I can confirm similar behaviour on 14.04 64-bit with ETPS/2 Elantech Touchpad.
As soon as I attach an external monitor over VGA, my touchpad loses precision: 
the cursor fidgets as I move it around. I can barely aim it at a button to 
click.

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https://bugs.launchpad.net/bugs/726832

Title:
  Touchpad speed scales with multimonitor size per axis

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