Page 3 of 5 FirstFirst 12345 LastLast
Results 21 to 30 of 48

Thread: Changing brightness does not work in Ubuntu 11.10 after upgrading.

  1. #21
    Join Date
    Jun 2006
    Location
    Brisbane Australia
    Beans
    713

    Re: Changing brightness does not work in Ubuntu 11.10 after upgrading.

    I have had a Dell laptop updated with each Ubuntu version for years as a clean install. Brightness control has always worked (with some slight issues) except for Ubuntu 11.10 so I suspected something was broken in Ubuntu although I could not find an exactly similar problem around the forums. I eventually thought to update the bios version in my laptop and then brightness control worked fine. So something did change in Ubuntu 11.10 (or 11.04 which I skipped), but an updated bios may fix some peoples brightness control issues?

  2. #22
    Join Date
    Nov 2008
    Beans
    88

    Re: Changing brightness does not work in Ubuntu 11.10 after upgrading.

    So I have a problem I have the "xorg.conf" file in addition to the "xorg.conf.backup" file and others.

    I have attached a screen shot.

    I was thinking of deleting the others as they are updates and only keeping "xorg.conf.backup" as that seems to be the one I'm supposed to have and editing that.

    Should I uninstall nvidia as well? My fn keys do work in so far as they show the brightness meter go up and down, but the brightness it self doesn't change.

    Advice?

    http://ubuntuforums.org/showthread.php?t=1680872

    The advice in the above link worked for me, a little long but it worked, follow it verrrry carfully.
    Attached Images Attached Images
    Last edited by WaNaBePi; February 24th, 2012 at 09:00 AM. Reason: solved

  3. #23
    Join Date
    Mar 2012
    Beans
    1

    Re: Changing brightness does not work in Ubuntu 11.10 after upgrading.

    Quote Originally Posted by matt_symes View Post
    Hi

    Open a terminal and type

    Code:
    sudo nano /etc/default/grub
    Enter your password. It will not be echoed to the screen.

    Look for the line that says

    GRUB_CMDLINE_LINUX_DEFAULT="quiet splash"

    and change it so it says

    Code:
    GRUB_CMDLINE_LINUX_DEFAULT="quiet splash acpi_backlight=vendor"
    Press ctrl + o to save and ctrl + x to exit.

    Then type

    Code:
    sudo update-grub
    Reboot your PC and check your function keys. Post back if it doesn't work.

    Edit: Just in case you missed it i have highlighted what you need to enter.

    Kind regards
    This fixed the problem for me on a Dell XPS L401x.

    Thank you!!

  4. #24
    Join Date
    Sep 2008
    Location
    France
    Beans
    39
    Distro
    Ubuntu 10.10 Maverick Meerkat

    Thumbs down Re: Changing brightness does not work in Ubuntu 11.10 after upgrading.

    Hi, I have the same problem, have tried all the solutions, nothing working. I can't handle this brightness, my eyes hurt, is there anything else I can try?

    Sony Vaio E series, 11.10 unity.
    Last edited by fallenstar; March 14th, 2012 at 04:10 AM. Reason: Absent Minded Bear

  5. #25
    Join Date
    Mar 2012
    Beans
    2

    Re: Changing brightness does not work in Ubuntu 11.10 after upgrading.

    If you open "Additional Drivers", does it say that the NVIDIA driver is currently activated ? goldfish

  6. #26
    Join Date
    Sep 2008
    Location
    France
    Beans
    39
    Distro
    Ubuntu 10.10 Maverick Meerkat

    Re: Changing brightness does not work in Ubuntu 11.10 after upgrading.

    Quote Originally Posted by tippf2011 View Post
    If you open "Additional Drivers", does it say that the NVIDIA driver is currently activated ? goldfish
    Yes, the NVIDIA accelerated graphics driver (version current) [recommended]

    is activated and currently in use. Should I try the other

    NVIDIA accelerated graphics driver (post-release updates) (version current-updates)

    ????

    Will my laptop spontaneously combust, or never come back to life?


  7. #27
    Join Date
    Sep 2008
    Location
    France
    Beans
    39
    Distro
    Ubuntu 10.10 Maverick Meerkat

    Re: Changing brightness does not work in Ubuntu 11.10 after upgrading.

    Changed the driver to the post release nvidia, no difference. Installed xbacklight, ran it from terminal, nada. Before the above work arounds I at least had a little gui that displayed the level of backlight, despite not affecting it. Reversed the workarounds, can't get it back.

  8. #28
    Join Date
    Sep 2008
    Location
    France
    Beans
    39
    Distro
    Ubuntu 10.10 Maverick Meerkat

    Re: Changing brightness does not work in Ubuntu 11.10 after upgrading.

    this is a bug fix but it only works on certain NVIDIA cards:

    https://bugs.launchpad.net/ubuntu/+s...tup/+bug/95444

  9. #29
    Join Date
    Jan 2011
    Beans
    19

    Re: Changing brightness does not work in Ubuntu 11.10 after upgrading.

    Really bad,i am really disappointed using Ubuntu,because after upgrading to 12.04 increasing and decreasing brightness does not work any more.In 11.04 it worked if i uninstall NVIDIA driver but in 12.04 it does not work anymore at all.

    Khosro.

  10. #30
    Join Date
    Oct 2007
    Beans
    23

    Re: Changing brightness does not work in Ubuntu 11.10 after upgrading.

    Quote Originally Posted by matt_symes View Post
    Hi

    Open a terminal and type

    Code:
    sudo nano /etc/default/grub
    Enter your password. It will not be echoed to the screen.

    Look for the line that says

    GRUB_CMDLINE_LINUX_DEFAULT="quiet splash"

    and change it so it says

    Code:
    GRUB_CMDLINE_LINUX_DEFAULT="quiet splash acpi_backlight=vendor"
    Press ctrl + o to save and ctrl + x to exit.

    Then type

    Code:
    sudo update-grub
    Reboot your PC and check your function keys. Post back if it doesn't work.

    Edit: Just in case you missed it i have highlighted what you need to enter.

    Kind regards
    This solved my problem. I hava a Toshiba portege R830 with ubuntu 11.04 and after an update the brightness stopped working.

    Thanks matt for the solution, and the original thread creator fos posting the question.

Page 3 of 5 FirstFirst 12345 LastLast

Tags for this Thread

Bookmarks

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •