When the device resumes from suspend and there is no user input, gsd-power remains in the "sleep" state because there is no WakeUpScreen signal such that even when the new idle timer that gsd-power registered after resume triggers, the transition from "sleep" to "sleep" is ignored and the system does not suspend. A second difference to the behavior of Mutter/GNOME Shell is that on resume there is no reset of the registered idle timers which should also be fixed to ensure that Phosh behaves the same.
Act on the logind PrepareForSleep signal (the resume case) to emit the WakeUpScreen signal and reset the idle timers.
Fixes #686 (closed)