RehabMan
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0x191b0000
I'm not sure what it is set to. I haven't changed the DVMT-prealloc setting as it is not available in my BIOS.
You need to use an invalid ig-platform-id, then rebuild cache, then reboot with valid ig-platform-id.
Otherwise the 32mb DVMT-prealloc patch cannot apply.
Also, DMVT-prealloc 32mb may not be large enough for 4k (see FAQ for ways to change it).
And you must insure CoreDisplay is patched properly.
And then there is potential EDID issues.
You could also try other ig-platform-id values.
All must be in line before you should expect it to work, and even then you may have some unknown problem.