Thursday, June 7, 2012

Ubuntu 12.04: Brightness buttons not working HP dv7-6190ed

In Ubuntu 12.04 the screen brightness up/down seems not to work for  HP dv7-6190ed and a few other models.

A general fix for most of the laptops with this problem: (does not work on all laptops)

Edit the file: /etc/default/grub

Ctrl+Alt+T to open terminal screeen
gksu gedit /etc/default/grub

Change this line:

GRUB_CMDLINE_LINUX_DEFAULT="quiet splash"


To:

GRUB_CMDLINE_LINUX_DEFAULT="quiet splash acpi_backlight=vendor"


Save the file and Reboot the system. It should fix the brightness up/down buttons.
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4 comments:

  1. AnonymousJuly 22, 2012 at 7:23:00 AM GMT+2

    i did it but they are not still working ,i am using hp G62

    ReplyDelete
    Replies
    1. marioJuly 22, 2012 at 4:10:00 PM GMT+2

      Hi,
      Did you Reboot your system after changing the Grub file?

      If that still does not work, try the following:

      type in a terminal: (all as one command-line)

      sudo sed "s/\(GRUB_CMDLINE_LINUX=\)\"\"/\1\"acpi_osi=Linux acpi_backlight=vendor\"/" /etc/default/grub -i


      Then update Grub with:

      sudo update-grub


      Finally Reboot:

      sudo reboot




      good luck.

      Delete
    2. AnonymousAugust 5, 2012 at 6:43:00 PM GMT+2

      thanks for the reply, yes i reboot my system and now i type


      sudo sed "s/\(GRUB_CMDLINE_LINUX=\)\"\"/\1\"acpi_osi=Linux acpi_backlight=vendor\"/" /etc/default/grub -i

      as i type this and give enter. no action take place.

      Delete
    3. marioAugust 6, 2012 at 10:30:00 PM GMT+2

      It should add a line to your grub file, and the next boot you should see a result. The Hp G62 is maybe a little different from my HP Dv7. If I come across a better solution, I'll keep you posted here.

      Delete

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