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

From: <bugzilla-noreply_at_freebsd.org>
Date: Sat, 29 Oct 2022 11:58:58 UTC 
https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=194727

--- Comment #81 from Ivan <bsd@abinet.ru> ---
I've got a working suspend/resume and found an issue with virtual_oss.
When started, virtual_oss locks pcm device. 

pcm1: unregister: channel pcm1:virtual:dsp1.vp0 busy (pid 14775)
pcm1: Waiting for sound application to exit!

Is suspend sequence differs from USB device detach? virtual_oss works normally
if I detach device, but hangs suspend process.

I issue zzz for suspend.

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