This is the thread about this bug from the alsa maillist:
https://mailman.alsa-project.org/pipermail/alsa-
devel/2019-November/158336.html
And this issue will be fixed if radeon, nouveau and amdgpu drivers
support audio component. Now the amdgpu driver already supported audio
component from kernel-5.4, so if your machine is driven by amdgpu driver
(graphic card driver), you could test 5.4 kernel or ubuntu focal kernel
(the kernel for 20.04). Please check amdgpu driver is in-tree driver
instead of amdgpu-pro driver (proprietary driver).
For unload/reload the HD-audio driver mentioned that thread, I thought it
should be (but it failed when I ran alsa unload/force-unload)
localhost:~$ alsa --help
Usage: /sbin/alsa {unload|reload|force-unload|force-reload|suspend|resume}
If someone has any idea or any log, please reply to the thread alsa-
devel/2019-November/158336.html
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https://bugs.launchpad.net/bugs/1834771
Title:
No HDMI-audio after kernel 4.15.-0.50
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