[Bug 265121] system will get stuck when dragonfly DAC plugged in and being used

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=265121

--- Comment #1 from Jonathan Vasquez <jon@xyinn.org> ---
Some minor updates. I was able to figure out some repro steps:

1. Plug DragonFly into the machine.
2. Open up `mixertui`
3. Switch to the /dev/pcm3 device (I only have one audio device plugged in so
it gets assigned pcm3. Adjust accordingly if you have other USB audio devices
connected like a headset).
4. Suspend the computer (zzz, or some acpiconf -s 3).

The machine should now wait for the mixer to quit forever.

If I closed the mixer and suspend the machine, it would sleep and resume
successfully.

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