https://bugs.freedesktop.org/show_bug.cgi?id=106597
--- Comment #5 from Lukas Wunner <lu...@wunner.de> ---
Ok I found this dmesg ouput of a 4.17 kernel...
https://bugs.freedesktop.org/attachment.cgi?id=139668
However the HDA device 0000:01:00.1 is not enumerated! It *is* enumerated in
the 4.16 dmesg output you've attached. What gives?
We know there are Nvidia GPUs which hide the HDA controller if no external
display is attached:
https://bugs.freedesktop.org/show_bug.cgi?id=75985
Maybe something like that is going on here despite this being an AMD GPU?
Also, there are Dell machines which can be switched to one of two modes in the
BIOS: In one mode, audio is streamed to external displays via the Intel HDA, in
the other mode, it's streamed via the AMD HDA. In the former mode, the AMD HDA
serves no purpose and should thus be hidden as per this patch:
https://lkml.org/lkml/2018/4/20/244
It's possible that something similar is needed here.
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