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Thread: ThinkPad T410 Screen Brightness

  1. #1
    Join Date
    Mar 2005
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    277

    ThinkPad T410 Screen Brightness

    I'm having a little trouble with the screen brightness of my new thinkpad T410. Using the hotkeys (fn + Home or fn + End) the applet shows that the screen brightness is changing, however the brightness stays at maximum. I'm running Ubuntu 9.10, with 2.6.32-19. Has anyone had a similar problem? Also the screen brightness applet in gnome does not have any affect.

    Thanks in advance.
    ThinkPad T410: Core i7@2.66Ghz, NVIDIA NVS 3100m 256Mb, 4GB Ram, 500GB HDD, BT, a/b/g/n wifi
    ThinkPad R61: Core 2 Duo T8100@2.1Ghz, Intel X3100, 3GB Ram, 160GB HDD, 6cell Battery, 14inch WXGA.

  2. #2
    Join Date
    Sep 2005
    Location
    Toronto, ON, Canada
    Beans
    68
    Distro
    Ubuntu 9.10 Karmic Koala

    Re: ThinkPad T410 Screen Brightness

    I am having this problem too, since activating the nvidia proprietary drivers. Brightness worked fine before I did so.

  3. #3
    Join Date
    Mar 2005
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    277

    Re: ThinkPad T410 Screen Brightness

    There is some more discussion on the T410 in this thread:

    http://ubuntuforums.org/showthread.php?t=1383110&page=1

    Doesn't look like too many people have the nvidia graphics card, though but hopefully a solution will present itself.
    ThinkPad T410: Core i7@2.66Ghz, NVIDIA NVS 3100m 256Mb, 4GB Ram, 500GB HDD, BT, a/b/g/n wifi
    ThinkPad R61: Core 2 Duo T8100@2.1Ghz, Intel X3100, 3GB Ram, 160GB HDD, 6cell Battery, 14inch WXGA.

  4. #4
    Join Date
    Apr 2009
    Location
    Japan
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    204

    Re: ThinkPad T410 Screen Brightness

    Do you mind opening a bug on launchpad to troubleshoot the issue? The model is very new.

    https://bugs.launchpad.net/ubuntu/+filebug/?no-redirect

    There is an unrelated bug report with an Intel Corporation Core Processor Integrated Graphics Controller

    https://bugs.launchpad.net/ubuntu/+s...el/+bug/518201

    Nothing about FN keys/panel applet (+nvidia card) not working so far

    Workaround: can you change the brightness either entering the BIOS menu at boot-time, either entering a tty console after log-in to GNOME?

    Enter a console
    Code:
    Ctrl+Alt+F2
    Exit the console
    Code:
    Ctrl+Alt+F7

  5. #5
    Join Date
    Jun 2010
    Beans
    6

    Re: ThinkPad T410 Screen Brightness

    I have the same problem (brightness function keys display an onscreen applet that ramps a brightness display up and down, but has no effect on the actual screen brightness). System: Ubuntu 10.04 on Lenovo T410 core i5 with nVidia NV34 graphics (GeForce FX 5200); nVidia proprietary drivers.

    I can confirm that the workaround (switch to a console with CTRL/ALT/F1, adjust brightness, switch back with CTRL/ALT/F7) works just fine. Many thanks for that.

  6. #6
    Join Date
    Nov 2006
    Beans
    1

    Re: ThinkPad T410 Screen Brightness

    Same problem here, started when I installed the nvidia proprietary driver. Running 10.4 on T410. The switch to console, change brightness, switch back trick works, but is pretty annoying.

  7. #7
    Join Date
    Aug 2010
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    2

    Re: ThinkPad T410 Screen Brightness

    Did someone find solution? Have the same problem running 10.04 on t410

  8. #8
    Join Date
    Apr 2009
    Location
    Japan
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    204

    Re: ThinkPad T410 Screen Brightness

    Quote Originally Posted by rifcoder View Post
    Did someone find solution? Have the same problem running 10.04 on t410
    Solution: uninstall the nVidia proprietary driver.
    # rm -rf earth/usa/washington/redmond/m$

  9. #9
    Join Date
    Sep 2010
    Location
    Quebec, Quebec, Canada
    Beans
    2

    Re: ThinkPad T410 Screen Brightness

    same problem with ThinkPad T510 + nvidia proprietary driver.

  10. #10
    Join Date
    Feb 2010
    Beans
    16

    Re: ThinkPad T410 Screen Brightness

    look no further thinkpad users! The solution is simple!

    from http://ubuntuforums.org/showthread.p...79#post9494941

    Quote Originally Posted by BennBuntu View Post
    [...] Have to add
    Code:
    Option "RegistryDwords" "EnableBrightnessControl=1"
    to your /etc/X11/xorg.conf under devices section. Make sure the quotation marks are the same as if you type them.

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