Deskmini 110 with 7th cpu: Catalina is working but no HEVC

Hi all.
I have made Catalina run on a Deskmini 110 build successfully, which is an ITX with ASRock H110M-STX motherboard and i5 7600T cpu. However, when I'm using the Intel framebuffer config following this guide, the system could boot but with random black out unless I change it to a 0x19120000 id of SkyLake spoofing, it helps but would make HEVC unsupported under VideoProc test.
This thread talks about the problem but I'm sure my DVMT prealloc in BIOS is 128MB.
I'm...

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Author: lightingmac