From owner-freebsd-current@FreeBSD.ORG  Fri Dec 12 20:36:33 2008
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From: Hans Petter Selasky <hselasky@c2i.net>
To: freebsd-usb@freebsd.org
Date: Fri, 12 Dec 2008 21:38:44 +0100
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Cc: freebsd-current@freebsd.org, Oliver Fromme <olli@lurza.secnetix.de>
Subject: Re: usb2 + scanner HP ScanJet 4300C
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On Friday 12 December 2008, Oliver Fromme wrote:
> usb2_alloc_device:

You could try to edit the code in "sys/dev/usb2/core/usb2_device.c" and loop 
two times on the set_config command in "usb2_alloc_device()".

Or you can try to make the code ignore the return value from the failing 
set_config command. Also try to turn on more debugging:

sysctl hw.usb2.debug=15

--HPS