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Thread: No Brightness Control Sony T series Ubuntu 12.10

  1. #1
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    No Brightness Control Sony T series Ubuntu 12.10

    Sorry I read this thread: http://ubuntuforums.org/showthread.php?t=2088190 and it is very similar and I wasnt sure if i should reply or start new thread. I have a JP Sony vaio 13' T-series dual boot windows8 oem with 12.10.

    But like the poster I was able to change brightness up and down with the terminal command:

    echo 2441 | sudo tee /sys/class/backlight/intel_backlight/brightness

    and

    echo 4882 | sudo tee /sys/class/backlight/intel_backlight/brightness

    here is my acpi_listen:

    zombie@zombie:~$ acpi_listen
    video DD02 00000087 00000000
    video DD02 00000086 00000000

    im stuck here as the other poster has a different output. Any help would greatly be appreciated.

  2. #2
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    Xubuntu Development Release

    Re: No Brightness Control Sony T series Ubuntu 12.10

    zombie@zombie:~$ acpi_listen
    video DD02 00000087 00000000
    video DD02 00000086 00000000
    Are these the codes that are generated when you press the Fn+F5 (brightness down) and Fn+F6 (brightness up) keys? They don't look right.

  3. #3
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    Re: No Brightness Control Sony T series Ubuntu 12.10

    Yes the first is FN+F5 (brightness up) FN+F6 (down)

  4. #4
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    Re: No Brightness Control Sony T series Ubuntu 12.10

    Quote Originally Posted by Dendo View Post
    Sorry I read this thread: http://ubuntuforums.org/showthread.php?t=2088190 and it is very similar and I wasnt sure if i should reply or start new thread. I have a JP Sony vaio 13' T-series dual boot windows8 oem with 12.10.

    But like the poster I was able to change brightness up and down with the terminal command:

    echo 2441 | sudo tee /sys/class/backlight/intel_backlight/brightness

    and

    echo 4882 | sudo tee /sys/class/backlight/intel_backlight/brightness

    here is my acpi_listen:

    zombie@zombie:~$ acpi_listen
    video DD02 00000087 00000000
    video DD02 00000086 00000000

    im stuck here as the other poster has a different output. Any help would greatly be appreciated.

    the brightness is controlled by the kernel
    type us:

    lsmod

  5. #5
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    Re: No Brightness Control Sony T series Ubuntu 12.10

    Quote Originally Posted by Dendo View Post
    Yes the first is FN+F5 (brightness up) FN+F6 (down)
    Follow the same steps in that previous thread, but use the following files instead:

    /etc/acpi/events/sony-brightness-up
    Code:
    event=video DD02 00000087 00000000
    action=/etc/acpi/brightup.sh
    /etc/acpi/events/sony-brightness-down
    Code:
    event=video DD02 00000086 00000000
    action=/etc/acpi/brightdown.sh

  6. #6
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    Re: No Brightness Control Sony T series Ubuntu 12.10

    Thank you so much it worked. I will mark as SOLVED.

  7. #7
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    Talking Re: No Brightness Control Sony T series Ubuntu 12.10

    I have a sony Vaio VPCEG3AEN and the following worked for me:

    I opened the file /etc/X11/xorg.conf and changed the below section

    sudo gedit /etc/X11/xorg.conf

    Initially the setion was:

    Section "Device"
    Identifier "Device0"
    Driver "nvidia"
    VendorName "NVIDIA Corporation"
    EndSection


    Changed it to:

    Section "Device"
    Identifier "Device0"
    Driver "nvidia"
    VendorName "NVIDIA Corporation"
    Option "NoLogo" "True"
    Option "RegistryDwords" "EnableBrightnessControl=1"
    EndSection


    Note: Some forums suggest a change in the /etc/default/grub file
    You need to revert back those changes for this to work

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