Any new about that?
I had a Intel 12th CPU (N100) and still stuck in C3. Try every Bios power and thermal combinations..
Just one time they enter in c6 State, for o little time
its a mini pc, all onboard.
00.1d.0 > Intel wi-fi bluetotth (no option to disalbe in BIOS)
02.00.0 > May a NVME card, but do not find any option in BIOS the change IT. May upgrade de firmware?