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


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.

Open up Terminal and enter the following

gksudo gedit /etc/default/grub

Look for the line that says GRUB_CMDLINE_LINUX and add this


Save it and then update Grub

sudo update-grub

Reboot your system.

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14 Responses

  1. Commando says:

    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.

  2. Carlo says:

    It works great now. Thanks for your tip!

  3. Wolfman says:

    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?

  4. Jackelope King says:

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

  5. sheen says:

    won’t work on eMachines D725 Lucid Lynx

  6. Jason says:

    The volume keys on my IBM ThinkPad G41 still don’t work along with any of the function keys 🙁

  7. Abhi says:

    Hi There,

    The fix does not work for HP DV3-2154ca laptop! Please help. would really appreciate that



  8. Deepak says:

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

    GRUB_CMDLINE_LINUX_DEFAULT=”quiet splash acpi_osi=Linux”

  9. Paolo says:

    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.

  10. Tommy says:

    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….

  11. Ryan says:

    Just wanted to say thank you… works perfectly on my HP dv3t-2000.

  12. lennart says:

    Thank you very much, been looking for this for some time. Works like a charm on my asus b50a!

  13. Dark ubuntu says:

    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

  14. sandeep says:

    thanks dude!! now it is working

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