RMBP outputs YPbPr instead of RGB via Thunderbolt/MiniDP?

After hooking up my new RMBP to the external Dell U3011 30" monitor via "mini-displayport to displayport" cable, I'm shocked to find only YPbPr signals are coming from RMBP instead of the regular RBG when connected to its Thunderbolt/Mini-DP port.
This is creating problems when I try to calibrate the external monitor using X-Rite's i1DisplayPro calibrator, which just doesn't work right with YPbPr signals: colors are a bit off with oversaturated red.
Any workarounds to this? Someone suggested the Dual-Link DVI cable from Apple, but I've been reading Apple Store reviews that it won't work with RMBP, is this true?

I kind of hacked my way around and got my Dell U3011 to properly display RGB instead of YPbPr (or YCbCr) over a mini display port to display port cable for my MacBook Pro Retina 15"! WOOHOO! no need for that stupid $150 dual link dvi to mini displayport adapter anymore, which was incredibly flakey and sometimes the monitor turned on, and sometimes it didn't etc... lots of problems.
Download the file from:
http://www.8mmdesign.com/u3011-rgb-ypbpr-fix/DisplayVendorID-10ac.zip
unzip into:
/System/Library/Displays/Overrides
It will create a new directory called:
/System/Library/Displays/Overrides/DisplayVendorID-10ac
Then reboot the system, and it should work. Go to system preferences, displays, color, and set the display profile to Color LCD.
This will *ONLY* work for the Dell u3011 and it is completely UNTESTED. Use at your OWN RISK. But you should have proper RGB colors after doing this.
Good luck!

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    I kind of hacked my way around and got my Dell U3011 to properly display RGB instead of YPbPr (or YCbCr) over a mini display port to display port cable for my MacBook Pro Retina 15"! WOOHOO! no need for that stupid $150 dual link dvi to mini displayport adapter anymore, which was incredibly flakey and sometimes the monitor turned on, and sometimes it didn't etc... lots of problems.
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