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Thread: Brightness keys have no effect (no output in xev) on Clevo

  1. #1
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    Angry Brightness keys have no effect (no output in xev) on Clevo

    Dear all

    My brightness keys have no effect on my Clevo laptop. 12.04.

    - my brightness keys have no output in "xev" , nor in "sudo showkey -k"
    - "xmodmap -pke" shows:
    Code:
    keycode 237 = XF86KbdBrightnessDown NoSymbol XF86KbdBrightnessDown
    keycode 238 = XF86KbdBrightnessUp NoSymbol XF86KbdBrightnessUp
    - no change with the "acpi_osi=Linux acpi_backlight=vendor" option
    - no change with kernel 3.4

    Until here, my situation have common points with this one: http://ubuntuforums.org/showthread.php?t=2039350

    But the difference is that the "sudo setpci -s 00:02.0 F4.B=xx" workaround doesn't work for me. (00:02.0 is ok, and i tried xx=20 , 40, 60, 80)

    Any idea please?
    Last edited by YannBuntu; August 23rd, 2012 at 10:55 PM.

  2. #2
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    Re: Brightness keys have no effect (no output in xev) on Clevo

    Can you post the results of:
    Code:
    lspci | grep VGA
    And while you're at it, can you also provide the results of the following:
    Code:
    sudo dmidecode -s system-manufacturer
    sudo dmidecode -s system-product-name
    A look at your dmesg log file might help as well:
    Code:
    pastebinit /var/log/dmesg
    ...and post back the link that is generated.

    And finally, your backlight interfaces:
    Code:
    for file in /sys/class/backlight/*; do echo $file; cat $file/actual_brightness; cat $file/max_brightness; cat $file/brightness; done
    In the meantime, give the "acpi_osi=" kernel parameter a try. Thats "acpi_osi=" without an accompanying string value.

    EDIT: you might also want to give acpi_osi="Windows 2006" a try. It will be tricky to get the escaping correct on the grub line. If editing /etc/default/grub, it would look like this:
    Code:
    GRUB_CMDLINE_LINUX_DEFAULT="quiet splash acpi_osi=\"Window 2006\""
    Last edited by Toz; August 24th, 2012 at 12:08 AM.

  3. #3
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    Re: Brightness keys have no effect (no output in xev) on Clevo

    Hello Toz, thanks for your interest

    Code:
    lspci | grep VGA
    00:02.0 VGA compatible controller: Intel Corporation 2nd Generation Core Processor Family Integrated Graphics Controller (rev 09)
    Code:
    sudo dmidecode -s system-manufacturer
    CLEVO CO.
    Code:
    sudo dmidecode -s system-product-name
    W240HU/W250HUQ
    Code:
    pastebinit /var/log/dmesg
    http://paste.ubuntu.com/1163952
    Code:
    for file in /sys/class/backlight/*; do echo $file; cat $file/actual_brightness; cat $file/max_brightness; cat $file/brightness; done
    /sys/class/backlight/acpi_video0
    7
    7
    7
    /sys/class/backlight/intel_backlight
    4882
    4882
    4882
    I will try the kernel option.

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    Arrow Re: Brightness keys have no effect (no output in xev) on Clevo

    the correct syntax is:
    Code:
    GRUB_CMDLINE_LINUX_DEFAULT='quiet splash acpi_osi="Window 2006"'
    ..but it doesn't work for me.

    However, the acpi_osi= option seems to be a correct workaround (the keys increase/decrease brightness, but still no output in showkey nor xev, and still no effect with "setpci -s 00:02.0 F4.B=XX").
    Thanks for suggesting it !
    Last edited by YannBuntu; August 24th, 2012 at 08:57 AM.

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    Re: Brightness keys have no effect (no output in xev) on Clevo

    however, when using acpi_osi=, I can't adjust brightness via the System settings->Brightness and lock menu any more. (the slide bar has no effect any more)


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    Re: Brightness keys have no effect (no output in xev) on Clevo

    Not sure if this can help:
    - With and without acpi_osi=, "ls /sys/class/backlight" returns:
    Code:
    acpi_video0  intel_backlight
    - But with acpi_backlight=vendor, it returns only:
    Code:
    intel_backlight
    - with acpi_backlight=vendor, nothing works, neither the hotkeys nor the System Settings way.

    I will create a bug report.
    Last edited by YannBuntu; August 24th, 2012 at 09:52 AM.

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    Exclamation Re: Brightness keys have no effect (no output in xev) on Clevo


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    Re: Brightness keys have no effect (no output in xev) on Clevo

    Quote Originally Posted by YannBuntu View Post
    Not sure if this can help:
    - With and without acpi_osi=, "ls /sys/class/backlight" returns:
    Code:
    acpi_video0  intel_backlight
    - But with acpi_backlight=vendor, it returns only:
    Code:
    intel_backlight
    - with acpi_backlight=vendor, nothing works, neither the hotkeys nor the System Settings way.

    I will create a bug report.
    Can you try with acpi_backlight=legacy and acpi_backlight=video

  9. #9
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    Re: Brightness keys have no effect (no output in xev) on Clevo

    tested each one separately. No effect.

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    Re: Brightness keys have no effect (no output in xev) on Clevo

    Which of the backlight interfaces are active? You can test by echoing a value to the brightness file. e.g.:
    Code:
    echo 4 | sudo tee /sys/class/backlight/acpi_video0/brightness
    Code:
    echo 2441 | sudo tee /sys/class/backlight/intel_backlight/brightness
    ...I chose the values as half of what was reported back in post #3.

    What modules are loaded?
    Code:
    lsmod
    And what kernel parameter(s) are we working with:
    Code:
    cat /proc/cmdline

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