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[Tim Hoffmann <863154@xxxxxxxxxxxxxxxxxx>]

I can confirm the bug in ubuntu 12.4 alpha (64bit) (xorg 1.10.4) on an Asus Eee Slate ep121 Tablet with both the build in wacom digitizer and an usb intuos4 W
As pointed out the problem is not only a gimp (2.6.11) problem. I can generate the lines with the jpen java Tablet library as well.
Since the touch input on the ep121 is currently difficult to get to work, the wacom input is crutial for usability of the device.

Is there any definite confirmation that the bug is fixed in xorg 1.11 ?

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https://bugs.launchpad.net/bugs/863154

Title:
  Wacom Bamboo One tablet random coordinate malfunctions

Status in The GNU Image Manipulation Program (GIMP):
  Unknown
Status in “gimp” package in Ubuntu:
  Confirmed

Bug description:
  The tablet in overall seems to work correctly, with all pressure-
  features working. But quite frequently, while drawing, GIMP seems to
  wrongly read the coordinates of the stylus (as zeros, or negative
  values?), resulting in frequent, random 'line-peaks' in the direction
  of the left and upper image edges. With this bug it is hard to even
  use the tablet, since these problems are very frequent (see the
  exemplary image attached).

  The tablet works with no problems in MyPaint. The bug is reproducible
  in both Unity-2d and Unity-3d.

  I also notice the CPU usage increasing dramatically during drawing
  with any brush.

  Steps to reproduce:
  1. Connect the Wacom Bamboo One tablet
  2. Open GIMP
  3. Start drawing longer strokes with any brush

  Expected result:
  The brush stroke as intended by moving the stylus

  Actual result:
  The brush stroke as intended with frequent, random line-strokes towards image edges

  System: Ubuntu 11.10 oneiric (development branch)
  GIMP version: 2.6.11 (package version: 2.6.11-2ubuntu3)

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