Using libvirt 1.2.18 (-1 Arch) and QEMU git-master (2.4.0.r40384.2d69736). Installed using Q35 chipset.
Using managedsave/start is unusable due to a non-stop repeating uhci_hcd error. (Fills tty0 screen every 0.003 kernel seconds with errors.) QEMU won't let me remove the USB controller -- remove is grayed out. virsh edit allows me to remove them, which lets me use managedsave/start. QEMU only lets me remove the USB redirection entries, which didn't help.
