TIL: HDMI is actually quite a closed system and the HDMI Forum has successfully blocked AMD from supporting 120Hz @ 4K in their Open Source drivers because they disallow Open Source implementations of (that part of) the standard.
I see a lot of people talk about "just use DisplayPort" because it is supposedly more open, but I can't find much about that when searching the web. Does anyone here know more about that? Got some good sources? Should I ensure all new stuff I buy has DisplayPort?