device: 0.789
network: 0.597
boot: 0.462
semantic: 0.459
socket: 0.419
graphic: 0.396
other: 0.345
files: 0.317
performance: 0.298
debug: 0.288
vnc: 0.248
PID: 0.184
permissions: 0.132
KVM: 0.075

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