Having bought a snazzy XP-Pen 22 Pro through Amazon, I discovered that the pen didn't work on Elive 3.7.x
Searching around i found the solution to be relatively simple. And hey .... it works.
Elive 3.8.8, lately using the 5.4.0 kernel recognizes the pointer/pen correctly using evdev and usbhid. The above .deb file will not install due to errors but has in fact become unnecessary.
https://www.xp-pen.com/download-483.html
and unzip and extract the tar.gz file it contains. From that directory run "sudo zsh Pentablet_Driver.sh " --- you specifically need zsh there as the expected "bash" has some problems. Or use "elive run file helper". 😉
NB. The opened window has to stay open to be able to use the pen as it runs from /tmp (for now) and there is an issue with xrandr that requires a cloning of your main screen as the pointer calibration will otherwise try to span both screens i.e it acts like a mouse.
:
When using screens next to each other aka not-cloned.
Find out what screen is being used by the tablet using "xandr" (on mine HDMI-2) and find the pen's id using "xinput" (on mine id = 19).
After which you can map the poitnter thus:
"xinput map-to-output 19 HDMI-2"
(as is in my case)
Your mouse will still be able to reach the tablet screen but the pen will be calibrated nicely to the tablet's edges.
Have fun!