@ Klaus2008

Your one-line solution works like a charm.
I am mystified, since xorg.conf is UNCHANGED.
Even so, the laptop's touchpad IS turned off.
It is gone for both root and knoppix users.

The only problem I see is one would have to
review the /etc/X11/Xsession.d/ entries to have
a clue that a change was made and how to undo it.

Is there a way to transfer a comment on 15x11 to
the changed xorg.conf so as to alert folks to
what's been done?

Anyway, the enormous praise and great fame are
well deserved. Thanks much.