Skip navigation

Sleep Mode

956 Views 7 Replies Latest reply: Apr 4, 2014 3:11 PM by William Spragens RSS
ronenhaim Level 1 Level 1 (10 points)
Currently Being Moderated
Nov 27, 2012 11:36 AM

I have an iMac 21.7 MID 2011 with  Mountain Lion 10.8.2.

Is there a difference between 2 Sleep  mods :


1. On System Preferences - Energy Saver - Computer Sleep - See Pic 1

2. On Sleep mode under Apple Menu , See Pic 2






What is the recomend preferences in Energy Saver modes ?





Pic 1


Screen Shot 2012-11-27 at 9.00.33 PM.png

Pic 2

Screen Shot 2012-11-27 at 9.02.30 PM.png

iMac, OS X Mountain Lion, 10.8.2
  • Paul_31 Level 6 Level 6 (12,220 points)
    Currently Being Moderated
    Nov 27, 2012 12:19 PM (in response to ronenhaim)

    Selecting sleep under the Apple menu triggers the settings you have in Energy Saver Preferences. In other words, it activates sleep immediately when selected.

    I don't think there is a recommended preference setting - here are mine:

    Computer sleep: 1 hour

    Display sleep: 10 mins

    Put hard disks to sleep when possible - selected

    Wake for network access - selected

    Allow power button to put the computer sleep - selected

    Start up automatically after a power failure - not selected.


    However, if you asked ten different users what their settings are you would probably get eleven different answers .

  • Paul_31 Level 6 Level 6 (12,220 points)
    Currently Being Moderated
    Nov 28, 2012 6:30 AM (in response to ronenhaim)

    You're welcome!

  • sandysanderson Calculating status...
    Currently Being Moderated
    Jan 24, 2013 7:41 AM (in response to Paul_31)

    Hi Paul_31,

    I recently discovered that there is a physical difference between the 2 sleep modes with my late 2009, 21.5" imac running OS X 10.8.2. It stays warm when in sleep triggered by energy saver but cools right down to ambient temperature when put to sleep from the sleep command in the apple menu.


    Any ideas why this should be?

  • Paul_31 Level 6 Level 6 (12,220 points)
    Currently Being Moderated
    Jan 24, 2013 9:33 AM (in response to sandysanderson)

    Hi - interesting, but I have no idea as to why

  • sandysanderson Level 1 Level 1 (0 points)
    Currently Being Moderated
    Jan 24, 2013 3:42 PM (in response to Paul_31)

    Interesting indeed. I'll try to get to the bottom of this and report back.

  • William Spragens Level 2 Level 2 (200 points)
    Currently Being Moderated
    Apr 4, 2014 3:11 PM (in response to sandysanderson)

    There are 2 sleep modes. One is when the power saver time is past. The HD is shut down and video is turned off, and the CPU slows down, but CPU and RAM are left running for an instant restart.


    Then there is deep sleep initated by the user either from the Apple Menu or by hitting command-option-eject on the keyboard. In this case, RAM and all system caches are saved to disk, and then the Mac is powered down, leaving only the Power Management Unit alive. This is almost like Shut Down, except when awakened the state of RAM etc. is reloaded from disk instead of doing a system boot. Waking is pretty fast, but slower than light sleep.


    If a laptop on battery power is left long enough, it will go from sleep to deep sleep to save battery. You'll notice it takes longer to enter deep sleep because of writing everything to disk.


More Like This

  • Retrieving data ...

Bookmarked By (0)


  • This solved my question - 10 points
  • This helped me - 5 points
This site contains user submitted content, comments and opinions and is for informational purposes only. Apple disclaims any and all liability for the acts, omissions and conduct of any third parties in connection with or related to your use of the site. All postings and use of the content on this site are subject to the Apple Support Communities Terms of Use.