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

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  1. #1
    Join Date
    Jan 2011
    Beans
    19

    Unhappy Changing brightness does not work in Ubuntu 11.10 after upgrading.

    Hello,
    I
    After upgrading to Ubuntu 11.10 in my Sony Vaio Laptop(VGN-CS) and using Unity as a desktop environment,increasing and decreasing brightness via fn+f5 and fn+f6 does not worked any more.
    I remember that i did not installed any NVIDIA driver in my laptop,
    but it seems that Ubunut itself installed it in new version after upgrading to 11.10.
    I also test http://ubuntuguide.net/change-screen...ntu-11-0410-10,but it does not work.
    I can not worked with my laptop any more because brightness of my
    screen is too high now.

    Khosro.
    Last edited by khosro; November 4th, 2011 at 03:42 PM.

  2. #2
    Join Date
    Nov 2010
    Location
    Foshan, China
    Beans
    437
    Distro
    Ubuntu 12.04 Precise Pangolin

    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 ?

  3. #3
    Join Date
    Jan 2011
    Beans
    19

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

    Yes ,it is.
    I have attached a related screenshot picture.

    Khosro.
    Attached Images Attached Images

  4. #4
    Join Date
    May 2010
    Location
    uk
    Beans
    9,351
    Distro
    Xubuntu 14.04 Trusty Tahr

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

    Hi

    What is the make and model of your latop and graphics card ?

    Open a terminal and type

    Code:
    ls /sys/class/backlight
    Copy and paste the results back here.

    Then type

    Code:
    lsmod | grep video
    and do the same thing.

    Lastly

    Code:
    cat /proc/cmdline
    Post back as well.

    Kind regards
    If you believe everything you read, you better not read. ~ Japanese Proverb

    If you don't read the newspaper, you're uninformed. If you read the newspaper, you're mis-informed. - Mark Twain

    Thinking about becoming an Ubuntu Member?

  5. #5
    Join Date
    Jan 2011
    Beans
    19

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

    Hi matt_symes,
    My laptop is Sony Vaio VGN-CS and graphic cards is NVIDIA.

    The following is the commands and also output that you asked me to run :

    Code:
    khosro@khosro-laptop:~$ ls /sys/class/backlight
    sony
    
    khosro@khosro-laptop:~$ lsmod | grep video
    uvcvideo               72711  0 
    videodev               93004  1 uvcvideo
    v4l2_compat_ioctl32    17083  1 videodev
    video                  19412  0 
    
    khosro@khosro-laptop:~$ cat /proc/cmdline
    BOOT_IMAGE=/boot/vmlinuz-3.0.0-12-generic root=UUID=0095c4f7-3bae-490d-be19-3f907855199c ro quiet splash vt.handoff=7
    Khosro.

  6. #6
    Join Date
    May 2010
    Location
    uk
    Beans
    9,351
    Distro
    Xubuntu 14.04 Trusty Tahr

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

    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
    Last edited by matt_symes; November 4th, 2011 at 05:34 PM.
    If you believe everything you read, you better not read. ~ Japanese Proverb

    If you don't read the newspaper, you're uninformed. If you read the newspaper, you're mis-informed. - Mark Twain

    Thinking about becoming an Ubuntu Member?

  7. #7
    Join Date
    Apr 2013
    Beans
    4

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

    Hello, I have installed Ubuntu 12.04 and I have the same problem. I migrated from mac and even though I don't have all the basic knowledge in order to 'self install' everything I need yet, I believe the best way to do it is trying.

    To the lio, this is the output I get:

    username@computersname-MacBook:~$ ls /sys/class/backlight
    apple_backlight
    username@computersname-MacBook:~$ lsmod | grep video
    uvcvideo 72249 0
    videobuf2_core 32212 1 uvcvideo
    videodev 100265 2 uvcvideo,videobuf2_core
    videobuf2_vmalloc 12757 1 uvcvideo
    videobuf2_memops 13213 1 videobuf2_vmalloc
    username@computersname-MacBook:~$ cat /proc/cmdline
    BOOT_IMAGE=/boot/vmlinuz-3.5.0-27-generic root=UUID=5f59014a-f5f9-4946-986d-652003df4751 ro quiet splash vt.handoff=7
    username@computersname-MacBook:~$ sudo nano ect/default/grub



    I tryied changing the grub and nothing and when I try 'sudo nano ect/default/grub' the file does not exist.

    I need some help with this please. Thank you

  8. #8
    Join Date
    Jul 2007
    Location
    Magic City of the Plains
    Beans
    Hidden!
    Distro
    Xubuntu 15.10 Wily Werewolf

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

    chessmate, you're more likely to get help if you start a new thread.

  9. #9
    Join Date
    Apr 2013
    Beans
    4

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

    Thank you odos2er, I believe this thread is ended.?

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