In version 0.12.1, using -usbdevice with an inexistent device exits without any error message, thus confusing the user:
$ qemu-system-x86_64 -usbdevice null ; echo $? 1 $ In 0.11.X, the error is ignored, but at least a message is displayed: $ qemu-system-x86_64 -usbdevice null Warning: could not add USB device null -- Aurelien Jarno GPG: 1024D/F1BCDB73 aurel...@aurel32.net http://www.aurel32.net
