Which display manager are these systems using? I noticed this affects sddm (which is installed with KDE) but not with lightdm.
I've attached a debug log whilst using sddm that indicates the cause may be a NULL DBus path: [init_session_id] gs-listener-dbus.c:2011 (12:28:15): Got session-id: /org/freedesktop/login1/session/_32 [init_session_id] gs-listener-dbus.c:2016 (12:28:15): Got sd-session-id: 2 [query_seat_path] gs-listener-dbus.c:2063 (12:28:15): org.freedesktop.DBus.Error.UnknownObject raised: No such object path '/org/freedesktop/DisplayManager/Session1' ** Attachment added: "light-locker --debug whilst running with sddm" https://bugs.launchpad.net/ubuntu/+source/light-locker/+bug/1500925/+attachment/4663785/+files/light-locker.log -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1500925 Title: Ubuntu 15.10 Idle freezing/screen not waking up To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/light-locker/+bug/1500925/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
