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Thread: Brightness fn keys not working for Sony VGN NR21S

  1. #1
    Join Date
    Jul 2011
    Ubuntu 10.04 Lucid Lynx

    Brightness fn keys not working for Sony VGN NR21S

    Hi there,

    The function keys regarding the brightness do not work on my laptop. I am using Ubuntu 10.4 Lucid Lynx LTS 32 bit version.

    I've looked on the internet for help regarding my laptop but I cant find any solutions regarding the brightness function keys for my laptop Sony Vaio VGN NR21S. The graphics card in my laptop is NVidia Geforce 8400M GT.

    I've tried writing brightness-up and brightness down scripts along with a bash script but even those don't work.

    I tried Gnome Power Manager but that didn't solve any issues.

    The wireless and sound functions work.

    Are there any solutions available for this particular laptop model? I would really appreciate your input regarding the above.

    Thanks in advance.

  2. #2
    Join Date
    Dec 2010

    Re: Brightness fn keys not working for Sony VGN NR21S

    Try installing xbacklight and
    Increase with xbacklight -inc 10
    Decrease with xbacklight -dec 10
    If that doesn't work, maybe xgamma. If not, you're stuck.
    Sorry about that.
    I support SOPA and I dare say it.

  3. #3
    Join Date
    Jul 2006
    London, UK
    Ubuntu 10.04 Lucid Lynx

    Re: Brightness fn keys not working for Sony VGN NR21S

    There's a long thread here that may give you some ideas.

    Otherwise, if you are using the NVIDIA driver, you can control brightness from the "NVIDIA X Server Settings" application.

    You can also take a look in /proc

    I have /proc/acpi/video/NGFX/LCD/brightness to which I can echo numbers to change the brightness:
    tred@vaio:~$ cat /proc/acpi/video/NGFX/LCD/brightness
    levels:  4 16 28 40 52 64 76 88 100
    current: 100
    tred@vaio:~$ sudo sh -c 'echo 52 > /proc/acpi/video/NGFX/LCD/brightness'
    [sudo] password for tred: 
    tred@vaio:~$ sudo sh -c 'echo 100  > /proc/acpi/video/NGFX/LCD/brightness'

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