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Zazaeil
Asked: 2020-06-07 08:22:33 +0800 CST

Brightness control does not work on Ubuntu 20.04 LTS with Nvidia GeForce GTX 1660 Ti

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Got proprietary Nvidia drivers installed by Ubuntu itself, graphic card is recognized well by the system yet brightness control does not work when adjusted by either FN + F5/6 shortcut or by dragging brightness slider manually (keyboard shortcut triggers slider move as well, so it's heard by the system).

However: xrandr | grep " connected" | cut -f1 -d " " produces single output DP-2 and xrandr --output DP-2 --brightness 0.7 does change the brightness.

Googled a lot, tried various options, neither works to me. What can I do to make it work when dragging the slider as well?

nvidia graphics brightness nvidia-geforce 20.04

2 Answers

  1. Best Answer

    So, finally - after trying lots and lots of options - following helped me: At the /usr/share/X11/xorg.conf.d folder find file related to your nvidia and append following section:

    Section "Device"
    Identifier "Device0"
    Driver "nvidia"
    VendorName "NVIDIA Corporation"
    BoardName "<your graphic card as it named in your system>"
    Option "RegistryDwords" "EnableBrightnessControl=1"
EndSection

    You can find the name of your graphic by searching for "system" in your Ubuntu. In my case it is GeForce GTX 1660 Ti so in abovementioned configuration file it gonna be BoardName "GeForce GTX 1660 Ti" - enclosed in doublequotes.

    Save and reboot.

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    1. Run nvidia-settings

    2. Select X Server Display Configuration

    3. Click Save to X Configuration File (don't click Save on opened dialog)

    4. Click Show preview...

    5. Copy Section "Device" ... EndSection (maybe you will need to copy Monitor and Screen sections)

    6. Create file /usr/share/X11/xorg.conf.d/10-nvidia-settings.conf and paste copied text in it, add to Device section Option "RegistryDwords" "EnableBrightnessControl=1", save file

    7. Add to file /etc/initramfs-tools/modules

      nvidia
nvidia-drm
nvidia-modeset

    8. Run sudo update-initramfs -u

    9. Restart

    If you played with file /etc/default/grub than try to remove all acpi... settings from GRUB_CMDLINE_LINUX_DEFAULT=

    Description about steps 7 and 8 is here

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