How to fix function keys (FN) issue after upgrading to ubuntu 10.04(Lucid)

Problem

If you just updated to 10.04 and you might be experiencing issues with your function keys supposed to control screen brightness on my Asus UL30a It worked fine in 9.10.
Workaround

Open up Terminal and enter the following

gksudo gedit /etc/default/grub

Look for the line that says GRUB_CMDLINE_LINUX and add this

GRUB_CMDLINE_LINUX="acpi_backlight=vendor"

Save it and then update Grub

sudo update-grub

Reboot your system.

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14 thoughts on “How to fix function keys (FN) issue after upgrading to ubuntu 10.04(Lucid)

  1. is not working with HP Probook 4310s (ATI 4330)

    brightness sets manually here: /proc/acpi/video/DGFX/LCD/brightness

    but using ”acpi_backlight=vendor” now it says:
    cat /proc/acpi/video/DGFX/LCD/brightness

    Fn keys is not working too.

    [Reply]

  2. How could I get this to work for the volume keys on my laptop, it has two of the f keys mapped to volume when you hold down the fn key but when I use them the volume goes nuts all over the place?

    [Reply]

  3. I also haven’t gotten this to work with my fn+F4 (toggle screen) key on my HPdv3 yet.

    [Reply]

  4. The volume keys on my IBM ThinkPad G41 still don’t work along with any of the function keys :(

    [Reply]

  5. In my Acer Aspire 4736, following change worked. In /etc/default/grub,

    GRUB_CMDLINE_LINUX_DEFAULT=”quiet splash acpi_osi=Linux”

    [Reply]

  6. Hey Deepak, thank you for the tip, I also have an Acer Aspire 4736 and now I can finally change the brightness of the screen.

    The only problem now is that is working in the oposite direction, the brighter button makes the screen darker and vice-versa.

    [Reply]

  7. I did this to my Acer 5742z-4685 Ubuntu 10.04

    GRUB_CMDLINE_LINUX_DEFAULT=”quiet splash acpi_osi=”

    this fixed the brightness but, the icon don’t show wile changing, strange, the icon worked when the fn+brightness didn’t, the volume works fine..

    hope this helps everyone..good luck….

    [Reply]

  8. I had a problem I tried both ways but when I was going to update the second way it gave me this massage
    /etc/default/grub: 9: splash”: not found
    and I have found that the brightness change bar is not appearing

    [Reply]

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