I don't think amdgpu's actual_brightness works in the first place.
Did you try any of the following kerenl parameters?
acpi_backlight= [HW,ACPI]
acpi_backlight=vendor
acpi_backlight=video
If set to vendor, prefer vendor specific driver
(e.g. thinkpad_acpi, sony_acpi, etc.) instead
of the ACPI video.ko driver.
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https://bugs.launchpad.net/bugs/1899626
Title:
Backlight does not work on the legion 5 15arh
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