iMac goes to Deep Sleep over night. Why?

Question

Level 1

11 points

iMac goes to Deep Sleep over night. Why?

Hi,

I bought a new iMac few weeks ago. It's 21" basic configuration, late 2012. Now it suddenly started to go to Deep Sleep over night - I put it to normal Sleep Mode in the evening but every morning I see the progress bar down there and it takes much longer time than usual wake up. I might have changed something but I don't know what. 2 days ago it was alright. Can you please tell me what caused this and how can I put it back.

Thanks very much in advance.

Best Regards

Milan

iMac, OS X Mountain Lion (10.8.3)

Posted on Mar 29, 2013 11:14 PM

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Answer 1

Eric Ross

Level 6

11,807 points

Mar 30, 2013 12:17 AM in response to milanprokop

It is possible that the iMac's hard drive is going to sleep after an hour, check your energy saver section in your system preferences.

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Answer 2

Linc Davis

Level 10

209,547 points

Mar 30, 2013 6:14 AM in response to milanprokop

Your warranty includes 90 days of phone support. Call AppleCare.

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Answer 3

milanprokop Author

Level 1

11 points

Mar 30, 2013 8:19 AM in response to milanprokop

I'll try to contact the authorised service provider. I don't think it's the hard drive sleep, I always used this feature and it has never been a problem.

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Answer 4

milanprokop Author

Level 1

11 points

Mar 30, 2013 12:31 PM in response to milanprokop

I've just found out what is it. This is from: http://support.apple.com/kb/HT1757

"With the release of the OS X Mountain Lion v10.8.2 supplemental update 2.0, a new feature was introduced to enter safe sleep after four hours of the computer being connected to AC power. This is an effort to comply with the European Energy Standards (ErP Lot6). This will only occur if there is no wireless or Ethernet activity and no activity from external devices such as USB storage devices."

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Answer 5

Eric Ross

Level 6

11,807 points

Mar 30, 2013 12:48 PM in response to milanprokop

Thanks for the update, good information.

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Answer 6

n748

Level 1

34 points

Apr 1, 2013 11:19 AM in response to milanprokop

Take a look at the discussion here. There are a couple of posts (like this) explaining a procedure to circumvene the issue:

Go to Terminal and enter: sudo pmset -a autopoweroff 0

To undo type: sudo pmset -a autopoweroff 1

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Answer 7

milanprokop Author

Level 1

11 points

Apr 2, 2013 1:52 PM in response to n748

autopoweroff, standby, autopoweroffdelay nor standbydelay didn't make a difference for me, the computer always goes to Safe Sleep over night. I'm kinda frustrated form it cause whatever I try it's always the same. It sad that some of these settings (like autopoweroff) are not even described in man pages. :/

Furthermore they say "standby only works if hibernation is turned on to hibernatemode 3 or 25." and "standby causes kernel power management to automatically hibernate a machine after it has slept for a specified time period." So how come that my iMac hibernates when I have hibernate mode set to 0 and the "specified time period" is set to 24 hours???

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Answer 8

Jun 8, 2013 7:19 AM in response to n748

Does

not

work

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