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Thread: Brightness adjustment is not working properly,

  1. #1
    Join Date
    Aug 2012

    Question Brightness adjustment is not working properly,

    Hello there,

    I am using Ubuntu 12.04 on a Samsung Laptop (300e4a-ad1 model). To get brightness adjustment through multimedia keys working properly i've ever used these lines on /etc/default/grub file:

    GRUB_DISTRIBUTOR=`lsb_release -i -s 2> /dev/null || echo Debian`
    GRUB_CMDLINE_LINUX_DEFAULT="quiet acpi_osi=Linux acpi_backlight=vendor enable_mtrr_cleanup splash"
    Until the kernel 3.2.0-26-generic it was ok but after any kernel update i can't adjust brightness using the newer kernel through multimedia keys. With acpi_osi=Linux acpi_backlight=vendor it doesn't change nothing and without it or with acpi_osi=Linux acpi_backlight=legacy, the environment is crashing when i try to change the brightness.

    I think that it's not related to kernel as i compared the both config files, dmesg and modules. Anybody seen or is experiencing the same problem?

    Thank you.

  2. #2
    Join Date
    Aug 2012

    Thumbs down Re: Brightness adjustment is not working properly,


    I was able to fix the issue by adding "blacklist samsung_laptop" to the file /etc/modprobe.d/blacklist.conf, everything is working fine now. I am really unsure about the reason of this module cause those issues, as it was already loaded on older kernels.

    Moderation, feel free to close this ticket as a resolved issue.

    Thank you.

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