Q: Mac sometimes freezes when waking up from sleep

My Mid-2012 MacBook Pro sometimes freezes when I wake it up from sleep. It shows the lock screen, but before I'm able to enter my password, it freezes. I am left with no option but to press and hold the power button to force it to shut down.

I checked the Console log and saw a long of list of messages saying the same thing (at the time the computer froze):

WindowServer[663]: GPU Driver appears to be hung (over 5 continuous seconds of unreadiness)

The computer runs fine otherwise. This problem occurs only when waking up from sleep, and that too rarely. I haven't been able to find a pattern. The problem seems to have started after upgrading to OS X El Capitan, but I don't know if it's related.

Also, it passed the extended Apple Hardware Test.

Can anyone help, please?

MacBook Pro (13-inch Mid 2012), OS X El Capitan (10.11.5)

Posted on Jun 3, 2016 8:32 AM

I have this question too

Q: Mac sometimes freezes when waking up from sleep

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by sanjampet,

sanjampet Jun 3, 2016 9:06 AM in response to g24896
Level 5 (7,874 points)

Jun 3, 2016 9:06 AM in response to g24896

g24896,

Some things to try.
SMC Reset
http://support.apple.com/kb/HT3964

Safe Boot:
Power off the Mac, Restart, hold the SHIFT key till you see the progress bar then you can release and allow to finish booting. Note this will take longer than usual. after the boot completes, shut down, this will take longer as well, then restart normally.
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by g24896,

g24896 Jun 4, 2016 8:41 AM in response to sanjampet
Level 1 (8 points)

Notebooks

Jun 4, 2016 8:41 AM in response to sanjampet

Thanks for the reply!

I reset the SMC. Since the problem is so infrequent, I can't say whether it helped or not. I'll just have to wait and see, I guess.
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Q: Mac sometimes freezes when waking up from sleep

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by sanjampet,

by g24896,

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