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)
Status in OEM Priority Project:
New
Status in xserver-xorg-video-amdgpu package in Ubuntu:
New
Bug description:
On Dell Precision 7740, after installed amdgpu-pro 19.10-793418, the
HDMI audio will lose function after the dGPU did runtime suspend.
How to check the AMD dGPU is in runtime suspend:
$ lspci -s 01:00.0 -xxvv
When the AMD dGPU is in runtime suspend, all of the registers will be 0xf.
Release: 18.04 LTS
kernel: 4.15.0-1037-oem
amdgpu-pro: 19.10-793418
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