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Thread: Brightness controls not working

  1. #1
    Join Date
    Aug 2008
    Location
    Senegal
    Beans
    Hidden!
    Distro
    Ubuntu 18.04 Bionic Beaver

    Question Brightness controls not working

    Hi,
    I can't change the brigthness on the screen when I use the Fn option. I can see the control is changing but the brightness stays the same.
    I noticed this is a very common problem, but everyone seems to have small different aspects of the issue, so I don't want to try a solution that's not correspondent to me. (I learned that lesson the hard way).


    I have a Dell Inspiron 15R (5521) 64bit, Intel Core i5.
    Ubuntu 14.04 fresh install.

    Here is more info:

    Imput:
    Code:
    cat /proc/cmdline
    Output:
    Code:
    BOOT_IMAGE=/boot/vmlinuz-3.13.0-24-generic root=UUID=6bcf494c-b966-428b-8b27-3799ada2af74 ro quiet splash vt.handoff=7
    Imput:
    Code:
    lspci -k | grep -iA2 VGA
    Output:
    Code:
    00:02.0 VGA compatible controller: Intel Corporation 3rd Gen Core processor Graphics Controller (rev 09)
    	Subsystem: Dell Device 0597
    	Kernel driver in use: i915
    Imput:
    Code:
    for interface in /sys/class/backlight/*; do echo -e "\n $interface"; cat $interface/{brightness,max_brightness,actual_brightness}; done
    Output:
    Code:
     /sys/class/backlight/acpi_video0
    99
    99
    99
    
     /sys/class/backlight/intel_backlight
    1455
    4882
    1455
    Imput:
    Code:
    lsmod
    Output:
    Code:
    Module                  Size  Used by
    ctr                    13049  2 
    ccm                    17773  2 
    bnep                   19624  2 
    rfcomm                 69160  8 
    snd_hda_codec_hdmi     46207  1 
    joydev                 17381  0 
    snd_hda_codec_realtek    61438  1 
    dell_wmi               12761  0 
    sparse_keymap          13948  1 dell_wmi
    rts5139               335409  0 
    uvcvideo               80885  0 
    intel_rapl             18773  0 
    arc4                   12608  2 
    videobuf2_vmalloc      13216  1 uvcvideo
    videobuf2_memops       13362  1 videobuf2_vmalloc
    videobuf2_core         40664  1 uvcvideo
    x86_pkg_temp_thermal    14205  0 
    iwldvm                232285  0 
    videodev              134688  2 uvcvideo,videobuf2_core
    intel_powerclamp       14705  0 
    mac80211              626489  1 iwldvm
    coretemp               13435  0 
    kvm_intel             143060  0 
    kvm                   451511  1 kvm_intel
    snd_hda_intel          52355  3 
    btusb                  32412  0 
    crct10dif_pclmul       14289  0 
    snd_hda_codec         192906  3 snd_hda_codec_realtek,snd_hda_codec_hdmi,snd_hda_intel
    iwlwifi               169932  1 iwldvm
    crc32_pclmul           13113  0 
    ghash_clmulni_intel    13259  0 
    bluetooth             395423  22 bnep,btusb,rfcomm
    binfmt_misc            17468  1 
    snd_hwdep              13602  1 snd_hda_codec
    snd_pcm               102099  3 snd_hda_codec_hdmi,snd_hda_codec,snd_hda_intel
    snd_page_alloc         18710  2 snd_pcm,snd_hda_intel
    snd_seq_midi           13324  0 
    snd_seq_midi_event     14899  1 snd_seq_midi
    snd_rawmidi            30144  1 snd_seq_midi
    cfg80211              484040  3 iwlwifi,mac80211,iwldvm
    snd_seq                61560  2 snd_seq_midi_event,snd_seq_midi
    mei_me                 18627  0 
    snd_seq_device         14497  3 snd_seq,snd_rawmidi,snd_seq_midi
    snd_timer              29482  2 snd_pcm,snd_seq
    dell_laptop            18168  0 
    aesni_intel            55624  4 
    aes_x86_64             17131  1 aesni_intel
    wmi                    19177  1 dell_wmi
    i915                  783485  4 
    lrw                    13286  1 aesni_intel
    snd                    69238  17 snd_hda_codec_realtek,snd_hwdep,snd_timer,snd_hda_codec_hdmi,snd_pcm,snd_seq,snd_rawmidi,snd_hda_codec,snd_hda_intel,snd_seq_device,snd_seq_midi
    gf128mul               14951  1 lrw
    mei                    82274  1 mei_me
    glue_helper            13990  1 aesni_intel
    drm_kms_helper         52758  1 i915
    soundcore              12680  1 snd
    ablk_helper            13597  1 aesni_intel
    drm                   302817  5 i915,drm_kms_helper
    cryptd                 20359  3 ghash_clmulni_intel,aesni_intel,ablk_helper
    i2c_algo_bit           13413  1 i915
    dcdbas                 14928  1 dell_laptop
    lpc_ich                21080  0 
    psmouse               102222  0 
    video                  19476  1 i915
    serio_raw              13462  0 
    mac_hid                13205  0 
    parport_pc             32701  0 
    ppdev                  17671  0 
    lp                     17759  0 
    parport                42348  3 lp,ppdev,parport_pc
    hid_generic            12548  0 
    usbhid                 52616  0 
    hid                   106148  2 hid_generic,usbhid
    ahci                   25819  3 
    r8169                  67581  0 
    libahci                32168  1 ahci
    mii                    13934  1 r8169
    Imput:
    Code:
    pastebinit /var/log/Xorg.0.log
    Output:
    Code:
    http://paste.ubuntu.com/7330088/
    <><

  2. #2
    Join Date
    Jan 2009
    Location
    India
    Beans
    19
    Distro
    Ubuntu 14.04 Trusty Tahr

    Re: Brightness controls not working

    I had this issue in my Lenovo laptop. Seems same issue. See my question thread.

    http://ubuntuforums.org/showthread.php?t=2216441

  3. #3
    Join Date
    Aug 2008
    Location
    Senegal
    Beans
    Hidden!
    Distro
    Ubuntu 18.04 Bionic Beaver

    Re: Brightness controls not working

    It works, thank you !
    <><

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