From owner-freebsd-usb@FreeBSD.ORG  Tue Apr  3 12:27:04 2007
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From: Hans Petter Selasky <hselasky@c2i.net>
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Date: Tue, 3 Apr 2007 14:26:38 +0200
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Subject: Re: libusb usb_interrupt_read hangs under FreeBSD
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On Tuesday 03 April 2007 13:27, Xiaofan Chen wrote:
> I was redirected to this list as per the suggestion from the
> libusb mailing list.
>
> It will be greatly appreciated that someone can suggest
> how to debug this problem?

With the new USB stack installed, do like this:

sysctl hw.usb.debug=15

Then run you program.

Then get all the lines with "ugen()" in the debug output.

sysctl hw.usb.debug=0

--HPS