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Big Sur - Black Screen with Dual Monitor on R9 390

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I have been using my hackintosh for a while without any problems, until my monitor is replaced with a new one... Previously I was using 2 monitors connected via HDMI + DVI, now - with new one, I am using HDMI + DP, and my hackintosh stopped working. On every boot, everything I see is black screen... When I connect only one monitor (via HDMI or DP) - everything works fine.

I have tried many things: 
- CSM off / on 
- PEG + iGPU (64MB/128MB) / only PEG 
- SSDT patching / DeviceProperties patch 
- VBIOS reflash 
- BIOS reflash 
- Changing cables 
- Resetting NVRAM
- Changing SMBIOS
Nothing helps…
Fun fact - for 2 days everything was ok, the black screen problem appeared suddenly... So I am writing this post, maybe someone more knowledgeable will be able to help me :P

- Intel Core i5 4690k 3,5GHz (overclocked to 4,4GHz) 
- MSI Z97 Gaming 3 
- MSI Radeon R9 390 8GB 
- Kingston 16GB DDR3

- macOS Big Sur 
- Dual boot with Windows 10

- Acer VG272U 2560x1440@170Hz (connected via DP 1.4)
- LG 23MP48 1920x1080@60 (connected via HDMI 2.0)

- OpenCore 0.6.3 
- iMac15,1 
Full EFIhttps://drive.google.com/file/d/1eul7SnOEunfJOxBGD3Ygcmkc9f80DrlN/view?usp=sharing

- UEFI Boot Mode 
- CFG Lock and VT-D are disabled 
- iGPU is disabled right now, but it doesn't make any difference somehow in this situation. iGPU is HD4600

More Info: 
- I have SSDT patch in my ACPI folder, which works fine - R9 390 works pretty fast, but I have never edited AMD8000Controller - is it required? 
- I also have all needed kexts (AppleALC, AetherosE2200Ethernet, Lilu, VirtualSMC, WhateverGreen) 
- if I made linguistic mistakes somewhere - forgive me, I don't use English every day :P

On 11/20/2020 at 6:19 PM, HenryV said:

Read what Apple has to say, there are many potential incompatibility issues:




I don't think there are any compatibility issues. Before, both monitors were working, after about 2 days they stopped working. Maybe it's a problem with the Radeon drivers installed under Windows?

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