On 06/27/2016 05:20 PM, Mark LaPierre wrote: > The reply to the bug post went on to say that the problem is that the > USB 2.0 camera will not work with the USB 1.1 default hub and that I > should change the hub from USB 1.1 to USB 2.0. > > I see no way to do that. I don't either, but maybe this is helpful... According to this document, you can specify the bus that a USB device is attached to, including pass-through devices: http://git.qemu.org/?p=qemu.git;a=blob_plain;f=docs/usb2.txt;hb=HEAD So, one option would be to create a shell script that modifies the arguments given to qemu-system-x86_64, and then use "virsh edit <guest>" to replace the default emulator with the path to your shell script. I do that for a guest where I pass through a video card, which needs a PCI express bridge: $ cat /usr/local/bin/qemu-system-x86_64-passthrough #!/bin/bash declare -a qemuargs for x in "$@" do if test "${x:0:21}" == "vfio-pci,host=01:00.0" then qemuargs+=(ioh3420,bus=pci.0,addr=1c.0,multifunction=on,port=1,chassis=1,id=root.1) qemuargs+=(-device) qemuargs+=(vfio-pci,host=01:00.0,id=hostvga,bus=root.1,addr=00.0,multifunction=on) else qemuargs+=("$x") fi done /usr/bin/qemu-system-x86_64 "${qemuargs[@]}"