Originally Posted by
slide I've tried two cases one of which is specific to the 3. Neither case puts my 3 to sleep. Yes, my setting is set properly. It's the case's fault. I may hit the Apple store later today to ask them what cases they've experienced which work.
A simple check is to turn over the cover so the outer side of the front cover covers the spot on the iPad and see if the sleep works. See the video in the blog I referenced above for more details.