RE: U2715H E6530 ePort Plus Docking Station DisplayPort 1.2 Daisy Chain Multi-Monitor Individual Recognition Windows 8.1
Unfortunately I was not able to find any information that the NVS 5200m chip on the 6530 doesn't supports DP 1.2. With the resolutions that the two U2715h monitors are capable of I am not sure that system performance would have been great even if the video chip did support 1.2. I am sorry that I don't have better news for you.
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