1. cursor reversed and scroll area transposed to left (touchpad mapping rotated 180°)
  2. 'crazy' rapid motion in random directions (I once elicited this by scraping the gap between the touchpad and buttons with my thumbnail)
  3. total lock: no movement whatsoever
  4. slow drift upwards, followed by normal operation
  5. partial freeze, locked into small range of motion which disappears after touching the palmrest and touchpad together.
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