With the latest sddm-qt6 version 0.21.0, it appears to just be ignoring the configuration file in /etc/sddm.conf.d, when trying to set a wayland session, and defaulting to an X11 session. Looking at the logs, it doesn't even appear to be trying to start a wayland session for sddm, with DisplayManager=wayland set. Mar 17 14:10:38 mustang sddm[1480]: Initializing... Mar 17 14:10:38 mustang sddm[1480]: Starting... Mar 17 14:10:38 mustang sddm[1480]: Logind interface found Mar 17 14:10:38 mustang sddm[1480]: Adding new display... Mar 17 14:10:38 mustang sddm[1480]: Loaded empty theme configuration Mar 17 14:10:38 mustang sddm[1480]: Xauthority path: "/run/sddm/xauth_TPeelf" Mar 17 14:10:38 mustang sddm[1480]: Using VT 2 Mar 17 14:10:38 mustang sddm[1480]: Display server starting... Mar 17 14:10:38 mustang sddm[1480]: Writing cookie to "/run/sddm/xauth_TPeelf" Mar 17 14:10:38 mustang sddm[1480]: Running: /usr/bin/X -nolisten tcp -background none -seat seat0 vt2 -auth /run/sddm/xauth_TPeelf -noreset -displayfd 16 Mar 17 14:10:39 mustang sddm[1480]: Setting default cursor Mar 17 14:10:39 mustang sddm[1480]: Running display setup script "/usr/etc/X11/xdm/Xsetup" Mar 17 14:10:39 mustang sddm[1480]: Display server started. Mar 17 14:10:39 mustang sddm[1480]: Socket server starting... Mar 17 14:10:39 mustang sddm[1480]: Socket server started. Mar 17 14:10:39 mustang sddm[1480]: Loading theme configuration from "/usr/share/sddm/themes/breeze/theme.conf" Mar 17 14:10:39 mustang sddm[1480]: Greeter starting... Mar 17 14:10:39 mustang sddm-helper[1510]: [PAM] Starting... Mar 17 14:10:39 mustang sddm-helper[1510]: [PAM] Authenticating... Mar 17 14:10:39 mustang sddm-helper[1510]: [PAM] returning. Mar 17 14:10:39 mustang systemd-logind[1156]: New session 1 of user sddm. Mar 17 14:10:39 mustang (systemd)[1513]: pam_unix(systemd-user:session): session opened for user sddm(uid=471) by sddm(uid=0) Mar 17 14:10:39 mustang systemd[1]: Started Session 1 of User sddm. Mar 17 14:10:39 mustang sddm-helper[1510]: pam_unix(sddm-greeter:session): session opened for user sddm(uid=471) by sddm(uid=0) Mar 17 14:10:39 mustang sddm-helper[1510]: pam_kwallet5(sddm-greeter:session): pam_kwallet5: pam_sm_open_session Mar 17 14:10:39 mustang sddm-helper[1510]: pam_kwallet5(sddm-greeter:session): pam_kwallet5: open_session called without kwallet5_key Mar 17 14:10:39 mustang sddm-helper[1510]: Writing cookie to "/tmp/xauth_RhbaQU" Mar 17 14:10:39 mustang sddm-helper[1510]: Starting X11 session: "" "/usr/bin/sddm-greeter-qt6 --socket /tmp/sddm-:0-oScEPt --theme /usr/share/sddm/themes/breeze" Mar 17 14:10:39 mustang sddm[1480]: Greeter session started successfully Mar 17 14:10:39 mustang sddm-greeter-qt6[1533]: High-DPI autoscaling Enabled Mar 17 14:10:39 mustang sddm-greeter-qt6[1533]: Reading from "/usr/local/share/wayland-sessions/plasmawayland.desktop" Mar 17 14:10:39 mustang sddm-greeter-qt6[1533]: Reading from "/usr/share/wayland-sessions/plasmawayland.desktop" Mar 17 14:10:39 mustang sddm-greeter-qt6[1533]: Reading from "/usr/local/share/wayland-sessions/weston.desktop" Mar 17 14:10:39 mustang sddm-greeter-qt6[1533]: Reading from "/usr/share/wayland-sessions/weston.desktop" Mar 17 14:10:39 mustang sddm-greeter-qt6[1533]: Loading theme configuration from "/usr/share/sddm/themes/breeze/theme.conf" Mar 17 14:10:39 mustang sddm-greeter-qt6[1533]: Connected to the daemon. Mar 17 14:10:39 mustang sddm[1480]: Message received from greeter: Connect Mar 17 14:10:39 mustang sddm-greeter-qt6[1533]: Loading file:///usr/share/sddm/themes/breeze/Main.qml... Mar 17 14:10:39 mustang sddm-greeter-qt6[1533]: QObject: Cannot create children for a parent that is in a different thread. Mar 17 14:10:39 mustang sddm-greeter-qt6[1533]: QObject: Cannot create children for a parent that is in a different thread. Mar 17 14:10:39 mustang sddm-greeter-qt6[1533]: QObject: Cannot create children for a parent that is in a different thread. Mar 17 14:10:39 mustang sddm-greeter-qt6[1533]: QObject: Cannot create children for a parent that is in a different thread. Mar 17 14:10:39 mustang sddm-greeter-qt6[1533]: QObject: Cannot create children for a parent that is in a different thread. Mar 17 14:10:39 mustang sddm-greeter-qt6[1533]: QObject: Cannot create children for a parent that is in a different thread. Mar 17 14:10:40 mustang dbus-daemon[1148]: [system] Activating via systemd: service