Archived from groups: comp.sys.laptops (More info?
I'm late to this thread - forgive me if I repeat what's already been
The Thinkpad Trackpoint logic dynamically calibrates its sensors by
trying to recognize the "no input" state and calibrating that as neutral.
As a result - if you very gently rest your finger on the Trackpoint -
so lightly that it doesn't move, or sometimes, if you leave enough
pressure to move the mouse, but keep up the same constant pressure even
after the mouse goes off the screen - then the Trackpoint will
recalibrate that as neutral. Now, if you take your finger off, the
Trackpoint will start to move!
To recalibrate again, just leave everything alone for a short while,
so that the above described logic again detects "no input" and
If this doesn't work, you must consider defective hardware - I've seen
reports of very occasional failures of this mechanism.