[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 #49 from Graham Perrin <grahamperrin at gmail.com> ---
Created attachment 221375
  --> https://bugs.freebsd.org/bugzilla/attachment.cgi?id=221375&action=edit
FreeBSD 13.0-CURRENT #75 main-c572-g82397d791 failed to suspend

Might this bug benefit from a broader title? 

In this photograph: 

* the failure to suspend did not involve disconnection

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See also: bug 202275

> USB SX lock hang involving sound devices

– and bug 220949

> When the only USB soundcard is disconnected, defunct 
> /dev/dsp0 is left, kernel warnings, programs hang
> 
> …
> 
> … The solution is not just straight forward, due to mmap() use. See also.
> 
> https://reviews.freebsd.org/D11140

>> ⚙ D11140 OSS: allow unplug soundcars without apps close devices

I don't doubt the complexity but essentially – wishing for improvements to the
FreeBSD sleep/wake story: 

* I'd like a simple press on a button to not require forethought to audio,
sound, pause, playback or USB

– the power button, preset to suspend. Thanks.

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