I have encountered such issue and I have found a semi-solution. I usually don't use mouse (just mousekeys and touchpad), but for games, I do.
There is an exiting input proxy mechanism. It was originally intended for sys-usb->dom0, but other combinations can work, too. As far as I remember, it does not work with the standard X11 instance in AppVM. Instead, I had to run a VNC loopback session. This also required the service file in target VM to set DISPLAY environment variable. If someone is interested, I can look for details. Maybe I have something already posted here. -- You received this message because you are subscribed to the Google Groups "qubes-users" group. To unsubscribe from this group and stop receiving emails from it, send an email to qubes-users+unsubscr...@googlegroups.com. To post to this group, send email to qubes-users@googlegroups.com. To view this discussion on the web visit https://groups.google.com/d/msgid/qubes-users/07c36e37-e419-4cb8-b697-51afde670103%40googlegroups.com. For more options, visit https://groups.google.com/d/optout.