New RMBP cannot sleep secondary display

Hi,
I recently got a new MBP, i'm going from a 2009 17" to a 2012 Retina 15".
My old setup had my 17" connected to my dell 3011U 30" secondary display via a minidisplayport->displayport cable. Worked like a charm, no issues. Could do one display or both, and both screens would sleep appropriately.
I now am trying the same thing with my 15", except of course its ports are thunderbolt but apparently do support the minidisplayport just fine. The secondary monitor works well for everything, except it will never go to sleep/turn off.
I've set up a hot corner for "put display to sleep", and when I do only the 15" screen sleeps, my 3011U just stays on in the last frame it was in.
Screen saver seems to work on both screens, but when the time comes to sleep the monitor will remain on (although some times there is no content in it - but it definitely is not asleep).
Any thoughts? Thunderbolt problem? The fact that this worked perfectly on another laptop indicates to me an issue with the new stuff.
Thanks!
Bob

This problem ended up going away on its own. I went to call apple care, and the site said bring it in for a genius appointment. I proctrastinated for a few days, and now it appears the monitor is turning off exactly as expected.

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