MBP 2011 Does Not Enter Display Sleep Over DVI with Dell U2410

Hi, 15" 2011 MacbookPro (8,2) running 10.7.2 Lion
Using the Apple Mini DisplayPort-to-DVI adapter, the Dell U2410 does not enter Display sleep in Energy Saver mode. Instead, the backlight remains on.
If I manually put the MBP to Sleep, the U2410 successfully enters Display sleep.
When using a MonoPrice Mini DisplayPort-to-DisplayPort cable, the monitor successfully enters Display Sleep. However, the picture signal (no matter what) is dispalyed in YPbPr rather than RGB for some reason. So this thread is in fact 2 problems.
Any ideas / help?

My late 2007 white MacBook (3,1) running 10.6.8 connected via MiniDVI-to-DVI successfully puts the U2410 to sleep.
So I'm thinking this may be an issue with the MDP/Thunderbolt port on the new 2011 MBP's?

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