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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: How to stop MacBook Pro (Retina) from freezing/locking at the login/authentication dialogue, after wake? 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

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This also occurs on my MBP 15" with Intel HD Graphics 3000. Usually after having used external screen at the office. – user38162 Jan 8 at 19:24
@user38162 I have detected a pattern involving external monitors as well. If I connect my laptop to my external monitor before the laptop screen is turned on, this usually happens. If I wait for the laptop screen to turn on, and then connect my external monitor, the problem does not occur. – Aron Rotteveel Jan 8 at 22:08

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