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got the problem with not working brightness control (Ubuntu 21.04). Tried updating grub but no result from this post.

Graphics card AMD radeon Vega 11.

Thanks beforehand

Dmytro Petrenko
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1 Answers1

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I've had that problem on my old Thinkpad. It is an acpi problem, which I could solve by activating the brightness control of my device (named thinkpad-acpi)

Since my hardware is different from yours just take it as a rough guide:

Created file /etc/modconf.d/brightness.conf

options thinkpad-acpi brightness_mode=1

So you should check your sys files for more information, about whether you have a vendor acpi which you could use. There is an excellent article that might shed some light.

kanehekili
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