Hi Mirek,

Before applying the below code, please consider the following: Although this makes it work on Ubuntu 2021.4 in addition to Linux Mint 20.1 with Wacom, it seems like accepting a bug in Ubuntu and adapting to it. (Pretty much like what we have to do in Windows normally...)

I also tried to address the missing tilt information here by reading gdk_device_get_axes() and behaving accordingly, but that does not seem to work either. Tilt remains constantly on both axis at 0.00787... Is it the same with your XPPEN tablet?

#if GTK_CHECK_VERSION(3, 22, 0)
	GdkDevice *d = gdk_event_get_source_device(event);
	int s=d?gdk_device_get_source(d):0;
	if(d && ((s==GDK_SOURCE_PEN) || (s==GDK_SOURCE_TOUCHSCREEN))) {
		e.pen = true;
		e.pen_barrel = MouseState & GDK_BUTTON3_MASK;
		double *axes = NULL;
		if(event->type == GDK_MOTION_NOTIFY)
			axes = ((GdkEventMotion *)event)->axes;
		if(findarg(event->type, GDK_BUTTON_PRESS, GDK_2BUTTON_PRESS, GDK_3BUTTON_PRESS, GDK_BUTTON_RELEASE) >= 0)
			axes = ((GdkEventButton *)event)->axes;
		if(axes) {
			GdkAxisFlags flags = gdk_device_get_axes (d);
			if(flags & GDK_AXIS_FLAG_PRESSURE) gdk_device_get_axis(d, axes, GDK_AXIS_PRESSURE, &e.pen_pressure);
			if(flags & GDK_AXIS_FLAG_ROTATION) gdk_device_get_axis(d, axes, GDK_AXIS_ROTATION, &e.pen_rotation);
			if(flags & GDK_AXIS_FLAG_XTILT) gdk_device_get_axis(d, axes, GDK_AXIS_XTILT, &e.pen_tilt.x);
			if(flags & GDK_AXIS_FLAG_YTILT) gdk_device_get_axis(d, axes, GDK_AXIS_YTILT, &e.pen_tilt.y);
		}
	}
#endif

Best regards,

Tom