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Thread: Can't adjust screen brightness on Macbook Pro 8.3, Oneiric

  1. #1
    Join Date
    Dec 2007
    Beans
    56

    Can't adjust screen brightness on Macbook Pro 8.3, Oneiric

    It's like this guy says: http://askubuntu.com/questions/90640...acbook-pro-8-3

    2011 8.3 MacBook Pro running 64bit 11.10.

    The screen brightness keys seems to actually do things (i see the Ubuntu-style indicators in the top right part of the screen when a button is pressed), but nothing actually changes with regard to actual laptop screen brightness.

    Is this a known issue? How can I adjust the screen brightness on my MacBook Pro?

    I tried
    Code:
    sudo echo 4 > /sys/class/backlight/acpi_video0/brightness
    but got
    Code:
    permission denied
    . Doing
    Code:
    echo 10 | sudo tee /sys/class/backlight/acpi_video0/brightness
    doesn't give the permission error, but has no effect that i noticed.

    I installed pommed which also didn't change anything. (Or do i have to manually install key bindings after installing pommed?)
    Last edited by kc600; December 31st, 2011 at 04:28 PM.

  2. #2
    Join Date
    Aug 2010
    Beans
    8

    Re: Can't adjust screen brightness on Macbook Pro 8.3, Oneiric

    This is not only a problem for the Macbook Pro 8.3, I'm running Ubuntu 11.10 64bit on Macbook Pro 8.2 and I have the same problem.

  3. #3
    Join Date
    Aug 2010
    Beans
    8

    Re: Can't adjust screen brightness on Macbook Pro 8.3, Oneiric

    Screen brightness now work on Macbook Pro 8.2.

    Probably because of some recent update, yesterday I rebooted and sceen brightness adjestment now works perfeclty.

  4. #4
    Join Date
    Aug 2010
    Beans
    8

    Re: Can't adjust screen brightness on Macbook Pro 8.3, Oneiric

    Sorry about my previous message, brightness adjustment worked only for a day, it stopped working at the next reboot....

    Nevertheless, here is a solution for Macbook Pro 8.2 :

    ( it's taken from https://help.ubuntu.com/community/MacBookPro8-2/Oneiric )

    Code:
    sudo add-apt-repository ppa:sforshee/apple-bl-gmux
    sudo apt-get update
    sudo apt-get install apple-gmux-dkms
    sudo modprobe -r apple_gmux
    sudo modprobe apple_gmux
    Then in the file /etc/default/grub, add the following ligne
    Code:
    acpi_backlight=vendor
    Reboot and enjoy.

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