Hi william57m,Hello wildwillow,
It seems not working for me.
I'm on macOS Sierra 10.12.3
My current monitor is connected via DP and is on port 0x5, the connector type is good too <00 04 00 00>
I added the 4th display patch and the DSDT patch then ran the App v1.3 but if I replug my monitor it stays black and sometime the computer reboot.
This is a something I haven't worked out yet. Since I have DP and HDMI connectors I have to boot with DP and hotplug my HDMI display. I've tested different hotplug values with no success. Well you now have working dual monitors, you can make your change your primary over in System Preferences - Displays. If you need to there is information in Post#1Ok it works when I boot on HDMI then plug the DP, I now have the 2 display, but it doesn't work in the other way. When I boot on DP then plug HDMI it doesn't work.
No need now thanks, since you said you were getting a black screen I wanted to check that it wasn't because of AGDP. You have working monitors and I can see in the screen shots of IOReg.And the registry (I can send you the file by private message if necessary)