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Why does MBP go to sleep when processes are unfinished?

214 Views 3 Replies Latest reply: Sep 9, 2012 2:38 AM by mrbofus RSS
Jeffrey Shaw Calculating status...
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Sep 1, 2012 2:55 PM

I have a MBP Retina with Mountain Lion 10.8.1. I am finding that Mac goes to sleep even when it is mid-task. For example, I have a video encode which is going to take a couple of hours so I think it is OK to leave the process running and go off out, but I come back several hours later to find that the machine has gone to sleep without completing the task - 90 minutes still to go. This is happening all the time. I could set Energy Preferences to sleep 'never', but where then is the concept of sleeping? I have never seen this behavious before - surely we expect the computer to only sleep when it is IDLE?

MacBook Pro with Retina display, OS X Mountain Lion (10.8.1), Thunderbolt Display

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