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Most often it's a hardware limitation because the cables/adapters use the MCDP2900 converter chip inside, even when they advertise HDMI2.1 support. That's the same chip inside the built-in HDMI port of the new MacBook Pro and its datasheet [0] says it only supports up to 60hz
That chip is also the reason for a lot of support emails I'm getting on Lunar (https://lunar.fyi/) because it seems to break DDC/CI and hardware brightness control stops working through cables and ports that use it.
[0] https://media.digikey.com/pdf/Data%20Sheets/MegaChips%20PDFs...
There is a tool that makes Linux act as if it has Mac keybindings. https://github.com/rbreaves/kinto I've been using it, with some custom config, and it's made life a lot easier as I use a Mac and Linux laptop at the same time.