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Valve: HDMI Forum Continues to Block HDMI 2.1 for Linux
(www.heise.de)
This is a most excellent place for technology news and articles.
Do you have adaptive sync on? If you do try turning it off for both monitors. That worked for me but your milage may vary.
Mint isn't wayland yet and X11 does not support adaptive sync if multiple monitors are connected
I don't even know what that is, frankly.
It's a generic term for Freesync/GSync, having a variable refresh rate.
Oh. No, my monitors should always be at 60Hz now. They're both DC powered (internal + USB).