[GPU BUG] failed to start Load/Save #tness of backlight:amdgpu_bl0

Hi, I installed Manjaro 20 on my 4800H laptop, things work fine but every time I boot up or shut down my laptop I got this error.

failed to start Load/Save Screen Backlight Brightness of backlight:acpi_video0
failed to start Load/Save #tness of backlight:amdgpu_bl0

So, I disabled the systemd-backlight@.service and the first error message has gone, but the second error message about AMD GPU still exists. How can I turn it off?

It’s just informative, you can add to kernel options acpi_backlight=native


It works, thanks!

I think this is the answer for people who use vega graphics. Considering it’s most likely a GPU driver bug, the only thing we can do is waiting for AMD to fix it. So I will share the step by step solution as Visone said, very simple:
edit /etc/default/grub
add acpi_backlight=native to GRUB_CMDLINE_LINUX_DEFAULT.
then run sudo update-grub.

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