Comment 25 for bug 1715479

Ok, now I see your problem, To be honest, so far I never
tried to put three fingers on the disabled touchpad and then
issue a click using the trackpoint or an external mouse.

I did it right now and it behaves exactly the way you
wrote: "Sometimes it works, sometimes it doesn't, and sometimes
it acts as if I just grabbed whatever it is that I clicked on."

So yes, I can reproduce this on my T460p.

Now that I payed more attention to it, it appears that when I
use the trackpoint (I'm left-handed), my hand always floats above
the trackpad but never lies directly on it. For the record, I also
have larger hands (but perhaps not as large as yours). I guess this
is the reason why I never encountered this issue. Of course, the
hand position is always a very individual thing, so there are definitely
no "right" or "wrong" ways to use the trackpoint...

In any case, it is weird that that the touchpad input is still somehow
evaluated once it was explicitly disabled. I don't think that this
is how it is supposed to be.

Having said that, I guess part of the issue is that on ThinkPads in general,
the touchpad and the trackpoint are not two separate entities but rather
one piece of hardware. For example, on a T460p the signal from the trackpoint
stick is transferred via the cable that connects the keyboard to the mainboard.
However, the signal from the trackpoint buttons is routed via the same cable
that connects the touchpad to the mobo.