Public bug reported:

After a while the mouse pointer runs over the screen along a straight line 
(upwards, downwards, diagonal etc.) if the numpad mouse was enabled using 
setxkbmap -option keypad:pointerkeys
This bug will be difficult to reproduce as it seems to occur randomly and only 
in certain setups. I encounter it working under KDE 4.9 on Ubuntu 12.04 (also 
previous versions) which was why I asked here:
http://forum.kde.org/viewtopic.php?f=111&t=106913
I encounter it only working in dual screen setup with external keyboard and 
mouse (both Logitech) attached to my Lenovo T61 thinkpad. So far not if I do 
indeed use the numpad mouse but when it was left on unintentionally (not 
deactivated by pressing Shift+Num-Lock ). 
The movement of the pointer can be compensated by moving the mouse in the 
opposite direction but the pointer runs too fast to perform a secure 
logout/reboot. At the same time the system does not react to keyboard input.
This is a serious bug which forces the user to force reboot the system without 
any chance to close unsaved files.

** Affects: xorg (Ubuntu)
     Importance: Undecided
         Status: New

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https://bugs.launchpad.net/bugs/1060970

Title:
  Mouse pointer goes crazy

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