/var/log/sddm.log

[20:26:52.445] (II) DAEMON: Initializing...
[20:26:53.487] (II) DAEMON: Starting...
[20:26:53.487] (II) DAEMON: Adding new display 0 on vt 7 ...
[20:26:53.512] (II) DAEMON: Adding cookie to "/var/run/sddm/:0"
[20:26:53.723] (II) DAEMON: Display server starting...
[20:26:53.723] (II) DAEMON: Running: /usr/bin/X :0 -auth /var/run/sddm/:0 -nolisten tcp -background none -noreset vt7
[20:26:56.690] (WW) DAEMON: Signal received: SIGUSR1
[20:26:56.690] (II) DAEMON: Running display setup script  "/usr/share/sddm/scripts/Xsetup"
[20:26:56.691] (II) DAEMON: Display server started.
[20:26:56.694] (II) DAEMON: Socket server starting...
[20:26:56.695] (II) DAEMON: Socket server started.
[20:26:56.718] (II) DAEMON: Greeter starting...
[20:26:56.803] (II) HELPER: [PAM] Starting...
[20:26:56.804] (II) HELPER: [PAM] Authenticating...
[20:26:56.804] (II) HELPER: [PAM] returning.
[20:26:56.828] (II) DAEMON: Greeter session started successfully
[20:26:58.946] (II) DAEMON: Message received from greeter: Connect
[20:27:41.523] (II) DAEMON: Message received from greeter: Login
[20:27:41.524] (II) DAEMON: Reading from "plasma.desktop"
[20:27:41.671] (II) HELPER: [PAM] Starting...
[20:27:41.671] (II) HELPER: [PAM] Authenticating...
[20:27:41.753] (II) HELPER: [PAM] Preparing to converse...
[20:27:41.754] (II) HELPER: [PAM] Conversation with 1 messages
[20:27:41.882] (II) HELPER: [PAM] returning.
[20:27:41.944] (II) DAEMON: Authenticated successfully
[20:27:42.116] (II) HELPER: Starting: "/usr/share/sddm/scripts/Xsession" "/usr/bin/startkde"
[20:27:42.143] (II) HELPER: Adding cookie to "/home/serge/.Xauthority"
[20:27:42.217] (II) DAEMON: Session started
[20:27:42.235] (II) HELPER: [PAM] Ended.
[20:27:42.237] (II) DAEMON: Auth: sddm-helper exited successfully
[20:27:42.237] (II) DAEMON: Greeter stopped.