Public bug reported:
On up-to-date 12.04 LTS when running a HVM guest (eg for Windows), if
the option usbdevice='tablet' is given in the configuration then the
idle CPU usage for the guest domain will permanently be around 5-7%.
If this option is removed then the idle CPU usage for the domain is <1%,
but this makes VNC control of the domain very difficult since mouse
movement within VNC is relative instead of absolute.
Due to the high idle CPU usage this makes large scale usage difficult
for Windows virtualization, since the accumulated idle CPU will create a
significant drain on Dom0.
** Affects: xen (Ubuntu)
Importance: Undecided
Status: New
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https://bugs.launchpad.net/bugs/1168201
Title:
usbdevice='tablet' causes high CPU usage for qemu-dm
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