This is hard to describe. Let me describe it like this. Consider 4
vertical lines. Between lines A and B is the area of the touchpad that
affects movement of the mouse. Between lines C and D is the area of the
touchpad that performs scrolling.

In the previous xinput command, 1632 is line A, and 5312 is line B. Line
C seems to always be the same as line B. If line B is moved to the left,
then the width of the scroll area increases. If line B is moved to the
right, the scroll area decreases.

Line D never moves. So, if line B (and C) move to the right of D, then
the scroll area has a negative width, which results in scrolling being
completely disabled.

Does that make sense?

-- 
Soltech TA12 touchpad scrolling area not flush to the right
https://bugs.launchpad.net/bugs/403869
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