Displayport splitter showing as "PnP montor" in Windows and monitors are blank

T430 laptop with Intel 4000 + Mini Dock Plus Series 3 docking station 2x(DP+DVI) + Windows 7 64 bit, 3 monitors:
1. 1920x1080 Dell monitor connected to the docking station DVI port 1, main monitor, works fine
2. Laptop's own LCD (1600x900) detected but manually disabled
3. Two 1680x1050 monitors connected to the Lenovo DP splitter box (OEM company is IDT?) which is connected to the docking station DP port 2. The DP splitter is shown as "PnP montor" (typo as shown) with 1280x1024 as the highest resolution but the two monitors connected to it detect no signal.
Windows detects the first two fine. But does not seem to be able to detect the DP splitter box properly? I saw a post on the net showing the same Lenovo DP splitter being detected by Windows as "IDT VMM1300". I gues IDT is the OEM company and VMM1300 is the model of this particular box. Has anyone seen this issue before? Is this box supposed to be plug and play? I cannot find anyway to download/install drivers for it. I updated the Intel 4000 graphics card drivers via the Lenovo's "TVSU" system update tool, but nothing changed. I cannot get it identified as "IDT VMM1300" (hoping to get the 3360x1050 resolution option with that).
I tried the other display port ont he docking station, it did not help. The two Dell monitors are connected to the DP splitter via active single link DVI-DP adapter cables. These should be fine since they both work properly as single monitors when connected to the display ports on the docking station directly (via the same DVI-DP adapter cables).
I'm trying to get 3 external monitors to work with my T430/Intel 4000.
Thanks in advance.

I had the same issue with a Lenovo T440. I thought this was a prank that somebody had installed on the computer as the name that shows up is PnP "Montor". I was able to fix this with one of our staff. The only thing that fixed it was replacing the VGA cable.

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