Only one DVI works on the dock

I just purchased two new Dell U2412M displays (1920x1200) for use with my W530 and dock. I had planned to plug them both into the DVI ports on the dock, but it seems like this is problematic. When I do so, I only get an image out of the display on port 1. The odd thing is that windows actually detects that there is a U2412M attached to both DVI ports, and it allows me to enable the output on both ports, but there is no picture.
It's not the display itself, because I swapped which display was connected to which DVI port on the dock, and now the display connected to port 2 still doesn't work (even though it did when connected to port 1).
Futher, for the time being I decided I would use DVI 1 on the dock, and the mini displayport output on the laptop itself (with the use of a mini DP to DVI adapter), and this works fine (both external displays are working). So it's not the monitors, it is most defininately the "DVI 2" port on the dock.
Is there some odd quirk for using this, or is the dock or laptop simply broken? I would try the Displayport outputs on the dock, but I don't have any full-size displayport cables.
Thanks,
Brad

Hi, tecmec
I would recommend making sure that the BIOS and all other drivers are up to date to make sure that the problem doesn't lie there. But if everything else on the dock works except that port, then I would be inclined to think that the dock has an issue with that port. All the ports that you can test on the computer itself work properly, correct?
Best,
Adam
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