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Thread: FN Keys for brightness not working

  1. #1

    Default FN Keys for brightness not working

    Hello, today I did a fresh install of Leap 42.3 on an old hp laptop, Pavilion dv9700. Some FN keys work, like Play/Pause of Print. Also, special buttons outside the normal keyboard works as well. But FN keys for brightness does not. I can control brightness, and I have map the actions to other shortcuts temporarily.

    The hp_wmi module is active. My card is an nvidia and I installed its driver from YaST after adding the repo (before the driver the keys weren't working either).

    Am I missing something? Is there something else to try?

    Thanks!

  2. #2
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    Default Re: FN Keys for brightness not working

    Hi, I don't know how the BIOS in your HP model might behave, but in a laptop of mine I need to insert "acpi_osi= " including the trailing space in the Grub boot line for the brightness keys to work.
    Other choices might include "acpi_osi=Linux" or other hints as found at https://www.kernel.org/doc/Documenta...parameters.txt
    The Nvidia GPU might also require special handling, if the above doesn't work. The README file included in the Nvidia driver or the Nvidia Forums might help if that is the case.
    Leap 15.1 Gnome on i7 4720HQ + Geforce GTX960M
    testing Leap 15.2Beta

  3. #3

    Default Re: FN Keys for brightness not working

    Quote Originally Posted by OrsoBruno View Post
    Hi, I don't know how the BIOS in your HP model might behave, but in a laptop of mine I need to insert "acpi_osi= " including the trailing space in the Grub boot line for the brightness keys to work.
    Other choices might include "acpi_osi=Linux" or other hints as found at https://www.kernel.org/doc/Documenta...parameters.txt
    The Nvidia GPU might also require special handling, if the above doesn't work. The README file included in the Nvidia driver or the Nvidia Forums might help if that is the case.
    I found this

    https://www.kernel.org/doc/Documenta...parameters.txt

    but couldn't see anything related. I'm gonna try now with your link but I tried leaving blank and "Linux" before with no effect.

    Thanks!

  4. #4
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    Default Re: FN Keys for brightness not working

    Other kernel boot options worth trying...

    Code:
    acpi_backlight=vendor
    Code:
    acpi_backlight=native

  5. #5

    Default Re: FN Keys for brightness not working

    I've been trying different options but none of them works. Actually, I can map brightness up and down to other key combinations. But FN+F7/F8 doesn't seem to be recognized by the system.

    Maybe the problem is somewhere else?

    Thanks!

  6. #6
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    Default Re: FN Keys for brightness not working

    Quote Originally Posted by eXtremeDevil View Post
    I've been trying different options but none of them works. Actually, I can map brightness up and down to other key combinations. But FN+F7/F8 doesn't seem to be recognized by the system.

    Maybe the problem is somewhere else?

    Thanks!
    I assume you're referring to desktop-related key mappings for brightness adjustment? They rely on xrandr (in user space), rather than the ACPI kernel module for video.
    Last edited by deano_ferrari; 30-Jul-2017 at 03:05.

  7. #7

    Default Re: FN Keys for brightness not working

    I have tried xev and those keys are not recognized

    Is it just that the PC is too old?

    Thanks

  8. #8
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    Default Re: FN Keys for brightness not working

    Quote Originally Posted by eXtremeDevil View Post
    I have tried xev and those keys are not recognized

    Is it just that the PC is too old?

    Thanks
    No, I don't think the age of the machine is a problem here. Some of the HP Pavillion models seem to have BIOS quirks that can cause issues like this. A quick search turns up a large number of similar threads and bug reports.

    Did you try the kernel parameters I suggested a couple of posts back?

  9. #9

    Default Re: FN Keys for brightness not working

    Quote Originally Posted by deano_ferrari View Post
    No, I don't think the age of the machine is a problem here. Some of the HP Pavillion models seem to have BIOS quirks that can cause issues like this. A quick search turns up a large number of similar threads and bug reports.

    Did you try the kernel parameters I suggested a couple of posts back?
    Yes, both makes brightness break (no slider in energy settings).

    So keys not working are related to those kernel options?

  10. #10
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    Default Re: FN Keys for brightness not working

    Quote Originally Posted by eXtremeDevil View Post
    Yes, both makes brightness break (no slider in energy settings).

    So keys not working are related to those kernel options?
    Sometimes it's down to a quirk of the ACPI implementation. Bugs get reported, and kernel patches introduced to help workaround these issues.

    You might try try testing the behaviour with other live distros perhaps.

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