UD-3900 (rev b2) does not show display if resoulution is greater than 1920x1080

Hey there.
I have a Dell Latitude 5480 running windows 10. When connecting my monitor (ASUS ROG PG278QR) via the docking station when i work from home, the display does go to the monitor when the resolution is greater than 1920x1080. I have tried 1920x1440, 2048x1152 and 2560x1440 resolutions. The 1920x1080 resolution is marked as recommended in Window’s Display Settings.
When I plug my monitor straight into my machine via HDMI, using the same HDMI, 2560x1440 is the recommended resolution and it runs just fine. So i don’t believe it is a cable to issue with the machine.
There is no other displays connected to the docking station, just the one HDMI to the monitor.

Any idea what this issue could be?

Hello and thanks for posting!

Thank you as well for the detail you provided and the testing your have performed that is much appreciated.

When only a single display is connected, our UD-3900 dock can support a single HDMI display up 2560x1440 resolution at a 50Hz refresh rate.

Looking at the manual for your monitor here → https://dlcdnets.asus.com/pub/ASUS/LCD%20Monitors/PG278QR/PG278QR_English_V1.pdf on electronic page 26 (printed page 3-8) it lists the supported resolutions and refresh rates via HDMI in a table.

This table (snippet attached below) indicates that the monitor does not support 2560x1440 at the lower 50Hz refresh rate our dock can provide (the monitor requires 60Hz). The monitor does not appear to support 1920x1440 or 2048x1152 resolutions at all, and the first available resolution within the capabilities of our dock is 1920x1080 at 60Hz. As a result, that is the only option available.

We do offer alternative docking stations that can support up to 4K UHD (3840x2160) resolution at 60Hz via DisplayPort, for example our UD-6950 docking station → https://plugable.com/products/ud-6950 A quick note, the maximum refresh rate supported by the UD-6950 or any of our other DisplayLink-based products is 60Hz. Higher refresh rates are not supported.

Thank you,

Plugable Technologies

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