I have an xbox and an HDTV. How do I know if the picture I am watching is 480p, 720p or 1080i? I've set my xbox default display settings to indicate that my TV can display all of these formats, but I have no way to confirm which setting is being used at any given time. For example, I know that Enter the Matrix can display 720p as well as 1080i, but I have no idea how to specifiy which to use in the game options. Is the setting in the xbox' defaults, or is it in the game?