Thank you for contacting Plugable support! Sorry to hear about this issue. I’d be more than happy to assist you.
- For your Dell, have you installed the required DisplayLink drivers for the dock? This will be needed before the two DisplayPorts, Ethernet, and audio are able to function. Windows systems sometimes do this automatically via Windows Update, but for a corporate system that may not be happening and it may need to be done manually. You may also need to get IT approval / admin rights to manually install the drivers.
- The “HDMI 4K” port on the dock requires the computer to support USB-C DisplayPort Alternate Mode video output functionality (“DP Alt Mode” for short), this is optional per the USB-C spec and not all systems support it.
Looking at the specs for the Latitude 5400, it should be supported: “USB Type C™ 3.1 Gen 2 with Power Delivery & DisplayPort (Optional Thunderbolt™ 3)”
- The aforementioned HDMI 4K port will also require you to use the provided USB-C to USB-C cable. If using a third party C cable, it may not be able to properly support the dock as not all C cables are created equally. So be sure to use the same cable that’s already working with the Mac.
Please don’t hesitate to let us know of other questions.
Thanks again for contacting Plugable support and best wishes!
Senior Engineer | Product Owner