<< Solved >> Black screen after Catalina 10.15.5 update (multi-GPU)

[cehem]

Hello,

First, I apologize for my rough English.

I designed a hackintosh with 4 screens a while ago, using the integrated GPU (intel UHD 630) and an external GPU (Nvidia Geforce GTX 660) simultaneously on an ASUS PRIME Z390-A motherboard.
At the start with Catalina 10.15.0, no problem. I did the updates to 10.15.1, 10.15.2, 10.15.3 and 10.15.4 without difficulty.
Confident, I therefore proceeded to update 10.15.5 ... And there, everything works, EXCEPT, my integrated GPU.

To be precise, I have 1 screen on the integrated GPU and 3 on the external GPU. Previously, at startup, I had the apple logo on the "integrated" screen then during the loading it passed on an "external" screen, then returned on the integrated screen then MAC OS started.
Now I have the apple logo at the start on the "integrated" screen, then it goes to an "external" screen, and the "integrated" screen goes out ... definitively. Mac OS starts on the 3 "external" screens.

I tried as seen elsewhere, to change the value of "AAPL,ig-platform-id" from 07009B3E to 00009B3E, which had the effect of no longer operating any screen.

I am attaching my config.plist so you can see if something is wrong with it ... Thanks for your help!

 

[Namok88]

Make sure your Primary GPU is set to PCIe in your BIOS

 

[cehem]

Effectively my main screen was on "CPU" which corresponds to the desired operation.
By passing it on "PCIe", the result is exactly the same, the 3 screens connected to the graphics card in PCIe work, but not the one connected to the motherboard. The difference is that the apple logo is no longer displayed on the screen plugged into the motherboard ... the 3 bios configurations that I attach give the same result in the end: 3 screens out of 4
I also put pictures of the start of the computer :


with the same configuration of bios under catalina 10.15.4, I had this........

 

[Namok88]

Please post screenshots of Hackintool >> Patch and Displays

 

[cehem]

Thank you !
I hope these screens give you the right information
In terms of connectors, I normally have 2 DP and 1 DVI on the GTX 660 and 1 HDMI on the internal card...

 

[Namok88]

Do you see a fourth display in Hackintool "Displays" tab when you scroll the list?

 

[cehem]

No, it misses a PLE2483H, surely the one connected in HDMI on the motherboard ... there should be 2

 

[Namok88]

Have you checked this guide?

[GUIDE] General Framebuffer Patching Guide (HDMI Black Screen Problem)

General Framebuffer Patching Guide using Hackintool Please do not quote this guide in its entirety. Post a link instead. 15 Jan 2019: Intel FB-Patcher has been renamed to Hackintool. 19 Jan 2019: Guide overhauled. Please be aware of possible HDMI hot-plug issues. After boot you may have to...

www.tonymacx86.com

 

[cehem]

Absolutely not. I look at that and come back to you if that doesn't solve the problem

 

[cehem]

OK,
so it's totally impossible to follow the guide, since hackintool is not compatible with catalina. I never get the "red line" in the list of connectors, worse, for some reason that I don't know, as soon as I try to see the list of connectors, the application crashes and closes ....
Luckily, hackintool knows my motherboard (Asus prime z390-A) so I tried to force fate a bit by going through it. It did make configuration changes, but without any results ...
I fear that I will only have to format everything and start all over again with 10.15.4, and especially not to go under catalina 10.15.5
Another thing, using the startup argument "agdpmod=pikera", a few seconds after the opening of the session, the 4th screen lights up, but the image is all pink :/