On Wed, 28 Oct 2020 13:19:59 +1100
Eyal Lebedinsky <fed...@eyal.emu.id.au> wrote:

> This is up-to-date f32 amd64.
> 
>  From time to time I find that I do not have sound, and then
> pavucontrol shows no configuration is available. Sound is via HDMI to
> the monitor (TV). The internal sound device is not used.
> 
> So far the only way out I found is to log out/in, but this is not
> ideal. Is there a way to make the system (I suspect it is X) see the
> sound device and enable it? Maybe with a udev command?
[snip]
> /sys/devices/virtual/sound/seq
> /sys/devices/virtual/sound/timer
> 
> When I have no sound I am missing the last two devices.
> 
> In case it is related, there is also a KVM instance running on this
> machine.
> 

Does it fix it if you run 
pulseaudio --start
That should re-initialize pulseaudio, picking up available devices.  If
the problem is some kind of race condition between X and pulseaudio as
it seems to be because it is intermittent, this should remedy it.

I don't think this is directly caused by X, as X should not be creating
virtual sound devices.  But, I'm no expert.
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