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Thread: Laptop screen backlight/brightness issues with 11.10

  1. #1
    Join Date
    Oct 2007
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    Laptop screen backlight/brightness issues with 11.10

    Hi,

    I previously used Xubuntu 9.10 32-bit, but recently started using Lubuntu 11.10 64-bit.

    I have a Lenovo 3000 N200 laptop with an Nvidia Geforce Go 7300 chip. It has 8 possible LCD backlight brightnesses; I'll refer to them as level 0 to 7 here.

    With Xubuntu 9.10, I could select any brightness easily. In Lubuntu 11.10 however, while the backlight controls still work (Fn-F10 and Fn-F11 on my keyboard), each press changes the brightness by two levels, like this when increasing the brightness:
    0 -> 2 -> 4 -> 6 -> 7
    and like this when decreasing:
    7 -> 5 -> 3 -> 1 -> 0

    So while I can still select any possible brightness level, it's a bit of a hassle. For example, to select brightness 5 I can change the brightness to maximum (7) then press Fn-F10 to reduce it to 5. To change from 5 to 4 I'd need to reduce it to 0 then press Fn-F11 twice to increase it to 2 then 4.

    This happens with both the Nouveau and Nvidia binary drivers. Has anyone else experienced a similar problem?

  2. #2
    Join Date
    Oct 2008
    Location
    Peterborough, ON
    Beans
    37
    Distro
    Ubuntu 10.04 Lucid Lynx

    Re: Laptop screen backlight/brightness issues with 11.10

    I was always under the impression that the screen brightness was controlled
    by the hardware and not the os, so even though Lubuntu
    is showing you going up 2 levels this may be more a glitch in the way Lubuntu is
    showing this information than what is really happening.

    This is just my opinion, I could be wrong.

  3. #3
    Join Date
    Nov 2010
    Beans
    12

    Re: Laptop screen backlight/brightness issues with 11.10

    I have the same problem with ubuntu 11.10 on a Lenovo T520 laptop. Is there a way to disable the hotkey? I don't need the OSD.

  4. #4
    Join Date
    Oct 2008
    Location
    Down Under
    Beans
    1,566
    Distro
    Xubuntu 12.10 Quantal Quetzal

    Re: Laptop screen backlight/brightness issues with 11.10

    Following this posting -
    http://ubuntuforums.org/showthread.php?t=1422861

    and thanks to Domu - You can check the keyboard shortcuts already set up by looking at the output of:
    Code:
    grep -A 2 "<keybind" ~/.config/openbox/lubuntu-rc.xml


    For How-To's, Information and Screen-Casts on Lubuntu go to the
    Lubuntu One Stop Thread -

    Lubuntu One Stop Thread

    Rodney

  5. #5
    Join Date
    Nov 2010
    Beans
    12

    Re: Laptop screen backlight/brightness issues with 11.10

    I removed all the parts related to backlight in the xml and it didn't work. I think the power-manager takes over the control for those keys. I tried Ubuntu, Kubuntu, Lubuntu, and Fedora. They all have the same problem. Fedora somehow has one more level of adjustment. The problem is probably lying deeper in the system...

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