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Thread: Thinkpad T410 - Fn+light not working

  1. #1

    Default Thinkpad T410 - Fn+light not working

    Installed opensuse 11.4 KDE into my Thinkpad T410.

    Noticed that pressing Fn+Home(+brightness) and Fn+End(-brightness) has no effect to the brightness setting at all.

    Any idea what I should set?

  2. #2

    Default Re: Thinkpad T410 - Fn+light not working

    Have been quite some time now, anyone comes across a solution?

  3. #3
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    Default Re: Thinkpad T410 - Fn+light not working

    I remember a thread on this topic (but openSUSE 11.3):

    OpenSUSE 11.3 Lenovo T410 Brightness Control Not Working

    Do you have the 'thinkpad-acpi' module loaded?

    Code:
    lsmod | grep thinkpad
    More on this here:

    Thinkpad-acpi - ThinkWiki

  4. #4

    Default Re: Thinkpad T410 - Fn+light not working

    Thinkpad acpi seems to be loaded

    lsmod | grep thinkpad

    thinkpad_acpi 79409 0
    But brightness control still not working

  5. #5

    Default Re: Thinkpad T410 - Fn+light not working

    Update for future users:

    Out of frustration, I did something that others had done but found it not effective

    kdesu nvidia-xconfig

    this creates the file /etc/X11/xorg.conf

    then edit this file in terminal
    vi /etc/X11/xorg.conf

    adding Option "RegistryDwords" "EnableBrightnessControl=1"

    effectively the affected section looks like this


    ......
    ......
    EndSection

    Section "Device"
    Identifier "Device0"
    Driver "nvidia"
    VendorName "NVIDIA Corporation"
    Option "RegistryDwords" "EnableBrightnessControl=1"
    EndSection

    Section "Screen"
    .....
    ....
    reboot and brightness control works !!


    Hope this update is useful.

  6. #6
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    Default Re: Thinkpad T410 - Fn+light not working

    Thanks for the update. Yes, I've seen (and suggested) that NVIDIA-sepcific option before for 'screen blanking' and 'brightness' issues (related to some power state changing quirk of some nvidia graphics hardware). It's important to note that you have to be using the proprietary nvidia driver (as opposed to the nv or nouveau drivers). Glad that it worked for you.
    Last edited by deano_ferrari; 18-Jun-2011 at 18:43.

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