If using GNOME wayland right now, no GTK2 application (this includes GIMP and xournal, but also just any regular applications & their UIs and buttons and all) will respond to the wacom pen. Comments on this fedora bug report have indicated this might be an upstream problem in Wayland or XWayland: https://bugzilla.redhat.com/show_bug.cgi?id=1362206
This means that effectively, on any machine with a wacom pen that is actually used by the user, Wayland isn't really an option and won't be until either this is fixed or all GTK2 applications in use migrated to GTK3 - which doesn't really seem to be realistically happening any time soon.
Therefore, this should be addressed given that I assume standalone X11 is planned to be phased out eventually in the near future.
(This bug is also the only reason I am still using the GNOME X11 session on my laptop instead of a new shiny Wayland session.)
Peter, is this just a missing implementation in Xwayland or something more sinister?
(In reply to Pekka Paalanen from comment #1)
> Peter, is this just a missing implementation in Xwayland or something more
Yeah, we don't have any pen/tablet support in Xwayland at all.
In case this is any easier, I am sure actual pen-heavy applications like xournal or GIMP which require detail input can be convinced to port to GTK3 to get proper advanced pen events. (googling for both reveals both projects already made significant progress on porting efforts)
However, the problem is that the pen doesn't even appear to emit the most basic mouse events on GTK2, making them effectively entirely unusable with the pen even if they don't require any pressure strength or any other sort of special pen events.
So it would probably be sufficient if just basic emulated mouse events were generated, if that saves you any time. (and then xournal/GIMP would need to be informed that GTK3 is required for proper operation under Wayland, since at least xournal seems to have almost fully ported but then abandoned it since they saw no good reason to switch)
As daniels said, this is a generic issue: XWayland is missing tablet support. I'll try to bump this up in my todo list
Since it's been half a year, please allow me to ask if there's any updates on this issue...
tablet support was merged in februrary with the commits leading up to 8475e6360ce31551d50fd63a26f7a44d1e8928f2
Ok, great. from the user point of view I guess the question then shifts to when will xorg-server 1.20 be released and picked up by distros
Thanks for the support
FWIW, it looks like those patches for wacom in xorg-server 1.20 apply without too much trouble to 1.19.3 (see https://bugs.launchpad.net/ubuntu/+source/xorg-server/+bug/1712571). My wacom tablet works nicely now with the patched xorg-server on xwayland apps like firefox and gimp.