# journalctl | grep -i plasma
Aug 17 15:49:39 obikawa14 sddm-greeter[1794]: Reading from
"/usr/share/xsessions/plasma5.desktop"
Aug 17 15:49:39 obikawa14 sddm-greeter[1794]: Reading from
"/usr/share/wayland-sessions/plasmawayland.desktop"
Aug 17 15:49:47 obikawa14 sddm-greeter[1794]: Reading from
"/usr/share/wayland-sessions/plasmawayland.desktop"
Aug 17 15:49:47 obikawa14 sddm[1762]: Reading from
"/usr/share/wayland-sessions/plasmawayland.desktop"
Aug 17 15:49:47 obikawa14 sddm[1762]: Reading from
"/usr/share/wayland-sessions/plasmawayland.desktop"
Aug 17 15:49:47 obikawa14 sddm[1762]: Session
"/usr/share/wayland-sessions/plasmawayland.desktop" selected, command:
"dbus-run-session /usr/bin/startplasmacompositor"
Aug 17 15:49:47 obikawa14 sddm-helper[1850]: Starting:
"/usr/share/sddm/scripts/wayland-session dbus-run-session
/usr/bin/startplasmacompositor"
Aug 17 15:49:51 obikawa14 ksmserver[1981]: org.kde.kf5.ksmserver: Starting
autostart service  "/etc/xdg/autostart/org.kde.plasmashell.desktop"
("/usr/bin/plasmashell")
Aug 17 15:49:53 obikawa14 plasmashell[1999]: org.kde.plasmaquick: Applet
preload policy set to 1
Aug 17 15:49:53 obikawa14 plasmashell[1999]: Using Wayland-EGL
Aug 17 15:49:53 obikawa14 plasmashell[1999]: The EGL implementation does not
support the Wayland platform

After I had added the X11:Xorg repository in order to get fixes for another bug
my desktop is no longer rendered by the proper driver. When I tried looking at
the logs by myself, I could not find anything indicating the source of the
problem. The above fragment is the only thing that I could find that indicates
that something went wrong.

The X11:Xorg repository has the top priority in my system and I had used the
"zypper dup --allow-vendor-change" command.