![]() I recommend starting by connecting the two external displays to the docking station, one to each “Display #” port pair ( for example connect the HP 24MH to “(1)HDMI” and connect the HP VG240A to “(2)HDMI” or “(2)DP++” on the back of the docking station ). Thank you for contacting Plugable, most likely the issue you are seeing is unrelated to this post due to the hardware difference between the UD-3900PDZ USB-C Triple Display Docking Station and the UD-6950H USB 3.0 Dual Display Docking Station. Please let me know if the above helps to get the external display detected and working, and if it is still not working please let me know the manufacturer name and model of the external display, and which port it is connected to on the docking station. We provide step-by-step installation and configuration instructions for the DisplayLink Manager App here ( ). ![]() The HDMI 2 and HDMI 3 “DisplayLink” output ports rely on the DisplayLink Manager App to enable and control these displays. This also requires connecting the docking station directly to a USB-C port on the host computer with the original USB-C cable provided with the docking station, Apple’s white USB-C charging cable does not support USB-C DisplayPort Alternate Mode video data. The Apple MacBook Air with M1 processor can support a single external display using USB-C DisplayPort Alternate Mode. The HDMI 1 “Alt Mode” output port relies on the host computer’s USB-C DisplayPort Alternate Mode functionality, this is an optional USB-C feature. ![]() The UD-3900PDZ USB-C Triple HDMI Docking Station relies on two Graphics Technologies to support up to three external displays. Thank you for contacting us, I am sorry this is not working as expected and I am happy to help!
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