Comment # 128 on bug 1112824 from Wolfgang Rosenauer

XDG_SESSION_TYPE is "x11"
wolfgang@ox:~> ps ax | grep X
 1834 tty7     Sl+    0:00 /usr/bin/Xwayland :1024 -rootless -terminate
-accessx -core -auth /run/user/464/mutter/Xauthority -listen 4 -listen 5
-displayfd 6
 3393 tty2     Sl+    0:02 /usr/bin/X vt2 -displayfd 3 -auth
/run/user/1000/gdm/Xauthority -background none -noreset -keeptty -verbose 3
wolfgang@ox:~> grep -i wayland /etc/gdm/custom.conf 
#WaylandEnable=false

What is the verdict for that output?
Wayland or Xorg? I guess "wayland" but XDG_SESSION_TYPE does not reflect that.