anyhoo, having trouble getting my WD19 dock to display 4K@60Hz. the laptop is a Dell Latitude 5290 2-in-1, it supports DP-Alt over USB-C (no Thunderbolt) and a direct connection from the laptop to the screen works. however, attaching the monitor to the dock via DP, and then connecting the dock to the laptop with its USB Type-C cable with PD yields 4k@30Hz max.

Dell has a bunch of newer WD19 models (TB, S, etc.) but I don't have those.

it is possible that my hardware is faulty as I've sourced it nth-hand, but before I start replacing it one-by-one, maybe someone got it to work? thanks.

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