It's the GuC and HuC firmware.
replyThanks! Aha this is for gen 9ish onwards, my GPU is gen 3.
replyExactly -- not sure I have many machines new enough for this to apply to.
replyThe machine I'm typing on is the 2nd newest in the fleet -- it's a work box -- and it's an i7-8550U, an 8th gen "Kaby Lake" chip.