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Thread: Screen Dimness/Brightness Problem Ubuntu 13.04 Dell XPS 13 2013

  1. #1
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    Screen Dimness/Brightness Problem Ubuntu 13.04 Dell XPS 13 2013

    I just bought a new Dell XPS 13 Ultrabook and installed Xubuntu 13.04 tonight.

    When I boot up, the screen brightness is EXTREMELY dim, to the point where I can barely see anything.

    Adjusting the screen brightness doesn't do anything. This is obviously a very new bug with 13.04, but any assistance would be greatly appreciated.

    RDP1976

  2. #2
    Join Date
    Jun 2005
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    Toronto, Canada
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    Xubuntu Development Release

    Re: Screen Dimness/Brightness Problem Ubuntu 13.04 Dell XPS 13 2013

    Hello and welcome to the forums.

    Have a look at this bug report: https://bugs.launchpad.net/ubuntu/+s...ux/+bug/954661.
    Comment #43 suggests that:
    Code:
    echo 0 | sudo tee /sys/class/backlight/intel_backlight/brightness
    ...fixes the problem. Perhaps you can give this a try.

    If it does work, the command posted in post #43:
    Code:
    /bin/echo 0 > /sys/class/backlight/intel_backlight/brightness
    ...should be added to /etc/rc.local above the "Exit 0" command.

    The bug report also indicates that its been fixed in 3.8.0-18.28. Which kernel version do you have installed?

  3. #3
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    Re: Screen Dimness/Brightness Problem Ubuntu 13.04 Dell XPS 13 2013

    Thanks for your response. Unfortunately it didn't fix the issue:


    My kernel version is: 3.8.0-19-generic

  4. #4
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    Apr 2013
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    Re: Screen Dimness/Brightness Problem Ubuntu 13.04 Dell XPS 13 2013

    I tried running the command manually and I also added the following to /etc/rc.local before exit 0:

    No change.


    /bin/echo 0 > /sys/class/backlight/intel_backlight/brightness

  5. #5
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    Ubuntu Development Release

    Re: Screen Dimness/Brightness Problem Ubuntu 13.04 Dell XPS 13 2013

    Idea... You first really need to verify that that directory path exists for you. You need to adapt that command to the directory structure of "your" system. That is the basic structure if your system has an Intel GPU. Go into Nautilus or command line and trace the tree down /sys/class/backlight/ and see what directories ar ender that that would indicate a GPU type name... Different systems with different GPU's have different names under that directory path.

    Your going to see something similar to this... with whatever that "_GPU_directory_name_" below backlight, varied to what your gpu is...
    Code:
    /sys/class/backlight/acpi_video0/actual_brightness:10
    /sys/class/backlight/acpi_video0/bl_power:0
    /sys/class/backlight/acpi_video0/brightness:10
    /sys/class/backlight/acpi_video0/max_brightness:10
    
    As you can see, after that directory name, you will then see a four registry files named: actual_brightness, bl_power, brightness and max_brightness... each containing numeric values

    First check the value in your registry via (remember to substitute for the directory name on yours):
    Code:
    cat /sys/class/backlight/_GPU_directory_name_/backlight
    The try changing the value and then check that value again to verify that it did change that registry entry...

    Play with the values, noting that some laptops (Acer is one) have their values flipped. I have one where the values and controls work in reverse. <Fn><Up> is supposed to get brighter, and on mine <Fn><Down> is brighter...

    If it changes the values in the brightness registry file, but does not affect the brightness of the hardware, then report it to launchpad.

    Is that enough info?
    #Note to Apple users- That won't work for you because of a bug with the ACPI Interface. Change yours in MACX and reboot into Ubuntu. It will read the persistent change from the system hardware.
    Last edited by MAFoElffen; April 28th, 2013 at 07:38 AM.
    Multi-Boot= Various flavours of Windows, Linux and Unix... Ubuntu user # 33563, Linux user # 533637
    Sticky: [all variants] Graphics Resolution- Upgrade /Blank Screen after reboot
    Boot Info Script courtesy of community member meierfra

  6. #6
    Join Date
    Apr 2013
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    Re: Screen Dimness/Brightness Problem Ubuntu 13.04 Dell XPS 13 2013

    When I activated Windows 8 (it was not activated for the new SSD I'd installed), the boot records were messed up. I had to do a full re-install of everything.

    I used the exact same Xubuntu 13.04 USB I used the first time, and this time around the dimness problem was gone. I don't know what fixed it or how, but the problem is gone.

    Thanks for your help.

  7. #7
    Join Date
    Dec 2007
    Location
    Russia
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    14
    Distro
    Ubuntu 8.10 Intrepid Ibex

    Re: Screen Dimness/Brightness Problem Ubuntu 13.04 Dell XPS 13 2013

    Echoing 0 sets my screen to black, so I changed the number to something bigger
    Code:
     echo 4000 > /sys/class/backlight/intel_backlight/brightness
    That fixed my brightness problem on Dell notebook.

  8. #8
    Join Date
    Jun 2013
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    1

    Re: Screen Dimness/Brightness Problem Ubuntu 13.04 Dell XPS 13 2013

    Does Ubuntu 13.04 install wifi drivers automatically on dell xps 13 ...

  9. #9
    Join Date
    Nov 2007
    Beans
    7

    Re: Screen Dimness/Brightness Problem Ubuntu 13.04 Dell XPS 13 2013

    Have a look at this bug report: https://bugs.launchpad.net/ubuntu/+s...ux/+bug/954661.
    Comment #43 suggests that:
    Code:
    echo 0 | sudo tee /sys/class/backlight/intel_backlight/brightness
    ...fixes the problem. Perhaps you can give this a try.

    If it does work, the command posted in post #43:
    Code:
    /bin/echo 0 > /sys/class/backlight/intel_backlight/brightness
    ...should be added to /etc/rc.local above the "Exit 0" command.

    The bug report also indicates that its been fixed in 3.8.0-18.28.

    This worked for me thank you @Tos.
    Dell XPS 13 Intel® Core™ i7-3537U CPU @ 2.00GHz × 4
    Intel® Ivybridge Mobile
    3.8.0-23-generic #34-Ubuntu SMP Wed May 29 20:22:58 UTC 2013 x86_64 x86_64 x86_64 GNU/Linux
    Last edited by aspiteri; June 12th, 2013 at 01:32 AM.

  10. #10
    Join Date
    Nov 2007
    Beans
    7

    Re: Screen Dimness/Brightness Problem Ubuntu 13.04 Dell XPS 13 2013

    @azeem657 re:
    Does Ubuntu 13.04 install wifi drivers automatically on dell xps 13 ...

    It did for mine:
    Dell XPS 13 Intel® Core™ i7-3537U CPU @ 2.00GHz × 4
    Intel® Ivybridge Mobile
    3.8.0-23-generic #34-Ubuntu SMP Wed May 29 20:22:58 UTC 2013 x86_64 x86_64 x86_64 GNU/Linux
    Last edited by aspiteri; June 12th, 2013 at 01:30 AM.

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