[Request] Ivy Bridge on Lenovo T420/T520 and so forth QM67 Platforms

This has been something rather long running:
Enable IVB Cpu in t420 SNB laptop

But did anyone ever figure out how to implement full Ivy Bridge support on the Lenovo QM67 platforms using the original BIOS? Most of the resources I see on this keep saying that this was halted due to an issue with a conditional check for graphics selection.

I’m aware that Coreboot has this working, but I’m curious as to someone got it working with the original BIOS.

Anyone else ever look into this?