device: 0.789
network: 0.597
boot: 0.462
semantic: 0.459
socket: 0.419
graphic: 0.396
instruction: 0.375
other: 0.345
mistranslation: 0.259
vnc: 0.248
assembly: 0.197
KVM: 0.075

qemu 1.3.0: usb devices shouldn't have same vendor/product ID and same serial