Score:2

Laptop Ubuntu 21.04 brightness can't be adjusted

cn flag

I received my new laptop with Ubuntu 21.04 on it, Nvidia 3070 GPU and Ryzen 9 5000 series CPU (with internal GPU). Running kernel 5.11.0-25-generic. Gnome tries to render most things using the Ryzen GPU.

For some reason i am unable to change the brightness of the laptop screen. I do see the following backlight device /sys/class/backlight/amdgpu_bl0/ which changes to /sys/class/backlight/nvidia_0/ when i use the bios to use the discrete GPU. Using the discrete GPU does make the brightness up/down work. which leads me to believe im missing drivers? The file brightness in the sys dir does change values when adjusting the brightness.

I tried:

  • Grub setting changes
  • adding "brightness_control" option to xorg settings for AMDGPU

How do i go about trying to fix this? i want to use hybrid mode so i dont use up my battery in no-time.

edit:

It's a Skikk Laptop, 15MD7Y. So not a well known brand or anything.

  • AMD® Ryzen 9 5900hx with radeon graphics × 16 NVIDIA Corporation
  • GA104M [GeForce RTX 3070 Mobile / Max-Q]
in flag
Could you update your question to include the brand and model of notebook? Some machines need a different combination of steps to have the backlight adjustment done.
Thul avatar
cn flag
@matigo I added it to the question.
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