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Thread: Screen backlight on battery not working

  1. #1
    Join Date
    May 2009
    Location
    Málaga, Spain
    Beans
    14
    Distro
    Ubuntu 10.04 Lucid Lynx

    Screen backlight on battery not working

    Good morning boys and girls:

    I am the proud owner of a Samsung r510 laptop running Lucid Lynx, with Intel graphics.

    I am not able to control brightness with Gnome's Power Manager, neither the brightness App does.

    When started with battery the screen's dimmed and there is nothing to do about it but boot with power and then disconnect it from the charger.

    Does any kind of fix exist?

    Thanks in advance.

  2. #2
    Join Date
    Apr 2010
    Location
    Switzerland
    Beans
    307
    Distro
    Ubuntu

    Re: Screen backlight on battery not working

    I have a Thinkpad T410, and I had to add some lines to /etc/X11/xorg.conf in order to get brightness control to work. It worked fine with nouveau, but not with the proprietary (evil) NVidia drivers.. Maybe you need to do something similiar.

    Code:
    Section "ServerLayout"
        Identifier     "Layout0"
        Screen      0  "Screen0" 0 0
        InputDevice    "Keyboard0" "CoreKeyboard"
        InputDevice    "Mouse0" "CorePointer"
    EndSection
    
    Section "Files"
    EndSection
    
    Section "InputDevice"
    
        # generated from default
        Identifier     "Mouse0"
        Driver         "mouse"
        Option         "Protocol" "auto"
        Option         "Device" "/dev/psaux"
        Option         "EmulateWheel" "on"
        Option         "EmulateWheelButton" "2"
        Option         "Emulate3Buttons" "no"
        Option         "ZAxisMapping" "4 5"
    EndSection
    
    Section "InputDevice"
    
        # generated from default
        Identifier     "Keyboard0"
        Driver         "kbd"
    EndSection
    
    Section "Monitor"
        Identifier     "Monitor0"
        VendorName     "Unknown"
        ModelName      "Unknown"
        HorizSync       28.0 - 33.0
        VertRefresh     43.0 - 72.0
        Option         "DPMS"
    EndSection
    
    Section "Device"
        Identifier     "Device0"
        Driver         "nvidia"
        VendorName     "NVIDIA Corporation"
    EndSection
    
    Section "Screen"
        Identifier     "Screen0"
        Device         "Device0"
        Monitor        "Monitor0"
        DefaultDepth    24
        Option         "RegistryDwords" "EnableBrightnessControl=1"
        SubSection     "Display"
            Depth       24
        EndSubSection
    EndSection
    Not a fix, but a workaround would be to disable the option "Reduce backlight brightness" in gnome's power settings. Then it should stop doing that.

  3. #3
    Join Date
    Oct 2009
    Location
    Bangalore, India
    Beans
    45
    Distro
    Ubuntu 10.04 Lucid Lynx

    Re: Screen backlight on battery not working

    None of that is necessary...

    just add the ppa on this website... https://launchpad.net/~voria/+archive/ppa

    then install the samsung-backlight package and a few of the other ones... (look at the description in synaptic and decide which ones you want).. after that you should be good to go...

    post on your results..

    oh... it might be easier if you look at the packages in the software center instead of synaptic...
    Last edited by ak123; July 5th, 2010 at 08:38 AM.

  4. #4
    Join Date
    May 2009
    Location
    Málaga, Spain
    Beans
    14
    Distro
    Ubuntu 10.04 Lucid Lynx

    Re: Screen backlight on battery not working

    Thanks for your quick response!

    Installing the packages did not solve it!

    samsung-tools package only activated the webcam hotkey...

  5. #5
    Join Date
    Oct 2009
    Location
    Bangalore, India
    Beans
    45
    Distro
    Ubuntu 10.04 Lucid Lynx

    Re: Screen backlight on battery not working

    hmmm.. its weird... the package suddenly stopped working after some update...now i dont have control...

    update: try running
    Code:
    sudo dpkg --configure -a
    worked for me...
    Last edited by ak123; July 10th, 2010 at 04:35 PM.

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