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AbSoluTc

macrumors 603
Original poster
Sep 21, 2008
5,266
4,206
I have an M1 MBA and a Dell P3421WM connected to a CalDigit TB4 dock. Display is connected to the dock via a TB3 cable and the dock is connected to the M1 via a TB3 cable as well. Both USBC.

I run the display at 3440x1140 - however whenever the display sleeps (time varies) and I wake it, a lot of the time it defaults to 1920x1080. I have to open the M1, disconnect the dock cable, wait, reconnect the cable and close the lid. Now the resolution is correct.

Why does it do this? I have tried new cables as well, even switching to TB4. Nada.
 
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