the cable/TV works with my HDMI 2.1 PC, but not with the MacBook.
What's more annoying is the macbook doesn't allow me to change the refresh rate so I have no chance to try HDR at reduced framerate either.

Update: A new expensive optical cable fixed the problem. But this cheap cable still works great for PC, so I blame the Mac UI for not allowing me to set the custom settings which a PC could.

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