Upstream git head still gives me this problem, as does back to 0.14.0.

Note however that the same qemu builds, with the same usb stick, work
fine using a linux guest.

The same stick, inserted to the same windows version on native hardware
also works.

So it's not bad hardware, it's not hardware unsupported by windows, and
qemu *is* passing the usb device through sufficiently that windows
SHOULD be able to make use of it.

So this appears to be something specific that windows wants.

I've seen mention of windows registry tricks involving removal of top
and bottom filters for the device...  I haven't tested that to see if
that would be a workaround.

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https://bugs.launchpad.net/bugs/685096

Title:
  USB Passthrough not working for Windows 7 guest

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