Do you have to use a power cable when connecting to an external display?

Discussion in 'MacBook Pro' started by Hieveryone, Dec 10, 2014.

  1. Hieveryone macrumors 68020

    Joined:
    Apr 11, 2014
  2. TheIguana macrumors 6502a

    TheIguana

    Joined:
    Sep 26, 2004
    Location:
    Canada
    #2
    Nope, but you'll run your battery down faster than if you were justing running the internal display.
     
  3. Hieveryone thread starter macrumors 68020

    Joined:
    Apr 11, 2014
    #3
    I'm not able to get my MBPr awake from sleep until I plug in the cable. I have full battery.
     
  4. yjchua95 macrumors 604

    Joined:
    Apr 23, 2011
    Location:
    GVA, KUL, MEL (current), ZQN
    #4
    If you want to close the lid and only run off the external display, that is called clamshell mode.

    And yes, for that to happen, you must be plugged into a power source.
     
  5. JoelTheSuperior macrumors 6502

    JoelTheSuperior

    Joined:
    Feb 10, 2014
    Location:
    London, UK
    #5
    I should mention, in my experience 'clamshell mode' has a fairly detrimental effect on the cooling abilities of the MacBook - it definitely seems to run a fair bit hotter in my experience like this, which may damage the screen and other components.
     

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