Comment # 9 on bug 1120405 from Tobias Havla

I've managed to get the serial Wacom tablet working under Xorg (looked at the
Xorg.0.log wacom error). I've added myself to the dialout group (see attached
contents of /dev/) and after a relogin the digitizer and touchscreen are
working fine. I don't know if this is intentional, but even if it is, it should
be documented somewhere.

Other than that, this didn't "fix" the Wacom tablet under Wayland. It still
doesnt' work, even with the user in the dialout group and after rebooting the
system. (btw.: GDM is my login manager)