Using X11, the logout greeter appears as it should: darkens and overlays the screen. Using Wayland, the logout greeter appears as a large window titled ksmserver-logout-greeter whose background is completely black. Overlays are definitely possible with kwin-wayland, so why this behavior?
same here with plasma 5.12 beta. duplicate of https://bugs.kde.org/show_bug.cgi?id=381045 ?
*** This bug has been marked as a duplicate of bug 381045 ***