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  • venugopala Level 1 Level 1

    >sudo nvram boot-args="iog=0x0"


    I had to this command so that my MBP lid can be opened while i work on external display. If the lid is closed i see my MBP is getting too hot and fans spin faster.


    Until i movied to 10.8.2, to get my external display run in max resulution, what i have to do was, power on MBP, once i see login screen, close the MBP lid, and click on external key board or tracpad/mouse to get login screen appear on external display in full resolution. now i can open the MBP lid.


    After moving to 10.8.2, if i follow above steps, my external display is not running in max resolution mode. what i found is after i power on MBP, just when you see spinning wheel, close the lid. after few mins you will see the login screen in max resolution on external display.

  • z1zms Level 1 Level 1

    correct, this solutions works...however if you were to put your laptop to sleep, when it wakes up you are back in the same situation as before, unless you reboot and close the lid as it boots up again.

  • venugopala Level 1 Level 1

    It works fine in my case even after i put MBP into sleep. After the first power on, did you move MBP from external display setup ?. In my case as long as i don't move my MBP from external display setup, it works fine even after waking from sleep.

  • daenneys Level 1 Level 1

    Same issue.


    I switch a lot between builtin-screen (when travelling) and single external display which makes this 'feature' terribly annoying. I have to restart my machine twice to three times a day, and it's not even running Windows.


    The nvram setting seems to get lost somehow which really isn't supposed to happen, it's called non-volatile RAM for a reason. This leads me to think something is overwriting that setting so we'd need to figure out a way to see who and what is touching nvram's boot-args.

  • Jazzyalex Level 1 Level 1

    Exactly.  and before 10.8.2 it worked all the time, even when you switch between external and internal displays.

  • Paldeng Level 2 Level 2

    Hi are you ceonnected on the power adapter? To be able do run the mac on an LCD with the LId closed make sure the laptop is connecetd on the Power Adpater

  • yectep Level 1 Level 1

    I'm sure most if not all of us are. This is an issue that just popped up after 10.8.2.


    In any case, Macs won't even wake with the lid closed without AC and display plugged in. In this situation the Mac will wake, the display will show the login screen, then about 10 seconds later the Mac seems to ignore that screen, realize the lid is closed, and go back to sleep.


    Nothing in Console seems to show what's deciding that anyway so we don't have much to start with...

  • La_Fouinard Level 1 Level 1

    Found something that seems to sort mine. Reset the NVRAM ( and try the sudo command again in Terminal and reboot.


    Mine's now back to normal, the 10.8.2 update did mention something about a firmware update so I suspect that's what's knocked it off.


  • z1zms Level 1 Level 1

    Doesn't seem to have worked for me...

  • JBrey Level 1 Level 1

    It also seems to have worked for me. The steps for anyone so you can it them a try:

    • Reset NVRAM (restart, hold "Command", "Option", "P", "R" keys from start, then wait until you see the grey boot up screen for just few secs until you see it restart again).
    • Enter in the Terminal the famous > sudo nvram boot-args="iog=0x0"
    • Shutdown/Reboot the system


    I've got it working now, built-in screen off, external monitor on with lip open. I have not yet tried to put it to sleep and back on again... don't want to push my luck.

  • shmootz5 Level 1 Level 1

    Thanks for all your help but none of it seems to work. I have just dimanteled my HengeDock for now and gone back to having my Macbook screen open with cables everywhere. SUCH a shame


    But when/if this is fixed I can certainly recommend the HengeDock as it did work great!

  • angelofrombern Level 1 Level 1

    This worked for me (Retina MacBook Pro):

    - Reset NVRAM

    - Booting into startup disc selection (or whatever its called - press option key on start-up)

    - Select to restore your system (if the option is not available reinstall M-Lion it via USB stick)


    I'm still on 10.8.2 but Thunderbold and HDMI work as before with external screens.


    Some gotchas that I had to take care of:

    - Disabled FileVault

    - Resetted SMC

    - Repaired Disc and restored Permissions

    - Did a System Diagnostig (hold d on startup)

  • thomnas Level 1 Level 1

    I have been using clamshell mode with my Mid 2009 MacBook Pro (MacBookPro5,3) with the same monitor all the way from Snow Leopard to Lion to Mountain Lion. Now when trying to use clamshell mode, closing the lid, hooking up my monitor, keyboard and mouse, does no longer wake up my Mac from sleep. This has happened after upgrading to 10.8.2. The monitor turns on, but turns of after 5 seconds and my Mac goes back to sleep again. None of the mentioned fixes works for me. Please fix this problem Apple.

  • astachur Level 1 Level 1

    Same here thomnas. I'm running on an older 2007 MacBookPro3,1. Apple please fix this defect in 10.8.2.

  • Robottinosino Level 1 Level 1

    Apple, please _restore_ this fundamental functionality that is making my monitor useless, my desk setup a joke and all the rest of it? Why break things with a "software update"? Bad quality checks on your releases!