep, I see an extremely garbled version of my desktop. The only thing that seems to help is a reboot.

My first guess is that this is related to the video card. After looking into this issue, I found a lot of problems related to ML and returning from sleep, such as this post on AskDifferent, but I think this is a different issue because it does not speak of a garbled screen.

Some more details:

  • System: MacBook Pro 15" early 2011, 2,2GHZ I7, 8GB Ram, AMD Radeon HD6750M 1024
  • The issue seems to happen only when I open my laptop in the morning; if I close and open my laptop during the day, it does not seem to happen.
  • The issue 'solves' when rebooting.

Photo of how this looks:

Photograph of a 2011 MacBook Pro with a garbled screen

Update November 27th 2012:

I re-installed my laptop a couple of weeks ago, which seemed to have solved the problem, but sadly, it still persists.

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I'm experiencing this issue as well. The exact same pattern on the screen. Mine seems to happen after disconnecting from a thunderbolt display. –  cpatrick Nov 15 '12 at 2:29
    
I 'solved' this issue by doing a clean install of Mountain Lion. I won't add this as an answer through, since it does not actually explain the issue. –  Aron Rotteveel Nov 15 '12 at 8:15
    
@cpatrick sadly, I am once again getting the crashes now. Have you have had any luck? –  Aron Rotteveel Nov 27 '12 at 10:41
    
I haven't seen it for a while, but I didn't do anything to fix it. :( –  cpatrick Nov 28 '12 at 17:43

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