** Changed in: qemu Status: Incomplete => Triaged -- You received this bug notification because you are a member of qemu- devel-ml, which is subscribed to QEMU. https://bugs.launchpad.net/bugs/1511887
Title: USB device 1.1 not correctly passedthru from Linux host to Windows guest Status in QEMU: Triaged Bug description: I have USB Digital Oscilloscope which works great on pure Windows machine but not work on virtualized one. I tried passthru the device from my Debian Jessie (64bit) host machine to Windows 7 (32bit) guest machine but unfortunately it does not work very well. It looks that device is passed thru so Windows machine knows about new device and loads HID device driver for it but the device driver failed to start the device and details of an error provided by device manager is "This device cannot start" Code 10. Installed Qemu version: 2.1+dfsg-12+deb8u4 0 USB device spec: Dynon Instruments ELAB-080, USB 1.1 On linux host computer --------------------------- lsusb identify it as: Bus 003 Device 009: ID 13a3:0001 lsusb -t identify it as: /: Bus 03.Port 1: Dev 1, Class=root_hub, Driver=uhci_hcd/2p, 12M |__ Port 1: Dev 9, If 0, Class=Human Interface Device, Driver=usbhid, 12M This is how I started my Windows guest machine ------------------------------------------------------ kvm -cpu host \ -m 2048MiB \ -hda test.vdi \ -ctrl-grab \ -parallel /dev/parport0 \ -usbdevice host:13a3:0001 ...also instead of last line I tried this one: -device usb-host,vendorid=0x13a3,productid=0x0001 none of them help to properly handle my device inside guest machine. Only one time the Windows guest machine properly start the device so software for that oscilloscope can identify the Oscilloscope and measure for a while but unfortunately after I guess 5 seconds of measurement the device was disconnected from Windows and never start working again even after couple of restarts of guest machine even after plug and unplug it's USB cable and power cable. I searched for a solution or some clues to get it work but none of my searching over the internet was successful. Because device works on pure Windows but not work on virtualized one, I think there is a problem with handling not standard USB devices (like sticks, keyboards, mouses etc.) To manage notifications about this bug go to: https://bugs.launchpad.net/qemu/+bug/1511887/+subscriptions