Mutter doesn't apply gsettings appropriately to Wacom tablet on Xorg, but Wayland works

[Fernando]

I have a Wacom Intuos VT M tablet in a setting with two monitors (laptop + external). Under an up-to-date Ubuntu Focal running X, if I map the tablet to a single monitor it fails to map it more often than not. A reliable way of getting failure is first connecting the tablet via bluetooth and then via USB. The only way to revert to a correct behavior is reseting X (ALT+F2 r). This is necessary even after rebooting.

I've noticed that, when not working well, the problem is that Mutter sends the mapping data to the "Wacom Intuos BT M Pad pad" device, while it should be sending them to "Wacom Intuos BT M Pad stylus" (this is what it does when it works well).

Under Wayland it works well (well, the tablet buttons don't work under Wayland but this is unrelated).

PS I reported this bug against the Wacom X driver but was told it's really related to mutter (https://github.com/linuxwacom/xf86-input-wacom/issues/148).

[tylerecouture (tylerecouture)]

If this is the same problem I'm having (https://bugs.launchpad.net/ubuntu/+source/gnome-control-center/+bug/1901279)

Then a workaround that works for me is to set the display with `xsetwacom` using coords or HEAD-1 (VGA-1 and DP-3 type identifiers aren't working)

$ xsetwacom --set "Wacom Intuos Pro S Pen stylus" MapToOutput 1920x1080+0+0