From owner-freebsd-usb@FreeBSD.ORG  Wed Jun  6 16:53:39 2012
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From: Hans Petter Selasky <hselasky@c2i.net>
To: Mark Felder <feld@feld.me>
Date: Wed, 6 Jun 2012 18:47:52 +0200
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Cc: freebsd-usb@freebsd.org
Subject: Re: usb power output issues
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On Wednesday 06 June 2012 18:37:15 Mark Felder wrote:
> On Wed, 06 Jun 2012 11:21:04 -0500, Hans Petter Selasky <hselasky@c2i.net>
> 
> wrote:
> > Attachments look OK.
> > Are any other USB devices being used at the time this failure happens?
> 
> No, the only things plugged in via USB are the keyboard, the mouse, and a
> cable for the USB keyboard's built-in hub. No other devices are present.

Then I see no reason for a software fault. You could dump all threads when 
this happen and see if some threads are stuck in xxx_drain() functions. It is 
very unlikely though.

--HPS