Ok, nice. That's where it was.
It's weird. My TV, an LG C9 has a 10 bit screen, but there's no 10 bit option ?? The only option is 8 bpc. I've tried changing other settings to see if it was contingent on some other setting, but no matter what I set everything to the only option is always 8 bpc Does that mean the cable doesn't have enough bandwidth?
Also, is 4:4:4 preferred for PC/gaming stuff, whereas 4:2:0 is better for movies/tv?