06-19-2016 12:37 AM
I think most users know that TrackPoint has an auto-correction mechanism to avoid permanent physical tilt.
That is, when TrackPoint is pushed towards a direction with constant force for several seconds, that direction will be corrected as "zero-point". Therefore you'll observe a counter-movement when releasing TrackPoint.
What I want to mention is that, back on X220, if you press middle-button when pushing TrackPoint, the above mechanism will never be triggered regardless of how long or how hard you push. This is a correct and thoughtful design, because when middle-button is pressed, such tilt should be user-generated rather than permanent physical.
However, on X1 Carbon (3rd gen), the auto-correction mechanism will be triggered even when middle-button is pressed. This is NOT a correct behaviour.
I guess such behaviour is coded in Synaptics driver. If so, please kindly contact them to correct this behaviour.