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Thread: No backlight after suspend

  1. #1
    Join Date
    Jul 2010
    Beans
    148

    No backlight after suspend

    Installed 13.04 into one of the partitions of an Acer Aspire 15.6" notebook. Problem: No backlight after waking up from suspend. I can "see" (just barely) the sign-in dialog window, but it was very dark. This was probably only due to a reflection from the ambient light, the backlight was not turned on.

    I have 11.04, 11.10, 12.04LTS, and 12.10 installed on other partitions of the same notebook. 13.04 is the only version that gives the this no-backlight problem.
    Last edited by ping-wu; March 3rd, 2013 at 10:47 PM.

  2. #2
    Join Date
    Jul 2012
    Beans
    14

    Re: No backlight after suspend

    Quote Originally Posted by ping-wu View Post
    Installed 13.04 into one of the partitions of an Acer Aspire 15.6" notebook. Problem: No backlight after waking up from suspend. I can "see" (just barely) the sign-in dialog window, but it was very dark. This was probably only due to a reflection from the ambient light, the backlight was not turned on.

    I have 11.04, 11.10, 12.04LTS, and 12.10 installed on other partitions of the same notebook. 13.04 is the only version that gives the this no-backlight problem.
    I've gotten the same problem. What I did to work around this problem:
    sudo gedit /etc/pm/sleep.d/00-displayfix
    Copypasta the next few lines and save.

    Code:
    #!/bin/sh
    case "$1" in
            thaw|resume)
            echo 500 > /sys/class/backlight/intel_backlight/brightness
            ;;
            *)
            ;;
    esac
    exit $?
    Finally, make it executable:
    sudo chmod a+x /etc/pm/sleep.d/00-displayfix
    The script might be a little different depending on your hardware. If it does not work, just find out the path to your backlights interface.

  3. #3
    Join Date
    Jul 2010
    Beans
    148

    Re: No backlight after suspend

    Quote Originally Posted by beidl View Post
    I've gotten the same problem. What I did to work around this problem:


    Copypasta the next few lines and save.

    Code:
    #!/bin/sh
    case "$1" in
            thaw|resume)
            echo 500 > /sys/class/backlight/intel_backlight/brightness
            ;;
            *)
            ;;
    esac
    exit $?
    Finally, make it executable:


    The script might be a little different depending on your hardware. If it does not work, just find out the path to your backlights interface.
    Thanks, your workaround works!

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