I have installed Qemu 2.0 on an Ubuntu Server 14.04 LTS computer. I use Qemu to run multiple virtual machines. One of them is using Windows 8.1 Pro (x64) and is used for back-ups.
The guest runs fine without any problems. But when I start passing through an usb-device (external hard drive) the mouse (keyboard still works fine) stops working on the vnc client. Reconnecting to the vnc-server does not work. Only a guest reboot will fix this issue.
It appears that this 'bug' only starts when I make the vnc client inactive (clicking somewhere else on another program/service) on the local computer where i run the vnc client from. When I get back (make it active again) to the vnc client/viewer, the mouse stops working/does not respond anymore.
It only happens when I use usb2 controller-mode and only when I add a new usb passthrough device. As long as I don't connect/pass through that usb-device, the mouse still works. But I need this usb2 controller in order for my external hard drives to work properly.
If the guest is on and I connect the external usb hard drive to reproduce this bug, I also notice that if I remove the device then the mouse starts working again. It's like the guest thinks the device is in place of the mouse input device. Still, the hard drive is working fine once it's connected, only the mouse is not.
I can't find any related problems on the internet and I hope someone here can help me solve this problem.