Alright, I couldn't find out what it was supposed to be by the great gazooogle (some say auto, some say manual), so I went to the next best thing,...... my brothers computer, he doesn't tweak it or anything, heck he will not even let me tweak it for him, he just wants it to work he says. I had him look through his and it is started and on auto. He is using windows 7 service pack 1. Hope this helps.
Chris