VGA port working (partially) on macOS Catalina 10.15.3 with a Haswell desktop GPU (no adapter)

It's been known that there is indeed support for VGA in Coffe Lake and that support for prior iGPUs was deprecated as the VGA port was removed since Sierra. However, using port patches in Devices Properties (Open Core), I made the VGA port to work again with graphics acceleration.

But there's a catch, the port is glitchy. Once macOS displays the accounts, you can see the Enter Password box with the blur effect. But after some seconds, the whole display will turn to another color (depends on the background). I'm not sure why that happens.

I would suggest to learn what are Ports, Connectors, Indexes, Types, and BusIDs before continuing, otherwise, you would get lost.

These are the patches that are supposed to enable the VGA port according to the Whatevergreen Intel guide:

06020000 02000000 30000000 // Option 1

06020000 01000000 30000000 // Option 2

None of those ports seem to work. The first problem is that the Index is 6, which does not make any sense as the Azul framebuffer only supports up to 3 Indexes (software ports). So we first have to change the Index for the VGA port on your motherboard, which is 2 (physical port is (0x06)) for me.

So I'd patch the second port, which is 02040A00 00040000 87000000.

bus-id 4 is for DP so we would change that to 2, which is VGA. That is according to what Hackintool says. I also proved other bus-ids but none of the other ones seem to work.

I have no idea what pipe does so I just type zeros.

The next part is the connector-type, for which I used 02000000. I tried the VGA connector-types that Hackintool suggested but I noted some weird differences whereas 02000000 seems to work okay.

Finally, I don't know what flags do so I tried with 30000000 and 87000000. The only difference is that with 87000000 I'd gain more seconds before the whole screen turns to another color.

https://preview.redd.it/zkpplg3uasm41.png?width=536&format=png&auto=webp&s=159b44e77b0a1b48d41ce78f834adcae033232c8

https://reddit.com/link/fixh7i/video/6be2srczbsm41/player

macOS Catalina 10.15.3

Kexts: Whatevergreen 1.3.7

Boot loader: OpenCore 0.5.6

PC Specs:

Intel Core i5 4460

Intel HD Graphics 4600

ECS H81H3-M4

4GB RAM DDR3