Why I've re-enabled the SleepImage on my '13 MBA

Discussion in 'MacBook Air' started by RightMACatU, Oct 6, 2013.

  1. RightMACatU macrumors 65816

    RightMACatU

    Joined:
    Jul 12, 2012
    Location:
    192.168.1.1
    #1
    I've always thought that my 8GB SleepImage was useless since I will never be in a situation where I would loose power in Sleep mode, so I disabled it on my '13 MBA (13"/i7/8/512).

    But after a few days I re-enabled it for power reasons. Without a SleepImage, the MBA keeps the RAM 'alive' in Sleep mode pass the default 4200 seconds (70 minutes) since it can't write the contents of RAM to it and won't go into a deep sleep to save power.

    The results of no SleepImage were quite impressive: my 12-hour capable battery lost about 25% of juice per period of 8 hours in overnight Sleep mode :eek:

    Since I've restored the SleepImage, an 8 hours Sleep period will cost in the ball park of 2 to 4% :cool:
     
  2. Mrbobb macrumors 601

    Joined:
    Aug 27, 2012
    #2
    Makes sense the way you said it, now I assume you also reconfigured sleep mode, not just deleted the file right.

    My NO sleep image machine takes 8% juice in 8 hours, but I do have powerNAP disabled on battery.
     

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