From owner-freebsd-multimedia@FreeBSD.ORG  Thu Aug 16 12:54:01 2012
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Date: Thu, 16 Aug 2012 12:54:00 GMT
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To: gavin@FreeBSD.org, freebsd-multimedia@FreeBSD.org, freebsd-usb@FreeBSD.org
From: gavin@FreeBSD.org
Cc: 
Subject: Re: usb/156726: [snd_uaudio]: snd_uaudio(4) fails to detach when
	mixer is open
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Synopsis: [snd_uaudio]: snd_uaudio(4) fails to detach when mixer is open

Responsible-Changed-From-To: freebsd-multimedia->freebsd-usb
Responsible-Changed-By: gavin
Responsible-Changed-When: Thu Aug 16 12:53:15 UTC 2012
Responsible-Changed-Why: 
This sounds potentially like a USB stack issue to me.

http://www.freebsd.org/cgi/query-pr.cgi?pr=156726