I personally do not think that it is hardware related, as I never had a problem 
when using the pre xorg-server-1.7 linuxwacom drivers. I think that I've fixed 
the problem by editing the xf86-input-wacom driver source code, though. When I 
say that I "think" I've fixed it, it is due to the fact that the problem seemed 
to occur at random. It hasn't occurred in the approximately two weeks that I've 
used this version of the driver, and it used to happen almost every day.
What I did was reintegrate the old wcmSerialValidate() from a pre xorg-1.7 
version of the linuxwacom drivers into a recent copy of the xf86-input-wacom 
source code from git.

I have attached my edited version of wcmISDV4.c, and I'd love to hear if
it works for any of you.

** Attachment added: "wcmISDV4.c"
   
https://bugs.launchpad.net/ubuntu/+source/xf86-input-wacom/+bug/234466/+attachment/2325743/+files/wcmISDV4.c

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https://bugs.launchpad.net/bugs/234466

Title:
  [hardy] Pen crazy in tablet PC

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