I am trying to get three Dell U2713HM monitors to work with a GigaByte Z87MX-D3H but I am running into some issues:
1.) The monitor connected to the DisplayPort is recognised as a built-in display rather than an external monitor.
Edit: Toleda suggested to change AAPL,ig-platform-id to 0x0d220003 but it turns out that I am already using it so that cannot be it. I also noticed that the DisplayPort connector is on port 0 which may be wrong.
Edit-2: Yup. I patched AppleIntelFramebufferAzul.kext and now it is using port 7, instead of port 0, and as a result the monitor is no longer recognised as a built-in display. I guess that settles it.
2.) The used image for the monitor is wrong.
Edit-2: Also solved by the AppleIntelFramebufferAzul.kext patch.
3.) The monitor connected to the HDMI port has a maximum resolution of 1920 x 1080 and requires EDID* edits.
Has anyone ever solved this built-in / image problem before?
2.) Has anyone a working HDMI EDID* edit or know how to do this?
Mirroring enabled 2560 x 1440 on two of the three monitors, connected to DisplayPort and DVI connecter, but that is clearly not what I want. I need full control over the displays. However. This seems like a step closer to a real solution. This also counters something that ‘bcc9’ said. That this motherboard does not support dual-link DVI. Well. Mine certainly does.
*EDID is short of Extended Display Identification Data
I had some issues to get my Gigabyte GA-Z87MX-D3H motherboard to boot with a Displayport 1.2 cable plugged-in, but covering pin-20 (lower right corner) with a small piece of tape solved this problem.