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Thread: Inspiron 17r SE Can't adjust brightness

  1. #1
    Join Date
    Jul 2013
    Beans
    6

    Inspiron 17r SE Can't adjust brightness

    Hello,
    I can't adjust the brightness of my Dell Inspiron 17r SE running Ubuntu 12.04, but I can adjust it within being in the Grubbootloader.
    I think the problem is the nvidiadriver (I am running the latest version).
    Have you got an idea how to solve this problem?


    Here is the output of cat /etc/X11/xorg.conf:
    Code:
    # Warning: This file is autogenerated by nvidia-prime. All changes to this file will be lost.
    
    Section "ServerLayout"
        Identifier "layout"
        Screen 0 "nvidia"
        Inactive "intel"
    EndSection
    
    Section "Device"
        Identifier "nvidia"
        Driver "nvidia"
        BusID "1:0:0"
    EndSection
    
    Section "Screen"
        Identifier "nvidia"
        Device "nvidia"
        # Uncomment this line if your computer has no display devices connected to
        # the NVIDIA GPU.  Leave it commented if you have display devices
        # connected to the NVIDIA GPU that you would like to use.
        Option "UseDisplayDevice" "none"
    EndSection
    
    Section "Device"
        Identifier "intel"
        Driver "modesetting"
    EndSection
    
    Section "Screen"
        Identifier "intel"
        Device "intel"
    EndSection

  2. #2
    Join Date
    Jun 2005
    Location
    Toronto, Canada
    Beans
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    Distro
    Xubuntu 14.04 Trusty Tahr

    Re: Inspiron 17r SE Can't adjust brightness

    Hello and welcome to the forums.

    Try adding:
    Code:
     Option         "RegistryDwords" "EnableBrightnessControl=1"
    ...to the "nvidia" Device section of your x11 config file.

  3. #3
    Join Date
    Jun 2009
    Location
    Chicago Suburbs
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    Distro
    Ubuntu 12.04 Precise Pangolin

    Re: Inspiron 17r SE Can't adjust brightness

    Some discussion of a BIOS setting for other models of Dells.

    Ubuntu on the Precision M3800 or XPS15 Nov 2013
    http://en.community.dell.com/techcen...ion-m3800.aspx


    Running in legacy BIOS mode or in UEFI mode both work, but for now you'll need to enable "Legacy Option ROM" in the BIOS if you're running in UEFI mode because of the display's backlight. This is because of an issue with the Intel i915 driver that currently affects several systems from many vendors. If you don't enable this BIOS option, the backlight will be stuck at the lowest setting in Linux.
    For info on UEFI boot install & repair:
    http://ubuntuforums.org/showthread.php?t=2147295
    Please use Thread Tools above first post to close thread when/if answered completely.







  4. #4
    Join Date
    Jul 2013
    Beans
    6

    Re: Inspiron 17r SE Can't adjust brightness

    Thanks for your answers.
    But booth solutions did not work on my system.
    My brightness is always on max - I have got no idea how to fix this issue.

  5. #5
    Join Date
    Jun 2005
    Location
    Toronto, Canada
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    Distro
    Xubuntu 14.04 Trusty Tahr

    Re: Inspiron 17r SE Can't adjust brightness

    Can you post back the results of the following commands (run in a terminal window)?

    1. Your kernel boot line:
    Code:
    cat /proc/cmdline
    2. Info about your video card(s) and driver(s):
    Code:
    lspci -k | grep -iA2 VGA
    3. Your current backlight interfaces:
    Code:
    for i in /sys/class/backlight/*; do echo $i; cat $i/brightness; cat $i/actual_brightness; cat $i/max_brightness; done

  6. #6
    Join Date
    Jul 2013
    Beans
    6

    Re: Inspiron 17r SE Can't adjust brightness

    Here are the results of:

