Page 1 of 4 123 ... LastLast
Results 1 to 10 of 31

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

  1. #1
    Join Date
    Jan 2008
    Location
    France
    Beans
    Hidden!
    Distro
    Ubuntu Development Release

    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
    Join Date
    Jun 2005
    Location
    Toronto, Canada
    Beans
    Hidden!
    Distro
    Xubuntu 16.04 Xenial Xerus

    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
    Join Date
    Jan 2008
    Location
    France
    Beans
    Hidden!
    Distro
    Ubuntu Development Release

    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.

  4. #4
    Join Date
    Jan 2008
    Location
    France
    Beans
    Hidden!
    Distro
    Ubuntu Development Release

    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.

  5. #5
    Join Date
    Jan 2008
    Location
    France
    Beans
    Hidden!
    Distro
    Ubuntu Development Release

    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)


  6. #6
    Join Date
    Jan 2008
    Location
    France
    Beans
    Hidden!
    Distro
    Ubuntu Development Release

    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.

  7. #7
    Join Date
    Jan 2008
    Location
    France
    Beans
    Hidden!
    Distro
    Ubuntu Development Release

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


  8. #8
    Join Date
    Jun 2005
    Location
    Toronto, Canada
    Beans
    Hidden!
    Distro
    Xubuntu 16.04 Xenial Xerus

    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
    Join Date
    Jan 2008
    Location
    France
    Beans
    Hidden!
    Distro
    Ubuntu Development Release

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

    tested each one separately. No effect.

  10. #10
    Join Date
    Jun 2005
    Location
    Toronto, Canada
    Beans
    Hidden!
    Distro
    Xubuntu 16.04 Xenial Xerus

    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

Page 1 of 4 123 ... LastLast

Tags for this Thread

Bookmarks

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •