cannot wake up with an external display

Discussion in 'MacBook Pro' started by scegg, Sep 25, 2012.

  1. scegg macrumors newbie

    Sep 25, 2012

    After upgrading to 10.8.2, my computer cannot wake up from sleep with an external display attached at all.

    MBPR custermized (2.6G/16G/512G) + External display (connected by DVI through Thunderbolt)

    Step to repo: All test need an external display plugged in. I've tested w/o external display, all passed.
    1 Plug in an external display. Disable Mirror Displays.
    2 Power on.
    3 Choose Sleep from Apple menu.
    4 Close the lid.
    5 Pull off the power cord for several second. This can be longer if you like.
    6 Plug in the power cord.
    7 Open the lid.

    Sometimes, you can get the external display show up the desktop background but usually it's black out. Anyway, the screen on the laptop is black out.
    The laptop is warming up and the fan will work later. But you cannot wake up it at all. You have to push the power button for 5 sec and once again to enforce to restart it.

    It can be repo all the time on my computer.
    I have tried to reinstall OSX 10.8. Before upgrading to 10.8.2, no such a problem. But after the patch is applied, it will always be. No other software except 10.8.2 combo upgrade package is installed when I test.

    Command + Alt + PR is useless, which i've tested.

    What should I do? Thanks in advance.
  2. BeyondMountains macrumors 6502

    Jan 11, 2008
    I have this same problem but it only happens randomly.
  3. glenstorey macrumors newbie

    Oct 12, 2012
    Me too

    I think I've narrowed it down to only when a screen is attached.

    - reset pram, SMC, booted in safe mode, reinstalled Mountain lion (fresh), replaced my mac with a brand new one (It all happened in the 14 day period).

    It only happens randomly; I only think it happens when the screen is plugged in. Anyone made any progress?

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