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Ubuntu 20.04 Brightness Control Setting Unavailable

Ask Ubuntu Asked by HeeChan Kang on November 1, 2021

I installed Ubuntu 20.04 in my Asus ROG Zephyrus GA502IU. It has AMD Ryzen 7 4800HS CPU and NVIDIA GeForce GTX 1660 Ti Max-Q GPU. I am unable to control brightness in Settings as it is not there (missing). I am unable to control it via Fn + (F7 | F8) (most of my Fn+F# keys aren’t working, but I think it is unrelated to this post). I am currently using proprietary driver nvidia-driver-440.

I currently have modified /etc/default/grub to include nouveau.modeset=0 as Ubuntu won’t boot without it.

Things I’ve tried:

  • Modify /etc/default/grub‘s GRUB_CMDLINE_LINUX_DEFAULT to include acpi_backlight=vendor, acpi_backlight=default, acpi_osi=!, acpi_osi= to no avail.
  • Blacklist asus-nb-wmi inside /etc/modprobe.d/blacklist.conf
  • Tried using xrandr where there are no screen brightness changes:
$ xrandr -q | grep connected
xrandr: Failed to get size of gamma for output default
default connected primary 1920x1080+0+0 0mm x 0mm

$ xrandr --output default --brightness 0.8
xrandr: Gamma size is 0.

Thank you for reading and thank you in advance for your help!

One Answer

I have same CPU and GPU as you on a Asus computer and the issue of brightness was solved with 5.8 Kernel. Onmy this kernel supports renoir architecture.

So update your kernel to 5.8

Answered by Oli on November 1, 2021

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