Was it? I could have sworn his sharingan was deactivated at some point. I don't know if I am imagining things but I do remember seing Madara without his sharingan activated. .
Yeah it was activated and then Sasuke started to hyperventilate and passed out. But I recall in one of the recent "next week on Naruto" clips it shows Madara activating his Sharingan. Too bad I cant find it