1. #1
    Unregistered

    Macbook Pro not working in Clamshell mode after Mountain Lion update

    I just went for the Mountain Lion update in my Macbook Pro and now Clamshell mode is not working at all. I want to leave the display open in order to use the external display but it just turn itself off in a few second. Can you please provide me the information for this? Thanks.

  2. #2
    Support Array
    Join Date
    Oct 2012
    Posts
    434

    Re: Macbook Pro not working in Clamshell mode after Mountain Lion update

    Now the issue is that after the Mountain Lion update many of the sudo commands won’t work which will not allow your Mac lid open without the screen getting off and also when you try connecting the external display it just goes into the sleep mode while in clamshell mode.

    To fix this problem you need to run the command “sudo nvram -d boot-args” in the command terminal and reboot your Macbook once. Now you can plug your external display again where you can use the clamshell mode without any issues.

    Make sure that you have not selected the sleep on from the System Preferences -> Energy Saver -> and slide the bar to the end to make your computer not going into sleep mode. This should help your Mac to be ON every time without any problem.

  3. #3
    Mac Array
    Join Date
    Dec 2012
    Posts
    684

    Re: Macbook Pro not working in Clamshell mode after Mountain Lion update

    ================================================== ==================================================

    Steps to solve the issue:

    =) First need to go to the dock.

    =) Then open the terminal window from it.


    =) Now here you type in the command
    "sudo nvram -d boot-args".


    =) After doing you can reboot the Mac.

    =) Once this is will done your problem is solved.


    Done.

    ================================================== ================================================== ===

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