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Thread: Brightness Fn Keys Not Working

  1. #1
    Join Date
    Mar 2012
    Beans
    1

    Brightness Fn Keys Not Working

    I have read various threads addressing issues like mine with nvidia graphics cards, but I have not wanted to try them because I have an intel HD 3000. I am running ubuntu on a samsung series 3 laptop. Everything works fine except the Fn keys for the brightness. I can change the brightness by going into the system settings. When I press the Fn keys it will only let me lower the brightness by one level. The Fn keys work for volume just fine.

  2. #2
    Join Date
    Jun 2005
    Location
    Toronto, Canada
    Beans
    Hidden!
    Distro
    Xubuntu 16.04 Xenial Xerus

    Re: Brightness Fn Keys Not Working

    Hello and welcome to the forums.

    Can you provide some more information about your system? Open a terminal window, type in the following commands, and post back the results:

    1. Show your kernel boot command line:
    Code:
    cat /proc/cmdline
    2. Show your system model:
    Code:
    sudo dmidecode -s system-product-name
    ...note, you'll need to enter your password to get access to this info.

    3. Show what backlight interfaces you have available:
    Code:
    ls /sys/class/backlight
    4. Show which modules you have loaded:
    Code:
    lsmod

  3. #3
    Join Date
    Oct 2010
    Beans
    16
    Distro
    Kubuntu 10.04 Lucid Lynx

    Re: Brightness Fn Keys Not Working

    Quote Originally Posted by Toz View Post
    Hello and welcome to the forums.

    Can you provide some more information about your system? Open a terminal window, type in the following commands, and post back the results:

    1. Show your kernel boot command line:
    Code:
    cat /proc/cmdline


    BOOT_IMAGE=/boot/vmlinuz-2.6.38-8-generic root=UUID=565606ba-b7f7-4f9e-99a8-c1d6c66b5c8d ro quiet splash vt.handoff=7


    2. Show your system model:
    Code:
    sudo dmidecode -s system-product-name
    ...note, you'll need to enter your password to get access to this info.

    Aspire 5755G

    3. Show what backlight interfaces you have available:
    Code:
    ls /sys/class/backlight
    acpi_video0


    4. Show which modules you have loaded:
    Code:
    lsmod
    Module Size Used by
    aesni_intel 17758 2
    cryptd 19801 1 aesni_intel
    aes_i586 16956 1 aesni_intel
    aes_generic 38023 2 aesni_intel,aes_i586
    binfmt_misc 13213 1
    parport_pc 32111 0
    ppdev 12849 0
    snd_hda_codec_hdmi 27479 1
    snd_hda_codec_realtek 255820 1
    snd_hda_intel 24140 4
    snd_hda_codec 90901 3 snd_hda_codec_hdmi,snd_hda_codec_realtek,snd_hda_i ntel
    snd_hwdep 13274 1 snd_hda_codec
    snd_pcm 80244 4 snd_hda_codec_hdmi,snd_hda_intel,snd_hda_codec
    snd_seq_midi 13132 0
    arc4 12473 2
    snd_rawmidi 25269 1 snd_seq_midi
    snd_seq_midi_event 14475 1 snd_seq_midi
    snd_seq 51291 2 snd_seq_midi,snd_seq_midi_event
    snd_timer 28659 2 snd_pcm,snd_seq
    snd_seq_device 14110 3 snd_seq_midi,snd_rawmidi,snd_seq
    snd 55295 17 snd_hda_codec_hdmi,snd_hda_codec_realtek,snd_hda_i ntel,snd_hda_codec,snd_hwdep,snd_pcm,snd_rawmidi,s nd_seq,snd_timer,snd_seq_device
    i915 450944 2
    nouveau 621970 1
    ath9k 103633 0
    mac80211 257001 1 ath9k
    ttm 65184 1 nouveau
    soundcore 12600 1 snd
    snd_page_alloc 14073 2 snd_hda_intel,snd_pcm
    drm_kms_helper 40745 2 i915,nouveau
    ath9k_common 13611 1 ath9k
    ath9k_hw 300328 2 ath9k,ath9k_common
    drm 180037 6 i915,nouveau,ttm,drm_kms_helper
    uvcvideo 66851 0
    videodev 75143 1 uvcvideo
    xhci_hcd 68062 0
    ath 19141 2 ath9k,ath9k_hw
    i2c_algo_bit 13184 2 i915,nouveau
    psmouse 73312 0
    serio_raw 12990 0
    cfg80211 156212 3 ath9k,mac80211,ath
    video 18951 2 i915,nouveau
    sparse_keymap 13666 0
    lp 13349 0
    parport 36746 3 parport_pc,ppdev,lp
    usb_storage 43946 0
    uas 17676 0
    sdhci_pci 13623 0
    ahci 21591 2
    tg3 131476 0
    libahci 25548 1 ahci
    sdhci 22720 1 sdhci_pci



    Having same issue that will be kind of anyone who help me in this
    Jazak-Allah

  4. #4
    Join Date
    Oct 2010
    Beans
    16
    Distro
    Kubuntu 10.04 Lucid Lynx

    Re: Brightness Fn Keys Not Working

    posted same again sorry

  5. #5
    Join Date
    Jun 2005
    Location
    Toronto, Canada
    Beans
    Hidden!
    Distro
    Xubuntu 16.04 Xenial Xerus

    Re: Brightness Fn Keys Not Working

    Can you try these possible kernel parameters:

    acpi_osi=Linux
    acpi_backlight=vendor
    acpi_osi=Linux acpi_backlight=vendor

    Here are instructions on how to test them: https://help.ubuntu.com/community/Gr...nu_During_Boot

    Add those parameters, one at a time, to the end of the line starting "linux...", then press Ctrl+x to continue the boot process. Once you've booted in, for each command:
    1. check whether the function keys work and
    2. Save the results of:
    Code:
    cat /proc/cmdline
    Post back your findings.
    Last edited by Toz; March 25th, 2012 at 02:22 PM.

  6. #6
    Join Date
    Sep 2010
    Beans
    33

    Cool Re: Brightness Fn Keys Not Working

    Hey, there

    I did many attempts to make the function keys - and most of all - the brightness ones - work ... with no success ...
    as a result - the line in /etc/default/grub, that starts with GRUB_CMDLINE_LINUX_DEFAULT is:
    Code:
    GRUB_CMDLINE_LINUX_DEFAULT="quiet splash acpi_osi=Linux acpi_backlight=vendor"
    so ... do you have any idea what I can do about it? ...
    I'm with Ubuntu 12.04 on Toshiba P855-108.

    Thanks in advance

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