Hi Mirek,

More bad news: It seems that on Ubuntu 2021.4 U++ Pen does not work. Or rather, it works in mouse emulation without any pen specific features.

In Ubuntu settings there is a page for Wacom and there the tablet and pen is configurable and it works (including pressure) in the test-canvas provided by the settings page.

The pen also works in Krita with pressure and all. (I do not know if Krita works on top of Wayland directly or via Xwayland.)

In GIMP, the pen also works correctly. Therein it is configured through Edit > Input Devices. It seems to come in via "xwayland-tablet stylus" device on the list.

Best regards,

Tom

EDIT: In Ubuntu 2021.4 pen is reported as source device called GDK_SOURCE_TOUCHSCREEN instead of GDK_SOURCE_PEN. Pressure can be detected here.