[Bug 107835] DisplayPort audio stopped working in a kernel upgrade

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=107835

--- Comment #1 from Marti Raudsepp <marti at juffo.org> ---
Graphics card: ASUS Radeon R9 270
Kernel: 5.2.9-arch1-1-ARCH

I recently had some issues with the "radeon" driver and discovered that the
"amdgpu" driver now has support for Southern Islands (SI) GPUs using the
amdgpu.si_support=1 boot flag.

Graphics stuff works great with "amdgpu" so far, however, all HDMI audio
outputs are marked as "(unplugged) (unavailable)". This seems to be a similar
problem, based on IRC logs by BCMM at
https://dri.freedesktop.org/~cbrill/dri-log/?channel=radeon&highlight_names=&date=2018-09-05
which lead me to this bug report.
His screenshot from pavuctl: https://i.imgur.com/67HYPG3.png

Ben, are you still having this issue too?

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