[NAME]  The WD19 can only run a 4K 60 Hz display when paired with a system that supports DisplayPort HBR3 over USB-C. (If you use HDMI on the dock, the dock converts the DP signal from the system to HDMI.) The Latitude 5591 only supports DisplayPort HBR2 over USB-C, because Intel GPUs didn’t gain HBR3 support until certain Core 10th Gen CPUs and all Core 11th Gen CPUs, and your system uses Core 8th Gen CPUs. DisplayPort HBR2 doesn’t provide as much bandwidth. With a DisplayPort HBR2 system, the WD19 can only support 2560x1440 60 Hz or 4K 30 Hz for a single display.In terms of why you can get 4K 60 Hz when connecting directly to your display, it sounds like display’s built-in dock is configuring the USB-C link to support video and only USB 2.0 data speeds. The WD19 configures the USB-C link to support video and USB 3.x data speeds. Carrying the latter requires cutting video bandwidth in half. I wrote an explainer post on the various operating modes of USB-C, including their impact on possible display setups, over here if you’re curious.
Hello, I'm trying to figure out why I'm not able to output 4k[NAME] on my Dell Latitude 5591 laptop via a Dell docking station WD19. I mention that I tried using hdmi and DisplayPort cables towards my monitor. I'm not sure whether it's a problem of cables or my graphic's chip doesn't support 4k[NAME]. I also mention that I am able to get 4k[NAME] via my monitor's built-in usb-c dock.   Thank you!
Not able to output 4k@60hz - Dell Latitude 5591 via Dell docking station WD19