24" display locks up unibody MBP

If I connect the display to the MBP, everything works fine. Now I shut the MBP to put it to sleep, disconnect the display and open the MBP. It's now locked up and must be hard reset by holding the Power button. If I disconnect the display first and then shut the MBP, it wakes up just fine.
In other words, the MBP does not like waking up without the 24" display if it was there when it sleeped. Performing the exact same sequence of steps with a Dell monitor (connected via DVI) works as expected.
I'm using a brand new unibody MBP 15" with a brand new 24" LED monitor. Software Update has been run and everything installed.

Hi, pkhata. Yes, there is. You'll need this:
http://store.apple.com/us/product/M8661LL/B?mco=MTIxOTI1OA

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