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Thread: HOWTO - Fix your laptops brightness function keys operating properly in 8.04 Hardy

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  1. #1
    Join Date
    Apr 2007
    Location
    Toronto
    Beans
    104
    Distro
    Ubuntu 13.04 Raring Ringtail

    Question HOWTO: Fix your laptops brightness function keys operating properly in 8.04 Hardy

    Hello folks,

    If you're like me, you recently installed Ubuntu Hardy Heron 8.04 and discovered that your laptops function keys are not properly adjusting the brightness. In essence, you are pressing the key combination and nothing is happening.

    I have written a fix that simply replaces two script files. This may or may not work for you. Always create a backup first.

    Here is what I edited within two files:

    First we are going to change brightness up

    Code:
    sudo gedit /etc/acpi/video_brightnessup.sh
    Replace everything in the file with the following

    Code:
    #!/bin/bash
    
    CURRENT=$(grep "current:" /proc/acpi/video/VGA/LCD/brightness |awk '{print $2}')
    
    
    case "$CURRENT" in
    
    100)
    echo -n 100 > /proc/acpi/video/VGA/LCD/brightness;
    ;;
    87)
    echo -n 100 > /proc/acpi/video/VGA/LCD/brightness;
    ;;
    75)
    echo -n 87 > /proc/acpi/video/VGA/LCD/brightness;
    ;;
    62)
    echo -n 75 > /proc/acpi/video/VGA/LCD/brightness;
    ;;
    50)
    echo -n 62 > /proc/acpi/video/VGA/LCD/brightness;
    ;;
    37)
    echo -n 50 > /proc/acpi/video/VGA/LCD/brightness;
    ;;
    25)
    echo -n 37 > /proc/acpi/video/VGA/LCD/brightness;
    ;;
    12)
    echo -n 25 > /proc/acpi/video/VGA/LCD/brightness;
    ;;
    *)
    echo -n 100 > /proc/acpi/video/VGA/LCD/brightness ;
    ;;
    esac
    Save and quit

    Now we are going to edit brightness down

    Code:
    sudo gedit /etc/acpi/video_brightnessdown.sh
    Replace everything in the file with the following

    Code:
    #!/bin/bash
    
    CURRENT=$(grep "current:" /proc/acpi/video/VGA/LCD/brightness |awk '{print $2}')
    
    
    case "$CURRENT" in
    
    12)
    echo -n 12 > /proc/acpi/video/VGA/LCD/brightness;
    ;;
    25)
    echo -n 12 > /proc/acpi/video/VGA/LCD/brightness;
    ;;
    37)
    echo -n 25 > /proc/acpi/video/VGA/LCD/brightness;
    ;;
    50)
    echo -n 37 > /proc/acpi/video/VGA/LCD/brightness;
    ;;
    62)
    echo -n 50 > /proc/acpi/video/VGA/LCD/brightness;
    ;;
    75)
    echo -n 62 > /proc/acpi/video/VGA/LCD/brightness;
    ;;
    87)
    echo -n 75 > /proc/acpi/video/VGA/LCD/brightness;
    ;;
    100)
    echo -n 87 > /proc/acpi/video/VGA/LCD/brightness;
    ;;
    *)
    echo -n 50 > /proc/acpi/video/VGA/LCD/brightness ;
    ;;
    esac
    Save and quit

    No reboot or logout required, simply press your function combination on your laptop to change brightness. If you're laptop is like mine, I press FN + Up/Down Arrow.

    Let me know how it works. If this does nothing, it's best to restore the backup you made prior.

    Post your comments in this thread, let me know how it goes.


    - AaronMT
    Last edited by AaronMT; April 26th, 2008 at 03:39 PM.

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