    1.cat /proc/cmdline:
    Code:
    BOOT_IMAGE=/boot/vmlinuz-3.8.0-34-generic root=UUID=4dec5347-59d9-4133-8424-f088380a301e ro quiet splash
    2. lspci -k | grep -iA2 VGA :
    Code:
    00:02.0 VGA compatible controller: Intel Corporation 3rd Gen Core processor Graphics Controller (rev 09)
        Subsystem: Dell Device 0578
        Kernel driver in use: i915
    --
    01:00.0 VGA compatible controller: NVIDIA Corporation GK107M [GeForce GT 650M] (rev a1)
        Subsystem: Dell Device 0578
        Kernel driver in use: nvidia
    3. for i in /sys/class/backlight/*; do echo $i; cat $i/brightness; cat $i/actual_brightness; cat $i/max_brightness; done :
    Code:
    /sys/class/backlight/acpi_video0
    0
    0
    15
    /sys/class/backlight/acpi_video1
    94
    94
    100
    /sys/class/backlight/intel_backlight
    402
    4575
    4882

  7. #7
    Join Date
    Jun 2005
    Location
    Toronto, Canada
    Beans
    Hidden!
    Distro
    Xubuntu 14.04 Trusty Tahr

    Re: Inspiron 17r SE Can't adjust brightness

    Which set of the following commands changes the brightness?

    Set #1:
    Code:
    echo 7 | sudo tee /sys/class/backlight/acpi_video0/brightness
    echo 0 | sudo tee /sys/class/backlight/acpi_video0/brightness
    Set #2:
    Code:
    echo 50 | sudo tee /sys/class/backlight/acpi_video1/brightness
    echo 100 | sudo tee /sys/class/backlight/acpi_video1/brightness
    Set #3:
    Code:
    echo 2441 | sudo tee /sys/class/backlight/intel_backlight/brightness
    echo 402 | sudo tee /sys/class/backlight/intel_backlight/brightness
    *Enter your password when prompted.

  8. #8
    Join Date
    Jul 2013
    Beans
    6

    Re: Inspiron 17r SE Can't adjust brightness

    Thank you for your quick reply.
    The following sets of commands changed the brightness: #2 and #3.

  9. #9
    Join Date
    Jun 2005
    Location
    Toronto, Canada
    Beans
    Hidden!
    Distro
    Xubuntu 14.04 Trusty Tahr

    Re: Inspiron 17r SE Can't adjust brightness

    Quote Originally Posted by z46fndR View Post
    Thank you for your quick reply.
    The following sets of commands changed the brightness: #2 and #3.
    Two suggestions to try.

    First, try forcing the intel_backlight interface by adding:
    Code:
    Option      "Backlight"  "intel_backlight"
    ...to both of the Device sections in /etc/X11/xorg.conf, like this:
    Code:
    Section "Device"
        Identifier "nvidia"
        Driver "nvidia"
        BusID "1:0:0"
        Option      "Backlight"  "intel_backlight"
    EndSection
    Code:
    Section "Device"
        Identifier "intel"
        Driver "modesetting"
        Option      "Backlight"  "intel_backlight"
    EndSection
    ...log out and back in again to test.


    If that doesn't work, then remove those additions and give the acpi_backlight=vendor kernel parameter a try.
    1. Edit the grub configuration file:
    Code:
    sudo -i gedit /etc/default/grub
    2. Change the line that reads:
    GRUB_CMDLINE_LINUX=""
    ...to read:
    Code:
    GRUB_CMDLINE_LINUX="acpi_backlight=vendor
    3. Save the file and commit the change:
    Code:
    sudo update-grub
    4. Reboot.

    On reboot, test the brightness function keys and post back again:
    Code:
    cat /proc/cmdline
    Code:
    for i in /sys/class/backlight/*; do echo $i; cat $i/brightness; cat $i/actual_brightness; cat $i/max_brightness; done

  10. #10
    Join Date
    Jul 2013
    Beans
    6

    Re: Inspiron 17r SE Can't adjust brightness

    Solution 1 and 2 didn't really work, 2 just set me my brightness lower, but I still can't adjust it...
    Result of cat /proc/cmdline:
    Code:
    BOOT_IMAGE=/boot/vmlinuz-3.8.0-34-generic root=UUID=4dec5347-59d9-4133-8424-f088380a301e ro acpi_backlight=vendor quiet splash
    Result of for i in /sys/class/backlight/*; do echo $i; cat $i/brightness; cat $i/actual_brightness; cat $i/max_brightness; done
    Code:
    /sys/class/backlight/dell_backlight
    15
    15
    15
    /sys/class/backlight/intel_backlight
    402
    402
    4882

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