[fedora-virt] Why is name not shown in Add Hardware for USB device?

[Tom Horsley]

If I go to "Add Hardware" in virt-manager and select USB host device,
I get a dialog with a list of things similar to lsusb output, but
some of the entries are blank. For instance, lsusb shows:

Bus 003 Device 022: ID 046d:0825 Logitech, Inc. Webcam C270

but the usb device dialog only shows Bus 3 device 22 with no
description for logitech webcam.

Is this a hint that usb passthrough won't work for this?

Certainly if I select the bus 3 device 22 item, I can
attach it, but the Windows 7 virtual machine doesn't
see anything show up.

Anyone gotten a webcam like this to work with qemu?