Comment # 10 on bug 1180591 from
(In reply to Takashi Iwai from comment #9)
> Ah, that's what I wrongly remembered, sorry.
> But yes, testing with nouveau once would be interesting.  This also allows
> testing with other older kernels more easily, too.

Switching to nouveau made no difference.

The last kernel allowing me to change display backlight is 5.7. So I guess the
issue is introduced in kernel 5.8.

I'm attaching the dmesg and hwinfo next.

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