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https://pcper.com/2021/12/betterdummy-a-resolution-to-apple-m1-macs-dislike-of-external-monitors/
maybe this is answer seems to be called better display in App Store
user67680
I've just got an Iiyama G-Master GB3461WQSU 34" ultrawide monitor. I've connected it to my M1 MBP via a Dell WD15 dock
The monitor should have a display of 3440 x 1440 however I can only get it to recognise 2560 x 1440
Is this as issue with the doc or the HDMI between doc and monitor?
The dock and cable I was given by my old employer. The HDMI cable looks like a generic one so I'm not sure of the spec - it just says HD 4K UHD on it.