Tip: If you have lowest screen brightness and want it even darker, then hit the battery saver and screen will get darker than lowest screen brightness.
Bug: If you have next lowest brightness and hit battery saver, the screen will get totaly dark (turned off) and you need to restart the phone.
Bug: If you have next lowest brightness and hit battery saver, the screen will get totaly dark (turned off) and you need to restart the phone.