From owner-freebsd-multimedia@FreeBSD.ORG  Sat Nov 10 13:56:10 2012
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Date: Sat, 10 Nov 2012 14:55:53 +0100
From: Clemens Ladisch <clemens@ladisch.de>
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To: freebsd-multimedia@freebsd.org
Subject: Re: USB audio 2.0 testers wanted
References: <201211080816.56068.hselasky@c2i.net>
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Marcel Bonnet wrote:
> The bcdUSB field reports the highest version of USB the device
> supports.

But the USB specification is *not* the USB Audio specification.

USB Audio 2.0 devices can be recognized by a bFunctionProtocol
entry of 32 in lsusb, like this:

  ...
  bDeviceProtocol         1 Interface Association
  ...
      bFunctionClass          1 Audio
      bFunctionSubClass       0
      bFunctionProtocol      32


Regards,
Clemens