[Bug 194727] uaudio device gets disconnected, and hangs usb until everything using /dev/mixer* is closed

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=194727

--- Comment #29 from Greg V <greg at unrelenting.technology> ---
(In reply to Hans Petter Selasky from comment #27)

Nice. I've been able to detach a USB soundcard, click on the built-in Realtek
one in pavucontrol and playback seamlessly continued on the built-in soundcard.

Pulse did show these messages when detaching:

E: [oss] module-oss.c: Mixer shutdown.
E: [oss] module-oss.c: SNDCTL_DSP_GETOPTR: Bad file descriptor

and dmesg:

uaudio0: at uhub2, port 22, addr 2 (disconnected)
pcm8: unregister: channel pcm8:virtual:dsp8.vp0 busy (pid 27294)
pcm8: Waiting for sound application to exit!
pcm8: detached
uaudio0: detached

BTW, I'm preparing a merge request for upstream pulseaudio with our patches and
new meson patches, should I include this?

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