I am not lazy so I read several articles on the forum for this problem, but after 14 days I am desperate.I will donate or pay someone for his time if someone could help me.I can install Mojave 10.4.2 or HS 10.3.6 with one monitor setup but I am not able to connect a second one.My Vega has 2xDP and 2xHDMI. As my monitors are 2560x1600 I want to use DPorts, but only the first DP works.If I connect the second monitor, I am getting a black screen just before the login screen.On the same hardware I am able to run dual monitors with NVIDIA Titan Black on Sierra.But I want to switch to Vega because of no NVIDIA support for the future.What I've already tried:- clean install of MacOS Mojave/HS- I am using SMBIOS iMac 14,2, because newer iMacs SMBIOSes don't work for me- I've tried also SMBIOS MacPro 6,1 because some users reported success with dual monitors- I've tried WhatEverGreen and Vegagraphicsfixup.kext in /L/E- and I've tried several patches what I've found on the forums...I don't know if WhatEverGreen needs some keys or framebuffers etc., I don't have integrated Intel Graphics at all.One last thing: I have a DSDT.aml for my mainboard from one user. I did not make it alone because it is about my knowledge.I used it for 3 years (in 10.11 and 10.12) because I my USB ports doesn't work without it.I don't know if this has an influence on the Vega graphics too???Please, please, if someone can help me... thank you.
ASUS P9X79WS, Intel i7 4930K 6 core Ivy Bridge-E, Sapphire RX Vega 64 Nitro+ 8GB HBM2