Clamshell mode running without power?

Discussion in 'MacBook Pro' started by raymondu999, Apr 2, 2009.

  1. raymondu999 macrumors 65816

    Feb 11, 2008
    Hi all... I have just recently begun to notice that if I'm not running on AC power, my MBP refuses to do clamshell mode:confused: It just goes to sleep when closed. However, when it's running on AC power, it stays awake. Is this the behavior that it's supposed to exhibit, or am I missing something?
  2. nerdish macrumors regular

    Jan 28, 2009
    Manchester, UK
    Thats how it works!

    No AC = it will sleep.
  3. Consultant macrumors G5


    Jun 27, 2007
    You might need new battery.
    Have you calibrated your battery?
  4. halfbelgian macrumors member


    Jan 31, 2009
    Winnipeg, Canada

  5. kolax macrumors G3

    Mar 20, 2007
    Use InsomniaX to disable sleep so you can run it with the lid closed.

    I have it set to open at start up, and have the key combo "CTRL ALT =" to enable and disable lid sleep. Really useful, and means you don't have to put your Mac to sleep then wake it for clamshell mode to work.

    It'll solve your problem with the battery anyway.

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