I am sorry, DBus command for poke must be $ dbus-send --session --dest=org.gnome.ScreenSaver --type=method_call --print-reply --reply-timeout=2000 /org/gnome/ScreenSaver org.gnome.ScreenSaver.SimulateUserActivity
It has no effect as well as $ gnome-screensaver-command --poke -- To UNSUBSCRIBE, email to debian-bugs-dist-requ...@lists.debian.org with a subject of "unsubscribe". Trouble? Contact listmas...@lists.debian.org