HD4000/HP8470p Third Monitor

[lenny11]

I have that machine with an HP Advanced Docking Station. Everything else works great. I have 3 drives set up with OS X Sierra, Windows, and Linux. I can use three external monitors with Windows 10 and Ubuntu 16, works flawlessly. I also have a desktop Nvidia Hackintosh that can. The monitors are DELL U2410f DisplayPort(two monitors must be DP or Active Adapters for 3 screens to work). The machine is a rev 9 HD4000 with a 1600X900 panel.

 

However OS X struggles to detect the third monitor. It will activate the third monitor and put it right to sleep.

Docking station has

DVI.  DVI

DP.    DP

(using DP)

 

Notebook Has a DP out

 

VGA never used, No HDMI

 

I can use any combination of two screens, internal or external.

 

Here is my frame buffer for starters, 

Here is the original AppleCapriFrameBuffer:
09 00 66 01 01 03 03 03 00 00 00 04 . - 09/ 3 ports
00 00 00 01 00 00 00 60 10 07 00 00 -
10 07 00 00 00 00 00 00 00 00 00 00 -
00 00 00 00 50 29 04 00 00 00 00 00 -
01 00 00 00 02 00 00 00 30 00 00 00 - LVDS
02 05 00 00 00 04 00 00 07 01 00 00 - DVI
03 04 00 00 00 04 00 00 07 01 00 00 -DP

I edited it to this, but did not really get a change:
09 00 66 01 01 03 04 03 00 00 00 04  - 4th port
00 00 00 01 00 00 00 60 10 07 00 00
10 07 00 00 00 00 00 00 00 00 00 00
00 00 00 00 50 29 04 00 00 00 00 00
01 00 00 00 02 00 00 00 30 00 00 00
02 05 00 00 00 04 00 00 07 01 00 00
03 04 00 00 00 04 00 00 07 01 00 00
03 04 00 00 00 04 00 00 07 01 00 00  - Another dp?

Is there anything else to try? I saw some stuff for desktop, but I'm not sure if it applies to notebooks.

Thanks

[lenny11]

Yes, I confirmed 0x01660009 in clover.  That is definitely my chipset.