Big sur flikering with 4K monitor

Hello, I've success installed Big Sur on PC:

+ Motherboard: MSI X370 Gaming Plus

+ Graphic card: Nitro+ Sapphire RX 570 (8G)

+ Storage: Samsung Evo 960 SSD

+ Opencore version: 0.6.6

+ SMBIOS: iMacPro1,1

It's nice working and no problem if using FHD monitor (Dell 24inch FHD)

But with 4K Monitor (Dell 27 inch 4K) it's have an issue: Flickering when open launchpad or move anything window or youtube 4K full screen...

I have changed SMBIOS to iMac19,1/ iMac18,3/ iMacPro1,1/ iMac18,1 but it's still error.

After few time using, I think: The action related to the graphic flickers and then the screen goes black. (sometime auto restart).

How can I fix this problem?

submitted by /u/quyeticb
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