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Thread: 2 folders in Sys/Class/Backlight?

  1. #1
    Join Date
    Jan 2012

    Arrow 2 folders in Sys/Class/Backlight?

    ISSUE: Backlight brightness does not change.

    More Detail: Brightness will not change, using both 'System Settings->Screen', or FN keys (Brightness bar shows and moves, but screen brightness does not change).

    Notcied a post in this thread ( about having multiple folders in Sys->Class->Backlight...


    'intel_backlight' and 'acpi_video0'

    Using the function keys, alters the value in the acpi_video0's 'Brightness' file - But doesn't actually alter the brightness of the screen.

    If I add 'backlight=vendor' in Grub, my function keys then edit the value in the 'Intel_Backlight brightness file. - But again doesnt actually change the brightness of the screen.

    Computer: Fujitsu Siemans Pi2515, Intel Integrated Graphics, No hdd partition.

    Already Tried:

    -Editing grub to contain: acpi_osi=Linux acpi_backlight=vendor


    -sudo apt-get install acpi

    -$ sudo setpci -s 00:02.0 F4.B=20

    -Brightness does not adjust in fallback mode either.

    -Reinstalling OS, Using Linux Mint (Same problem).

    -Upgrading and downgrading BIOS.

    Many thanks for reading, I understand this problem may need a bit of a Linux pro to sort. If anyones up for the challenge i'll spend any amount of time being walked through this, posting results. Don't want to give up here!

  2. #2
    Join Date
    Jan 2012

    Re: 2 folders in Sys/Class/Backlight?

    Unsure of rules, so apologies if Bumps are not allowed. Still got this problem, any help at all would be great, or any words of advice. Many thanks. Zebrapie.

  3. #3
    Join Date
    Aug 2011
    Melbourne, Australia.
    Xubuntu 14.04 Trusty Tahr

    Re: 2 folders in Sys/Class/Backlight?

    No problems with bumps if they are over 24 hour span period -

    Of course you can respond to answers to your posts at any time.
    Last edited by BlinkinCat; January 15th, 2012 at 01:57 AM. Reason: Additional information.
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  4. #4
    Join Date
    Jan 2012

    Re: 2 folders in Sys/Class/Backlight?

    Thank you BlinkinCat

    Gave up and re-installed Windose, same problem? FFFUUUUUUUUUU Now i'm confused!!

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