Might this be related to trackstick emulation mode?
>From man synaptics:
Trackstick emulation mode is entered when pressing the finger hard on
the touchpad. The FingerPress parameter controls the minimum required
finger pressure. If the finger hasnât moved more than MaxTapMove after
MaxTapTime has elapsed, trackstick mode is entered. In this mode, movâ
ing the finger slightly in any direction gives a speed vector that
moves the pointer. The TrackstickSpeed parameter controls the ratio
between pointer speed and finger movement distance. Trackstick mode is
exited when the finger pressure drops below FingerLow or when the finâ
ger is moved further than MaxTapMove away from the initial position.
Try setting the aforementioned FingerPress option to an arbitarily high value,
such as:
Options "FingerPress" "254"
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[hardy kde4] erratic trackpad behaviour after upgrade from gutsy
https://bugs.launchpad.net/bugs/223013
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