Maybe I'm not the only one who wants to keep running on High Sierra (or Mojave) because of hundreds of 32bit Plugins and Apps not running on Catalina or Big Sur, but still take advantage of faster CPUs.
This post is ONLY about getting the iGPU up and running.
So I built this:
ASUS TUF GAMING Z490-PLUS (WI-FI)
i9 10850K with UHD 630 - DP and HDMI output | iGPU-Device ID: 0x9BC5
MacOSX High Sierra.
To install High Sierra, I used this EFI from github by vectorseven.
I installed Opencore and finetuned the config.plist with https://dortania.github.io/Ope…isites.html#prerequisites
Plattform is imac 18,3
WHAT WORKS:
Basically everything. System is stable, and works great.
Wifi, Bluetooth, Ethernet, ALCS1200 AUDIO on the Motherboard all work flawless.
DisplayPort (DP) and HDMI output works.
WHAT DOES NOT WORK:
No Audio on DP and HDMI, iGPU only 18MB VRAM, the 2 Display-Monitors run in Mirroring Mode, no possibility to get them in seperated Mode (MacOS only recognices ONE Display)
GOAL:
Patch the IGPU using Opencore Framebuffer Patching with Whatevergreen.
Getting rid of the 18MB VRAM
Setting up connectors for HDMI and DP
I tried numerous things, different device-IDs, Hackintool etc. but nothing seems to make a difference.
This is where I'm at: