Comment # 5
on bug 106597
from Lukas Wunner
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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