Dell monitors connected with YPbPr instead of RGB

When I connect Mountain Lion Mac to Dell monitors with miniDP-DisplayPort cable, Mac uses YPbPr color instead of RGB.
When I calibrate my monitor with x-rite or datacolor, it shows terrible results.
Lion has not a same problem. And miniDP-DVI cable in Mountain Lion has not a problem, too.
I googled about it, finally found the solution. http://embdev.net/topic/284710
But Apple has to fix this problem.

http://bugreport.apple.com/
Though, I have a Dell monitor and it allows you to choose between YPbPR and RGB in the on-screen menu.  Are you sure yours doesn't allow this too?

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