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Dual monitors (2560 x 1440) via DP chain 2nd monitor not extending

M6600 with Nvidia Quadro 3000M video card through an eport plus dock. Trying to run 2 Dell U2713H 27" at 2560 x 1440 via DP cables. 2nd monitor will only mirror 1st at 2560 x 1440. Laptop doesn't seem to recognize a 2nd monitor. Tried through Win 7 (64-bit) display setup (no extra monitor detected after "detecting") and also NVIDIA control panel (does not recognize additional panel but 2nd panel displays clone of 1st).

I'm trying to use the 2nd monitor in extended mode.

Thank you, Tom.

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