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Thread: The brightness setting

  1. #1
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    The brightness setting

    I have not found any info on this. I am using 12.04.
    I have to adjust my brightness setting every time I start my computer.
    Why won't it stay where I set the slide bar? Is it a bug? or is is it tired into power management somehow?

    I would love to solve this!
    What keeps the world in chains but your beliefs?
    And what can save the world except your Self?
    Belief is powerful indeed.

  2. #2
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    Re: The brightness setting

    the way i have always dealt with it is to:

    1. set the required brightness

    2. restart


    it remembers if i do that.

  3. #3
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    Exclamation Re: The brightness setting

    Hey thanks for the response BV
    But that still did not work.

    I also tried this:
    http://ubuntuguide.net/how-to-save-s...u-12-04-laptop

    which did not work either...

    I will keep on looking I guess

    Cheers
    What keeps the world in chains but your beliefs?
    And what can save the world except your Self?
    Belief is powerful indeed.

  4. #4
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    Re: The brightness setting

    That link you reference should work, but you have to have the proper information (his command may not work on your computer). What backlight interfaces do you have? Run this command and post back the results:
    Code:
    for interface in /sys/class/backlight/*; do echo $interface; cat $interface/actual_brightness; cat $interface/max_brightness; done
    EDIT: make sure you run that command when the brightness is at the setting you want on restart.

  5. #5
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    Re: The brightness setting

    Thanks for the response
    Here it is:

    /sys/class/backlight/acpi_video0
    5
    7
    /sys/class/backlight/intel_backlight
    2871
    4882
    /sys/class/backlight/toshiba
    5
    7

    Is this a fix or just a systems check?

    What keeps the world in chains but your beliefs?
    And what can save the world except your Self?
    Belief is powerful indeed.

  6. #6
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    Re: The brightness setting

    Just a system check. Which of the following commands change the brightness:
    Code:
    echo 7 | sudo tee /sys/class/backlight/acpi_video0/brightness
    ...or

    Code:
    echo 7 | sudo tee /sys/class/backlight/toshiba/brightness

  7. #7
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    Re: The brightness setting

    Yes, The first one:
    echo 7 | sudo tee /sys/class/backlight/acpi_video0/brightness

    I tried adding this : echo 7 > /sys/class/backlight/acpi_video0/brightness

    to
    /etc/rc.local and then restart but it did not work...

    What am I missing

    Thanks again for the help.
    Last edited by acimi66; May 19th, 2012 at 05:12 PM. Reason: new info
    What keeps the world in chains but your beliefs?
    And what can save the world except your Self?
    Belief is powerful indeed.

  8. #8
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    Re: The brightness setting

    echo 7 > /sys/class/backlight/acpi_video0/brightness
    would set the brightness to full. If you want it less bright, try echoing 5 instead. Make sure your command is above the exit 0 command. Maybe post back the contents of /etc/rc.local to ensure its correct.

  9. #9
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    Re: The brightness setting

    Would be a good idea to report this as a bug, although there should be some patches, it's always helpful to the developers to have a bug record of it.
    CrunchBang Linux
    Plz no tpe lik dis or no anser!!
    The search tool can be found in the upper right corner of your screen, please use it to your advantage, especially before asking questions.

  10. #10
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    Re: The brightness setting

    Ok, so here is the file:

    #!/bin/sh -e
    #
    # rc.local
    #
    # This script is executed at the end of each multiuser runlevel.
    # Make sure that the script will "exit 0" on success or any other
    # value on error.
    #
    # In order to enable or disable this script just change the execution
    # bits.
    #
    # By default this script does nothing.

    echo 6 > /sys/class/backlight/acpi_video0/brightness

    exit 0

    I went with 6, but it still does not save it after a restart. bummer.
    I will report it as a bug.

    Bug Report sent to launchpad
    Last edited by acimi66; May 19th, 2012 at 06:46 PM. Reason: update
    What keeps the world in chains but your beliefs?
    And what can save the world except your Self?
    Belief is powerful indeed.

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