Graphics problems on my install

Hi, I recently got started with OpenCore. I tried both Big Sur and Catalina but I have serious graphics flicker issues (wallpaper sneaks through windows). For example, when copying a folder icon to preview or doing graphical tasks like changing Terminal profile, the screen freezes and sometimes I am unable to continue using it.

My desktop configuration:

Intel i3-4160 3.6GHz quad core

Intel HD 4400 Graphics

Asus H81M-K motherboard

I am using precompiled DSDTs from the dortania guide.

I'm using WhateverGreen and Lilu with the instructions from the Dortania guide:

AAPL,ig-platform-id: 0300220D

framebuffer-patch-enable: 01000000

framebuffer-stolenmem: 00003001

framebuffer-fbmem: 00009000

device-id: 12040000

When I press 'About this Mac' I see the graphics card has 1.5GB memory

submitted by /u/Matanraf
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