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From: Hans Petter Selasky <hselasky@c2i.net>
To: Guido van Rooij <guido@gvr.org>
Date: Fri, 5 Oct 2012 13:26:42 +0200
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Cc: freebsd-usb@freebsd.org
Subject: Re: usb3 umass device on usb2 port not recognised
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On Friday 05 October 2012 10:57:27 Guido van Rooij wrote:
> That piece of code did not help either:
> usb_alloc_device: set address 2 failed (USB_ERR_STALLED, ignored)
> usbd_setup_device_desc: getting device descriptor at addr 2 failed,
> USB_ERR_STALLED usbd_req_re_enumerate: addr=2, set address failed!
> (USB_ERR_STALLED, ignored) usbd_setup_device_desc: getting device
> descriptor at addr 2 failed, USB_ERR_STALLED usbd_req_re_enumerate:
> addr=2, set address failed! (USB_ERR_STALLED, ignored)
> usbd_setup_device_desc: getting device descriptor at addr 2 failed,
> USB_ERR_STALLED ugen5.2: <Unknown> at usbus5 (disconnected)
> uhub_reattach_port: could not allocate new device
> 
> Do you know if there is a way to dump the USB-traffic between the disk
> and a Linux system? Like I said earlier, the disk works on Ubuntu
> 12.04, so it might give a clue on the difference between our way of
> resetting the device and their way... (tcpdump only show traffic after he
> rset and address assignment)
> 

Yes, search for USBmon. Usually there are some device entries which you cat 
directly to a file.

Might be timing related!

--HPS