If I have an album, event, etc with a bunch of photos in it, the screensaver should cycle through all of them, shouldn't it? I don't understand why I am watching the same 25ish photos (I haven't counted) from the "top" of my iPhoto album. Choosing another one and switching back results in the same photos being used. How can I make the screensaver do what it should?
Select the photos you want to use for you screen saver on the Apple TV and drop them in the Photo Stream folder in iPhoto or the photo app on an iOS device the select Photo Stream as your screensaver in the Apple TV settings.