here is the output :
$ dbus-monitor --session "interface='org.gnome.ScreenSaver'" signal sender=org.freedesktop.DBus -> dest=:1.3432 serial=2 path=/org/freedesktop/DBus; interface=org.freedesktop.DBus; member=NameAcquired string ":1.3432" method call sender=:1.3 -> dest=org.gnome.ScreenSaver serial=1872 path=/org/gnome/ScreenSaver; interface=org.gnome.ScreenSaver; member=Lock signal sender=:1.2676 -> dest=(null destination) serial=51905 path=/org/gnome/ScreenSaver; interface=org.gnome.ScreenSaver; member=ActiveChanged boolean true signal sender=:1.2676 -> dest=(null destination) serial=51948 path=/org/gnome/ScreenSaver; interface=org.gnome.ScreenSaver; member=ActiveChanged boolean false signal sender=:1.37 -> dest=(null destination) serial=768 path=/org/gnome/ScreenSaver; interface=org.gnome.ScreenSaver; member=ActiveChanged boolean true signal sender=:1.37 -> dest=(null destination) serial=769 path=/org/gnome/ScreenSaver; interface=org.gnome.ScreenSaver; member=ActiveChanged boolean false
here is the output :
$ dbus-monitor --session "interface= 'org.gnome. ScreenSaver' " org.freedesktop .DBus -> dest=:1.3432 serial=2 path=/org/ freedesktop/ DBus; interface= org.freedesktop .DBus; member=NameAcquired gnome.ScreenSav er serial=1872 path=/org/ gnome/ScreenSav er; interface= org.gnome. ScreenSaver; member=Lock gnome/ScreenSav er; interface= org.gnome. ScreenSaver; member= ActiveChanged gnome/ScreenSav er; interface= org.gnome. ScreenSaver; member= ActiveChanged gnome/ScreenSav er; interface= org.gnome. ScreenSaver; member= ActiveChanged gnome/ScreenSav er; interface= org.gnome. ScreenSaver; member= ActiveChanged
signal sender=
string ":1.3432"
method call sender=:1.3 -> dest=org.
signal sender=:1.2676 -> dest=(null destination) serial=51905 path=/org/
boolean true
signal sender=:1.2676 -> dest=(null destination) serial=51948 path=/org/
boolean false
signal sender=:1.37 -> dest=(null destination) serial=768 path=/org/
boolean true
signal sender=:1.37 -> dest=(null destination) serial=769 path=/org/
boolean false