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Virtualization guide for 6.1 should mention steps to configure usb tablet autosuspend:

"USB selective suspend allows the guest OS to disable host controller polling,
reducing CPU consumption.

To enable selective suspend for the USB tablet on Linux guests (RHEL6 / SLES11 or newer):

echo auto > /sys/devices/pci0000:00/0000:00:01.2/usb1/1-1/power/level

The configuration is not persistent across reboots.

To enable autosuspend in Windows:

1) Enable "Allow the computer to turn off this
device to save power" checkbox in "Power Management" tab of USB Root Hub
properties.

2) Create a REG_BINARY (XP) or REG_DWORD (Vista/2008) key named
SelectiveSuspendEnabled under:

HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Enum\USB\VID_0627&PID_0001\1\Device
Parameters

With a value of 1.

The configuration is persistent across reboots.

This feature should only be enabled if the hypervisor is RHEL6.1 or newer.
"

Closing since it will be enabled automatically by udev.