I have a late 2011 Macbook pro, and lately it hasn't been sleeping properly. If I close the lid for less than a minute and reopen it, it doesn't go to sleep while the lid is closed. The screen is still displayed immediately after reopening. Also, a few seconds after I open the machine, it will go to sleep on it's own. I have had the software checked and that doesn't seem to be the problem. What could be causing this and how do I get it fixed? It is still under warranty.
Macbook sleep is delayed
hardwaremacbook prosleep-wake
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Best Answer
If there is a process that is preventing sleep (rather than a bug in the sleep implementation), you can use "pmset -g" in a terminal window to list the process that is doing that. This is covered over on superuser.
Here is an an example on my system. First, with nothing preventing sleep:
Then I start music in iTunes: