Wacom doesn't work after suspend w/o trick

Hi, I'm having an issue with my Wacom tablet PC on an unmodified install of 64-bit 12.04.1 on an HP 2710p, where the cursor follows the pen just fine on first boot, and *sometimes* after resuming from a suspended state (which I put the computer into frequently, around 8 times/day).

It seems like Xinput or some hardware service like udev is pruning inactive devices on resume, so my workaround is holding the pen to the screen before pressing the power switch, which guarantees that the pen works once the system resumes.

I don't know how to really track down what could cause this, I've tried investigating what scripts get called on resume among other things, but there is a possibility that all this "pruning", if it exists, is done within X. If anyone has any hints or suggestions, I'd be glad to test them out.

The Version number for xserver-xorg-input-wacom is 1:0.14.0-0ubuntu2

Thanks kindly.