Unity greeter doesn't do anything to control the power management. It runs gnome-settings-daemon to do this. It seems likely the problem is either unity-greeter not configuring / running the correct plugin in g-s-d or g-s-d being broken.
Unity greeter doesn't do anything to control the power management. It runs gnome-settings- daemon to do this. It seems likely the problem is either unity-greeter not configuring / running the correct plugin in g-s-d or g-s-d being broken.