It looks like this bug has been previously reported on the libinput
database as bug 102632 and they marked it WONTFIX. This touchscreen
worked fine with Ubuntu 16.04 (which used evdev), so I am trying to
figure out how that worked.
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Public bug reported:
EGalax touch screen "Pen" is identified (apparently by udev) as a
tablet. libinput then ignores the "Pen" and the touchscreen does not
work.
*** Part of output from journalctl ***
May 18 13:56:09 BL2-2K /usr/lib/gdm3/gdm-x-session[1082]: (II) event5 - eGalax
Inc. USB TouchC
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