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Thread: brightness problem in laptop

  1. #1
    Join Date
    Jun 2011
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    India,Banglore
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    Ubuntu 11.10 Oneiric Ocelot

    Arrow brightness problem in laptop

    hi i just installed ubuntu 10.10 on my lenovo z 570 laptop. i am not able to change the screen brightness.even the function keys are not working. please help
    thanks.

  2. #2
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    Re: brightness problem in laptop

    Help?????????????

  3. #3
    Join Date
    May 2011
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    Re: brightness problem in laptop

    Have you tried through compiz config settings manager? (under accesibility section enable "opacity, saturation and brightness").

    If you don't have the compiz config settings manager you can download same via the ubuntu software center.

  4. #4
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    Re: brightness problem in laptop

    thanks for the reply ! i downloaded that software but i am unable to change it!. I changed it using the slider. is it right o is there an other way?? thanks

  5. #5
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    Re: brightness problem in laptop

    The second tab is "brightness".
    Press the first button (which says "increase brightness") and change the "disabled" to "enabled".

    This may get your keyboard keys functional again and you can change the brightness.

  6. #6
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    Re: brightness problem in laptop

    i did the steps that u specified. It asked me for a key configuration. I used function key with the lower brightness button . but it did not have any changes.
    But the function keys are working fine with sounds.

  7. #7
    Join Date
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    Xubuntu 14.04 Trusty Tahr

    Re: brightness problem in laptop

    If your system comes with an nvidia video card and you are using the proprietary driver, try adding:
    Code:
    Option "RegistryDwords" "EnableBrightnessControl=1"
    ...to the DEVICE section of your /etc/X11/xorg.conf file (logout and back in again to test).

    Otherwise, try booting with the following kernel parameters:
    - acpi_backlight=vendor
    - acpi_osi=Linux
    - acpi_osi=
    - acpi_osi=Linux acpi_backlight=vendor
    See here for instructions on how to test these parameters: https://help.ubuntu.com/community/Gr...nu_During_Boot

  8. #8
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    Re: brightness problem in laptop

    Quote Originally Posted by Toz View Post
    If your system comes with an nvidia video card and you are using the proprietary driver, try adding:
    Code:
    Option "RegistryDwords" "EnableBrightnessControl=1"
    ...to the DEVICE section of your /etc/X11/xorg.conf file (logout and back in again to test).

    Otherwise, try booting with the following kernel parameters:
    - acpi_backlight=vendor
    - acpi_osi=Linux
    - acpi_osi=
    - acpi_osi=Linux acpi_backlight=vendor
    See here for instructions on how to test these parameters: https://help.ubuntu.com/community/Gr...nu_During_Boot
    thanks for reply!

    yes i do have a nvidia g card, but i dont have any proprietary driver for that.

    But there is no file named xorg.conf

    And i tried these parameter as well they did not work.

  9. #9
    Join Date
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    Re: brightness problem in laptop

    Quote Originally Posted by KRISHNASHK View Post
    yes i do have a nvidia g card, but i dont have any proprietary driver for that.
    Do you have an option to install an nvidia driver in the Additional Drivers (Restricted Drivers) screen? See: https://help.ubuntu.com/community/Bi...erHowto/Nvidia

  10. #10
    Join Date
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    Re: brightness problem in laptop

    Quote Originally Posted by Toz View Post
    Do you have an option to install an nvidia driver in the Additional Drivers (Restricted Drivers) screen? See: https://help.ubuntu.com/community/Bi...erHowto/Nvidia
    no i just got an notification for broadcom driver for wifi, i just installed them. Now wen i hit additional driver only that broad com driver is shown up.



    and this is the output of grub file.


    # If you change this file, run 'update-grub' afterwards to update
    # /boot/grub/grub.cfg.

    GRUB_DEFAULT=0
    #GRUB_HIDDEN_TIMEOUT=0
    GRUB_HIDDEN_TIMEOUT_QUIET=true
    GRUB_TIMEOUT=10
    GRUB_DISTRIBUTOR=`lsb_release -i -s 2> /dev/null || echo Debian`
    GRUB_CMDLINE_LINUX_DEFAULT="quiet splash acpi_backlight=vendor"
    GRUB_CMDLINE_LINUX="acpi_osi=Linux acpi_backlight=vendor"

    # Uncomment to enable BadRAM filtering, modify to suit your needs
    # This works with Linux (no patch required) and with any kernel that obtains
    # the memory map information from GRUB (GNU Mach, kernel of FreeBSD ...)
    #GRUB_BADRAM="0x01234567,0xfefefefe,0x89abcdef,0xe fefefef"

    # Uncomment to disable graphical terminal (grub-pc only)
    #GRUB_TERMINAL=console

    # The resolution used on graphical terminal
    # note that you can use only modes which your graphic card supports via VBE
    # you can see them in real GRUB with the command `vbeinfo'
    #GRUB_GFXMODE=640x480

    # Uncomment if you don't want GRUB to pass "root=UUID=xxx" parameter to Linux
    #GRUB_DISABLE_LINUX_UUID=true

    # Uncomment to disable generation of recovery mode menu entries
    #GRUB_DISABLE_LINUX_RECOVERY="true"

    # Uncomment to get a beep at grub start
    #GRUB_INIT_TUNE="480 440 1"

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