Hi! I noticed that loginctl lock-sessions has no effect with gnome-screensaver, because the session-id is escaped in session_bus_path() from systemd-201/src/login/logind-session-dbus.c, and the matching session-id is considered unescaped in _listener_message_path_is_our_session() from gnome-screensaver-3.6.1/src/gs-listener-dbus.c. In my case all session-id reported by loginctl list-sessions are numerical values, so the difference between the escaped and the unescaped string is just the initial digit, that is replaced by its hex ascii value (_3X for digit X), for example with session-id=1 : [listener_dbus_handle_system_message] gs-listener-dbus.c:854 (10:42:21): obj_path=/org/freedesktop/login1/session/_31 interface=org.freedesktop.login1.Session method=Lock destination=(null) I don't know where the fix makes sense the most, to not escape session-id in systemd, or to unescape it properly in gnome-screensaver.
*** Bug 968521 has been marked as a duplicate of this bug. ***
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Hm, wasn't this fixed at some point?
Yes. I cannot reproduce the bug in Fedora 20 (session locking is now handled by gnome-shell). I close this bug.