How to debug a misbehaving usb device (DYMO LabelManager PC)?

[Torfinn Ingolfsen]

Hello,

So, I have this misbehaving usb device, a label printer which I use to label things in my house
(which poweradapter belongs to which device, and so on).
It is a DYMO LabelManager PC[1], which is an old device. Not to be confused with the LabelManager PC II.
Based on information found on the web, this device isn't following the usb specification 100%.
And no driver exists for FreeBSD. I do not plan on changing that.
What I try to do, is to "pass" the usb device from a FreeBSD host, to a virtual machine running windows
(in VirtualBox).
So far, I have managed to get the win vm to regocnize the label printer, adn install drivers for it.
But - it will not print, claiming there is some error with the usb port. And that might be true.

On the host side, I am using the latest FreeBSD 8.2-stable:
root at kg-v7# uname -a
FreeBSD kg-v7.kg4.no 8.2-STABLE FreeBSD 8.2-STABLE #6: Sat Jul  2 18:39:45 CEST 2011     root at kg-v7.kg4.no:/usr/obj/usr/src/sys/GENERIC  amd64
And in /var/log/messages, I see this when the device is attached:
Jul  3 18:09:59 kg-v7 kernel: usb_alloc_device: Failure selecting configuration index 0:USB_ERR_STALLED, port 4, addr 3 (ignored)
Jul  3 18:09:59 kg-v7 kernel: ugen0.3: <vendor 0x0922> at usbus0

And usbconfig info:
root at kg-v7# usbconfig -u 0 -a 3
ugen0.3: <product 0x0011 vendor 0x0922> at usbus0, cfg=255 md=HOST spd=LOW (1.5Mbps) pwr=ON
root at kg-v7# usbconfig -u 0 -a 3 dump_device_desc
ugen0.3: <product 0x0011 vendor 0x0922> at usbus0, cfg=255 md=HOST spd=LOW (1.5Mbps) pwr=ON

  bLength = 0x0003 
  bDescriptorType = 0x0001 
  bcdUSB = 0x0209 
  bDeviceClass = 0x0021 
  bDeviceSubClass = 0x0000 
  bDeviceProtocol = 0x0001 
  bMaxPacketSize0 = 0x0001 
  idVendor = 0xc000 
  idProduct = 0x0901 
  bcdDevice = 0x0004 
  iManufacturer = 0x0000  <no string>
  iProduct = 0x0002  <retrieving string failed>
  iSerialNumber = 0x0003  <retrieving string failed>
  bNumConfigurations = 0x0001 

What is the best way to debuug this device?
I am hoping to get it to a state where it can be forwarded to the virtual machine,
and work there.

More details  on the FreeBSD page for my label printer[2]

References:
1) http://global.dymo.com/ieIE/Products/LabelManager_PC.html
2) http://sites.google.com/site/tingox/lm_pc_freebsd
-- 
Regards,
Torfinn Ingolfsen