name='org.freedesktop.UDisks2' unit='udisks2.service' requested by ':1.19' (uid=471 pid=1533 comm="/usr/bin/sddm-greeter-qt6 --socket /tmp/sddm-:0-oS" label="unconfined_u:unconfined_r:unconfined_t:s0-s0:c0.c1023") Mar 17 14:10:40 mustang dbus-daemon[1148]: [system] Activating via systemd: service name='org.freedesktop.UPower' unit='upower.service' requested by ':1.19' (uid=471 pid=1533 comm="/usr/bin/sddm-greeter-qt6 --socket /tmp/sddm-:0-oS" label="unconfined_u:unconfined_r:unconfined_t:s0-s0:c0.c1023") Mar 17 14:10:40 mustang dbus-daemon[1540]: [session uid=471 pid=1540] Activating via systemd: service name='org.freedesktop.portal.Desktop' unit='xdg-desktop-portal.service' requested by ':1.0' (uid=471 pid=1533 comm="/usr/bin/sddm-greeter-qt6 --socket /tmp/sddm-:0-oS" label="unconfined_u:unconfined_r:unconfined_t:s0-s0:c0.c1023") Mar 17 14:10:40 mustang sddm-greeter-qt6[1533]: Adding view for "eDP-1" QRect(0,0 1920x1200) Mar 17 14:10:40 mustang sddm-greeter-qt6[1533]: QDBusConnection: name 'org.freedesktop.UDisks2' had owner '' but we thought it was ':1.20' Mar 17 14:10:40 mustang sddm-greeter-qt6[1533]: QDBusConnection: name 'org.freedesktop.UPower' had owner '' but we thought it was ':1.21' Mar 17 14:10:40 mustang sddm-greeter-qt6[1533]: Message received from daemon: Capabilities Mar 17 14:10:40 mustang sddm-greeter-qt6[1533]: Message received from daemon: HostName Mar 17 14:10:59 mustang sddm-greeter-qt6[1533]: file:///usr/share/sddm/themes/breeze/Main.qml:241:17 Parameter "username" is not declared. Injection of parameters into signal handlers is deprecated. Use JavaScript functions with formal parameters instead. Mar 17 14:10:59 mustang sddm-greeter-qt6[1533]: Reading from "/usr/share/wayland-sessions/plasmawayland.desktop" Mar 17 14:10:59 mustang sddm[1480]: Message received from greeter: Login Mar 17 14:10:59 mustang sddm[1480]: Reading from "/usr/share/wayland-sessions/plasmawayland.desktop" Mar 17 14:10:59 mustang sddm[1480]: Session "/usr/share/wayland-sessions/plasmawayland.desktop" selected, command: "/usr/libexec/plasma-dbus-run-session-if-needed /usr/bin/startplasma-wayland" for VT 3 Mar 17 14:10:59 mustang sddm-helper[1621]: [PAM] Starting... Mar 17 14:10:59 mustang sddm-helper[1621]: [PAM] Authenticating... Mar 17 14:10:59 mustang sddm-helper[1621]: pam_kwallet5(sddm:auth): pam_kwallet5: pam_sm_authenticate Mar 17 14:10:59 mustang sddm-helper[1621]: [PAM] Preparing to converse... Mar 17 14:10:59 mustang sddm-helper[1621]: pam_kwallet5(sddm:auth): pam_kwallet5: Couldn't get password (it is empty) Mar 17 14:10:59 mustang sddm-helper[1621]: [PAM] Conversation with 1 messages Mar 17 14:10:59 mustang sddm-helper[1621]: [PAM] returning. Mar 17 14:10:59 mustang sddm[1480]: Authentication for user "sfalken" successful Mar 17 14:10:59 mustang sddm-helper[1621]: pam_kwallet5(sddm:setcred): pam_kwallet5: pam_sm_setcred Mar 17 14:10:59 mustang sddm-greeter-qt6[1533]: Message received from daemon: LoginSucceeded Mar 17 14:10:59 mustang sddm-helper[1510]: [PAM] Closing session Mar 17 14:10:59 mustang sddm-helper[1510]: pam_unix(sddm-greeter:session): session closed for user sddm Mar 17 14:10:59 mustang sddm-helper[1510]: pam_kwallet5(sddm-greeter:session): pam_kwallet5: pam_sm_close_session Mar 17 14:10:59 mustang sddm-helper[1510]: [PAM] Ended. Mar 17 14:10:59 mustang sddm[1480]: Auth: sddm-helper exited successfully Mar 17 14:10:59 mustang sddm[1480]: Greeter stopped. SDDM::Auth::HELPER_SUCCESS Mar 17 14:10:59 mustang sddm-helper[1621]: pam_unix(sddm:session): session opened for user sfalken(uid=1000) by sfalken(uid=0) Mar 17 14:10:59 mustang sddm-helper[1621]: pam_kwallet5(sddm:session): pam_kwallet5: pam_sm_open_session Mar 17 14:10:59 mustang sddm-helper[1654]: pam_kwallet5: final socket path: /run/user/1000/kwallet5.socket Mar 17 14:10:59 mustang sddm-helper[1621]: pam_wtmpdb(sddm:session): open_database_rw: Cannot create/open database (/var/lib/wtmpdb/wtmp.db): unable to open database file Mar 17 14:10:59 mustang sddm-helper[1621]: Starting Wayland user session: "/usr/share/sddm/scripts/wayland-session" "/usr/libexec/plasma-dbus-run-session-if-needed /usr/bin/startplasma-wayland" Mar 17 14:10:59 mustang sddm-helper[1656]: Jumping to VT 3 Mar 17 14:10:59 mustang sddm-helper[1656]: VT mode didn't need to be fixed Mar 17 14:11:00 mustang sddm[1480]: Session started true Mar 17 14:11:00 mustang sddm-helper[1621]: Failed to write utmpx: No such file or directory