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Thread: Unable to adjust screen brightness

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  1. #1
    Join Date
    Jan 2012
    Beans
    8

    Unable to adjust screen brightness

    I have an HP Pavilion dv6 laptop running Natty. The brightness controls work fine in Windows but never worked in Ubuntu. I finally installed Kamal Mostafa's patch that worked perfectly for a while, and then abruptly stopped working a few months ago. At that point I did something (unfortunately I don't remember what) and got it working again, but then two things happened:

    1. My computer kept crashing (maybe once or twice a week for a few weeks) with a "Tainted" message and the name of the backlight patch; I don't remember exactly what the error was, but at the time the backlight controls continued to work so I didn't pay too much attention to it.

    2. Today the backlight controls stopped working again altogether, and I can't figure out what to do to fix it-- this is a somewhat more pressing problem for me since my eyes can't take the current screen brightness and no other adjustments have worked. I think it might have to do with an apt-get update/apt-get upgrade I did recently, but I have upgraded before today and it's been fine, so I don't know exactly what might be causing it.

    Any help would be very much appreciated.

    Thanks!

  2. #2
    Join Date
    Jun 2005
    Location
    Toronto, Canada
    Beans
    Hidden!
    Distro
    Xubuntu 14.04 Trusty Tahr

    Re: Unable to adjust screen brightness

    You could try posting a comment here (https://bugs.launchpad.net/ubuntu/+s...er/+bug/568611) about your problem, but according to the comments at the end, this PPA is no longer being supported (I can't confirm this though).

    It is possible that a kernel update borked your backlight. Have you tried booting with a previous kernel?

  3. #3
    Join Date
    Apr 2010
    Location
    Nova Scotia
    Beans
    47
    Distro
    Ubuntu 12.04 Precise Pangolin

    Re: Unable to adjust screen brightness

    I've had the brightness fn problem on my HP Pavilion dm3 with every ubuntu version including 12.04, until today.

    Try following the suggestion at:
    HTML Code:
    http://www.techjail.net/solved-brightness-problem-in-ubuntu-12-04-precise-pangolin.html

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