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Thread: Brightness adjustment doesn't work

  1. #1
    Join Date
    Dec 2021
    Beans
    4

    Brightness adjustment doesn't work

    Hello Ubuntu masters,
    Greetings!

    I'm having trouble with my ubuntu 20.04 running on dell xps 13 9310. The brightness adjustment seem to be not working. I already modified the grub file with the following line but still not working.
    I'd like to check with you guys if you already encountered this case. If so, can you share some info on how to get rid with this? Thanks in advance!

    Code:
    GRUB_CMDLINE_LINUX_DEFAULT="quiet splash acpi_osi=Linux acpi_backlight=vendor"
    GRUB_CMDLINE_LINUX=""
    Last edited by deadflowr; December 3rd, 2021 at 07:43 PM. Reason: reset font; added code tags

  2. #2
    Join Date
    Jun 2020
    Beans
    330

    Re: Brightness adjustment doesn't work

    stupid question...does the brightness control key on the keyboard also not work?

    i'm thinking way back some time i had a laptop that for some reason the brightness control was set to off in BIOS...
    have a look at BIOS settings for something to do with brightness
    Last edited by 3nd; December 3rd, 2021 at 07:44 PM.
    xubuntu 20.04.3 LTS (focal fossa)

  3. #3
    Join Date
    Apr 2011
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    Mystletainn Kick!
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    12,444
    Distro
    Ubuntu

    Re: Brightness adjustment doesn't work

    It's unclear if you reloaded/updated grub?
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  4. #4
    Join Date
    Jun 2010
    Location
    London, England
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    Hidden!
    Distro
    Ubuntu Development Release

    Re: Brightness adjustment doesn't work

    In my ignorance I do not understand how adding a command to change the configuration of Grub would solve this problem. Surely the place to look is with the Linux configuration. After all, Linux is the operating system. But here is the issue. There are several command line utilities that can be installed to configure screen brightness but they only work on the X-Server and not on a Wayland compositor.

    In Ubuntu 20.04 the place to make adjustments is System Settings>Power. On my desktop machine I do not get a slider to make screen brightness adjustments. Things might be different for a laptop. It could also be that I need to make an adjustment in the machine's BIOS (it is an old machine and recently was put back to a default configuration and that could be the reason for no option to change screen brightness). So, I support the above given advice to look in the UEFI settings.

    Regards
    It is a machine. It is more stupid than we are. It will not stop us from doing stupid things.
    Ubuntu user #33,200. Linux user #530,530


  5. #5
    Join Date
    Dec 2021
    Beans
    4

    Re: Brightness adjustment doesn't work

    @3Nd -- Stupid question??? Well, I thank you for that

    The control on the keyboard doesn't work. Of course, I checked on the BIOS. Thanks for your response. LOL

  6. #6
    Join Date
    Dec 2021
    Beans
    4

    Re: Brightness adjustment doesn't work

    deadflowr -- I just tried this one -> https://ubuntuforums.org/showthread....0#post12126780

  7. #7
    Join Date
    Dec 2021
    Beans
    4

    Re: Brightness adjustment doesn't work

    grahammechanical -- Thanks for the response. I really appreciate it. I'm new to linux and trying to learn to solve things with my own machine. I just switched from Windows to Linux and trying to learn new things here.
    Thanks again.

  8. #8
    Join Date
    Mar 2007
    Location
    Promiseland
    Beans
    1,218
    Distro
    Xubuntu 20.04 Focal Fossa

    Re: Brightness adjustment doesn't work

    Display too bright?
    Code:
    $ xgamma -gamma 0.8
    Display too dim?
    Code:
    $ xgamma -gamma 1.2
    Reset to original value.
    Code:
    $ xgamma -gamma 1.0
    Cheers,


    The Linux Command Line at http://linuxcommand.org/

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