This also happens to me, and this even happens when suspending to ram. Sometimes I suspend to ram and at resume I find the logout screen there again (and I see it close before suspension), other times it just suspends again right after resume - duplicate "power button" events should somewhat be discarded by acpid but I am not sure on how.
** Also affects: acpi-support (Ubuntu) Importance: Undecided Status: Unconfirmed -- Logout screen appears twice [Feisty] https://launchpad.net/bugs/81227 -- desktop-bugs mailing list desktop-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/desktop-bugs