There is a workaround solution to avoid this bug.
It is to disable the amdgpu runtime suspend.
Just add amdgpu.runpm=0 on the kernel command line.
** Also affects: oem-priority
Importance: Undecided
Status: New
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https://bugs.launchpad.net/bugs/1847219
Title:
HDMI audio lost function after the dGPU did runtime suspend. (AMD RX
580)
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