I have Lenovo W530 laptop with Quadro K1000M graphics card with a docking station.
I can connect 2 DVI + 1 VGA but I cannot connect 2 DVI + 1 DisplayPort.
Is there some inherent limitation while using DVI + DisplapyPort?
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It sounds like the real answer is here, where it describes what I believe is your dock:
Mini Dock Plus (90W & 170W): 1x VGA, 2x DVI, 2x DP
Many systems allow for two of these video ports to be used simultaneously. Select systems, including those with NVIDIA Optimus technology, allow for up to three video ports on the dock to be used simultaneously.
More details about this can be seen in the user's guide, which shows a line separating out the first two video ports (a DisplayPort and a DVI) from the second ground of ports (DisplayPort, DVI, and VGA).
Finally, some hints at this link, showing how to get 3 external displays. Looks like for the W530, you have to have the 170W dock for 3 external displays. The schematic at the end of that page suggests the first pair of ports (DP and DVI) is one, the second set is another, and the VGA is another display.
Some video cards have limitations. I have a video card where the HDMI slot and the 2nd DVI slot share a connection. You can use one or the other. I'm sure this is probably the case in your situation with the DVI and DP ports. Also, does your Display Port use an adapter to DVI? If so, you may need to purchase what is called an "Active" adapter for Display Port to DVI. Without an active adapter, you will be limited to how many screens you can operate.
There are two digital video ports on the laptop. You can use a DVI or Displayport with each in any combination. The ports on the dock are clearly labelled: there's a DVI and a Displayport for one, and a DVI and a Displayport for the other. IF you try to plug in three monitors using these sockets you are plugging two monitors into one port, and it simply doesn't work.
The only way to get three monitors is if one of them is VGA.