There is a known issue with Mini-displayport > Displayport connections to the U2410. The monitor gets recognized as a TV so the native resolution can never be achieved and the picture looks like garbage. There is a thread somewhere on here chronicling the issue.
I did a week research for this subject. I found this. I connect my MBP to Dell U2311H and it display full resolution! Ordered it on Monday and got it Wednesday!
There is a known issue with Mini-displayport > Displayport connections to the U2410. The monitor gets recognized as a TV so the native resolution can never be achieved and the picture looks like garbage. There is a thread somewhere on here chronicling the issue.