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From: Hans Petter Selasky <hselasky@c2i.net>
To: Alexey Dokuchaev <danfe@nsu.ru>
Date: Mon, 5 Mar 2012 07:10:22 +0100
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Cc: freebsd-stable@freebsd.org, freebsd-usb@freebsd.org,
	Jung-uk Kim <jkim@freebsd.org>
Subject: Re: Resume broken in 8.3-PRERELEASE
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On Monday 05 March 2012 05:17:59 Alexey Dokuchaev wrote:
> On Sat, Mar 03, 2012 at 09:11:29AM +0100, Hans Petter Selasky wrote:
> > On Friday 02 March 2012 20:25:32 Jung-uk Kim wrote:
> > > Try the attached patch.  At least, it fixed my problem.
> > 
> > I've committed your patch with some minor modifications.
> > 
> > http://svn.freebsd.org/changeset/base/232448
> 
> Unfortunately, it does not fix resume for me; and hw.usb.no_shutdown_wait
> flipping did not make any difference either.  Any other ideas?
> Particularly, I'm curious why disabling all USB modules still does not
> allow this laptop to resume.  What are USB debugging techniques?

USB debugging:

Have "options USB_DEBUG" in kernel config. Then set xxx.debug = 15 under 
hw.usb, typically hw.usb.uhub.debug=15

--HPS