Only one monitor being recognized

Thunderbolt TBT4-UD5
1

one one monitor is getting recognized. USB-c port is working but the HDMI ports with the HDMI to USB-c cable is not being recognized

2

in order to get both monitors to function, i had to plug an external power supply via USB-c port in the monitor that had the HDMI to USB-c with DP. the second screen is USB-c to USB-c - no issue with this connection.

3

Hello Dave,

Thank you for reaching out on the forums! I am sorry to hear that you are running into issues with your TBT4-UD5, but I would be happy to help diagnose the issue here.

From your description, it sounds like you are attempting to go from HDMI on the dock to USB-C on the monitor. Is my assumption here correct?

If so, then this is unfortunately not possible, as you are not able to convert the HDMI signal to USB-C. It only works the other way around (USB-C source → HDMI display).

If your other monitor only supports USB-C input, then I am afraid that our TBT4-UD5 is likely not the best option for your setup. I would instead recommend our TBT4-UDX1 dock instead:

https://plugable.com/products/tbt4-udx1

Thank you,

Evan

Plugable Technologies

www.plugable.com/support

4

Same issue, but different setup. I have a Windows 11 Laptop and I’m simply trying to run 2 external displays both via the HDMI ports on the TBT4-UD5 to HDMI inputs on the Displays.

Only one Display works, if I disconnect HDMI 1, the HDMI 2 Display then works, reconnect HDMI 1, still only HDMI 2 works, disconnect HDMI 2 and HDMI 1 works again. Should be an easy plug and play. I have the latest DisplayLink drivers.

Any suggestions?

5

Hello Travis,

Off the problem behavior alone, this likely sounds like a compatibility issue here given that only one display will work at a time. This is usually indicative of the host not support Thunderbolt 4 on the USB-C port. If the port supports Thunderbolt 3 or just DisplayPort Alt Mode, it will not be able to support 2x displays on our TBT4-UD5.

Additionally, the TBT4-UD5 is not a DisplayLink dock, so it will not work with the DisplayLink drivers you mentioned.

Thank you,

Evan

Plugable Technologies

6

Thanks for your reply.

You are correct. My wife plugged in her two work laptops running windows and her MacBook and all 3 laptops worked like a charm. Now you just need to design a switch product. :wink:

Just checking my detailed specs, you are spot on. Despite my laptop being pretty new it doesn’t have thunderbolt 4! It’s just a USB-C PD. You’re good. :slight_smile: So no problem at all with your product. Since this setup was for my wife we’re all good.

Thanks again for your reply.