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Thread: Error when dim down dim down screen brightness

  1. #1
    Join Date
    Jun 2010

    Error when dim down dim down screen brightness

    I have an Dell Studio 1558, with a Mobility Radeon HD 4500/5100 Series.

    After a clean install of Ubuntu 12.04, I reboot it.
    And just like normal, I logged in my Ubuntu. And just like normal, the screen to bright, so I press "F4" to dim down the display. But when I press F4 again and again immediately (to dim down the brightness to 0), my laptop screen is turned off, I must shut down my laptop by pressing the power button!

    So I test it some more time and get the same result, I try to install the Additional Driver (ATI/AMD proprietary FGLRX), test it again, the screen not turned off but go...crazy, and I still need to shutdown my laptop.

    So I think this may due to the F4 key, I install "xbacklight" and use it to dim down my screen...when I try:
    xbacklight -set 50
    xbacklight -set 40
    xbacklight -set 30
    xbacklight -set 20
    xbacklight -set 10
    xbacklight -set 0
    I try to run these command as fast as I can (set and reset) and it still make my screen go crazy!

    Is this a bug?
    Is there any one get the same issue with me?

  2. #2
    Join Date
    May 2012

    Question Re: Error when dim down dim down screen brightness

    I'm also experiencing crashes/hangs when changing brightness (and also at random time).

    I have Dell Studio 1558 with Intel i5 M520 CPU and AMD Mobility Radeon 5470.

    Latest ubuntu 12.04 with all updates applied. I tried both the default open source driver that comes with Ubuntu as well as fglrx from AMD. In either case changing brightness hangs the machine. I was not able to install fglrx post-updates package as jockey errors out during install.

    What further information can I provide to have this issue looked at?

    PS. On the bright side, I'm able to take advantage of eyeFinity features of this laptop's video card. I'm able to run 3 monitors at once with Ubuntu (1x over HDMI, 1x over VGA, and the laptop screen). In Windows I can only run any 2 monitors out of the three. Dell says 3x monitors aren't supported by the videocard, AMD says I need latest drivers, but Dell no longer updates the video drivers for my laptop (haven't changed since 2010). Hence why I want to make Ubuntu work stable on this laptop.

  3. #3
    Join Date
    Dec 2008
    Ubuntu 14.04 Trusty Tahr

    Re: Error when dim down dim down screen brightness

    Same here with Ubuntu 12.04 and Studio 1558. It crashes when dimming the display brightness. Anyone found a solution ?

  4. #4
    Join Date
    Feb 2010

    Re: Error when dim down dim down screen brightness

    Same here: Dell Studio 1558 crashes and showing strange blinking patterns when trying to adjust brightness.

    Though it does not crash when the power adapter is not plugged in.

  5. #5
    Join Date
    Aug 2011

    Re: Error when dim down dim down screen brightness

    am also experiencing these errors(when dimming brightness) with my studio1558.
    And also the system get heated up rapidly and all process become slower than the normal condition..

  6. #6
    Join Date
    Nov 2009
    Space Coast, FL, USA
    Ubuntu 10.10 Maverick Meerkat

    Re: Error when dim down dim down screen brightness

    I may be way off base here, but I wonder if that laptop has a light sensor in it. I would look in the bios (f2 at dell boot screen) and see if there are any settings for using the automatic light sensor. Some of the dell laptops have that sensor and I'd bet that some linux kernels don't like playing nice with it. If you see a setting for an automatic light sensor, try turning them off to see what happens.

    I know it's not really a fix, but it could be a short-term workaround to stop a headache until the kernel drivers catch up.

    Good luck either way!


  7. #7
    Join Date
    Jun 2013

    Re: Error when dim down dim down screen brightness

    Same here. It crashed many times now it does not boots at all.


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