Comment 3 for bug 1311966

from irc this morning, sounds like the pause occurs due to greeter no longer being blocked (as in eglswapbuffers no longer blocking) in order to transition to the locked state. I suspect if the desire is to pause on screen blank in this case, its another instance of the playback engine needing to listen to Unity.Screen DisplayPowerStateChange to act immediately. otherwise, it'll need to be whitelisted somehow.