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Thread: 13.04 - Backlight Display Brightness Doesn't Change (Fn + Left/Right Keys)

  1. #1
    Join Date
    May 2013
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    13.04 - Backlight Display Brightness Doesn't Change (Fn + Left/Right Keys)

    Hi, new forum poster here. I can't adjust the backlight brightness using the function + left/right keys on my Acer laptop. In previous versions of Ubuntu (12.04, 12.10), this was fixed by editing /etc/default/grub and adding

    "acpi_backlight=vendor"
    to
    "GRUB_CMDLINE_LINUX_DEFAULT="quiet splash"
    and then
    "sudo update-grub"

    This no longer seems to work in 13.04. What should I do? Thanks
    Last edited by 4Sci; June 19th, 2013 at 06:23 AM.

  2. #2
    Join Date
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    Re: 13.04 - Backlight Display Brightness Doesn't Change (Fn + Left/Right Keys)

    Instead of
    Code:
    GRUB_CMDLINE_LINUX_DEFAULT="quiet splash"
    modify it to
    Code:
     GRUB_CMDLINE_LINUX_DEFAULT="quiet splash acpi_backlight=vendor"
    or if it still doesn't work, modify it to
    Code:
    GRUB_CMDLINE_LINUX_DEFAULT="quiet splash acpi_osi=Linux acpi_backlight=vendor"
    Save and close /etc/default/grub​, update grub:
    Code:
    sudo update-grub
    and reboot your computer.

    Edit: And be very welcome to the forums.
    Please mark your thread as solved if you get a satisfactory response.

  3. #3
    Join Date
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    Re: 13.04 - Backlight Display Brightness Doesn't Change (Fn + Left/Right Keys)

    Thank you! I had to add "acpi_osi=Linux" to that grub line to get it working.

  4. #4
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    Re: 13.04 - Backlight Display Brightness Doesn't Change (Fn + Left/Right Keys)

    Quote Originally Posted by 4Sci View Post
    Thank you! I had to add "acpi_osi=Linux" to that grub line to get it working.
    There is no need to thank, we're all here to help each other. Please mark this thread as solved so other people searching the forums know that this thread provides a working solution for their problem. If you don't know how, follow the link in my signature on how to do it.
    Please mark your thread as solved if you get a satisfactory response.

  5. #5
    Join Date
    Dec 2008
    Location
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    Distro
    Ubuntu 13.04 Raring Ringtail

    Re: 13.04 - Backlight Display Brightness Doesn't Change (Fn + Left/Right Keys)

    Quote Originally Posted by slickymaster View Post
    Instead of
    Code:
    GRUB_CMDLINE_LINUX_DEFAULT="quiet splash"
    modify it to
    Code:
     GRUB_CMDLINE_LINUX_DEFAULT="quiet splash acpi_backlight=vendor"
    or if it still doesn't work, modify it to
    Code:
    GRUB_CMDLINE_LINUX_DEFAULT="quiet splash acpi_osi=Linux acpi_backlight=vendor"
    Save and close /etc/default/grub​, update grub:
    Code:
    sudo update-grub
    and reboot your computer.

    Edit: And be very welcome to the forums.
    Just came here to post thanks for this. Helped me to get my brightness keys working again on Ubuntu 13.04 on my Acer Aspire V5-571P-6831.

  6. #6
    Join Date
    Dec 2013
    Beans
    1

    Re: 13.04 - Backlight Display Brightness Doesn't Change (Fn + Left/Right Keys)

    it doesn't work for me, i have the same computer, please help

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