There is a bug upstream about that: http://bugzilla.gnome.org/show_bug.cgi?id=332974. It's closed and states it's not a totem issue. Could you try to use "dbus-monitor --session" as suggested upstream and note what is happening?
** Changed in: totem (Ubuntu)
Importance: Undecided => Low
Status: Confirmed => Needs Info
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[edgy] Screen blanks when watching movies
https://launchpad.net/bugs/66257
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