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Replied In 34" Display not recognises full resolution in Big Sur

The SwitchResX messes things even more. But switching to some 'noname' DisplayPort to usbC cable fix that issues.

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Replied In Wide Screen Monitor Resolution on MacBook Pro with Retina Display not working

Have similar issue with UWHQ 3440x1440p The solution was to switch from HDMI dongle to DisplayPort - usbC cable.