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[Bjarke Todbjerg Nielsen <580719@xxxxxxxxxxxxxxxxxx>]

I am experiencing this problem too on my IBM Thinkpad X41 Tablet running Ubuntu 11.04. Maybe once or twice a day the cursor will begin flickering and skipping between the corner of the screen and the stylus issuing seemingly random button events.
The error messages in the Xorg log are exactly the same as reported by David Perkinson.

The only thing that really seems to take care of the problem
(temporarily) is to suspend and resume the computer.

bjarke@tabix:~$ uname -a
Linux tabix 2.6.38-8-generic #42-Ubuntu SMP Mon Apr 11 03:31:50 UTC 2011 i686 i686 i386 GNU/Linux

bjarke@tabix:~$ xinput --list
⎡ Virtual core pointer                    	id=2	[master pointer  (3)]
⎜   ↳ Virtual core XTEST pointer              	id=4	[slave  pointer  (2)]
⎜   ↳ TPPS/2 IBM TrackPoint                   	id=10	[slave  pointer  (2)]
⎜   ↳ Serial Wacom Tablet stylus              	id=13	[slave  pointer  (2)]
⎜   ↳ Serial Wacom Tablet eraser              	id=12	[slave  pointer  (2)]
⎣ Virtual core keyboard                   	id=3	[master keyboard (2)]
    ↳ Virtual core XTEST keyboard             	id=5	[slave  keyboard (3)]
    ↳ Power Button                            	id=6	[slave  keyboard (3)]
    ↳ Video Bus                               	id=7	[slave  keyboard (3)]
    ↳ Sleep Button                            	id=8	[slave  keyboard (3)]
    ↳ AT Translated Set 2 keyboard            	id=9	[slave  keyboard (3)]
    ↳ ThinkPad Extra Buttons                  	id=11	[slave  keyboard (3)]

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https://bugs.launchpad.net/bugs/580719

Title:
  Pen crazy in tablet PC, Lucid