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+
+KVM guest VM does not reattach a throughpassed USB printer from Host after switching printer off and on
+
+
+Host OS: Gentoo, all packages built 2014-10-01
+
+qemu version 2.1.0-r1
+
+Linux kernel 3.14.14   x86_64 Intel(R) Core(TM) i3-3220T CPU @ 2.80GHz GenuineIntel GNU/Linux
+
+
+Guest VM: Debian 7 (Wheezy) Linux 3.2.0 686
+
+
+Start command:
+/usr/bin/qemu-system-i386 -enable-kvm -name wheezy -k de -serial null -parallel null -hda /var/kvm/wheezy.kvm-img -daemonize -net nic,macaddr=02:00:00:00:01:31 -net tap,ifname=tap3,script=no,downscript=no -m 512 -pidfile /var/run/kvm/wheezy.pid -usb -usbdevice tablet -runas myuser -vnc 127.0.0.1:3 -usbdevice host:04e8:3242
+
+Problem:
+USB printer pass-through from KVM host to guest vm only works if I start the qemu kvm when the USB printer (vendor/product ID 04e8:3242) is switched on and therefore shown in lsusb on the host. Then it is available in the started VM.
+
+But when I switch the usb printer attached to the host off, it disappears in lsusb both on the host and the VM (as expected) but when I switch the USB printer on again, it is shown on the host and also on the QEMU Monitor (Crtl Alt Shift 2 -> info usbhost), but in the VM lsusb does not show it again- so USB pass-through / hot plugging does not work. It worked with a previous Version of qemu (1.0 or something).
+
+That is very annoying, because every time I want to print something, I need to shutdown the VM, start the printer, and then start the VM (which runs cups as printer server).
+But after printing, I do not want the printer to keep running, so I switch it off.
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