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[codeslinger <codeslinger@xxxxxxxxxxxxx>]

I had the same problem   "jumps erratically"   if any part of my hand even lightly brushed the mousepad.  This is on an HP dv7.
The problem with erratic mouse was so bad that it was nearly unusable.

I tried Ivan's fix above -- adding    Option "JumpyCursorThreshold" "90"

and that solved my problem!!!  at least as far as having a usable mouse
goes.  It still jumps a little but is very acceptable.

on the other hand I believe that this mousepad is designed to support
multi-touch, but I don't see any apparent multi-touch behaviour???

meanwhile, the RIGHT mouse button continues to not work, but that is a
separate bug.

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https://bugs.launchpad.net/bugs/503944

Title:
  erratic cursor movement with multi touch