After upgrade to macOS 26, my UD-ULTCL does neither support ethernet nor HDMI 4k monitor any more. The lights for the ethernet cable show green and amber flashing. But the Plugable wired network component appears as disconnected in my system settings. Also the external monitor connected via HDMI is not recognized. The DisplayLink Manager software does not recognize any device as well on startup.
The dock has been working for many years with several MacBooks without any problems.
Hi Thomas,
Thank you for contacting Plugable! I’m sorry the UD-ULTCDL isn’t working as expected, and I’ll be happy to assist.
In your message, you mentioned a couple distinct issues that I’d like to address individually:
The HDMI monitor is not recognized in the DisplayLink Manager
I believe you alluded to this monitor being connected to the dock’s HDMI 4K port - this port uses DP Alt mode to produce video on the connected display rather than using DisplayLink, so monitors connected to this port aren’t expected to appear within the DisplayLink Manager. However, it’s still odd that the monitor isn’t working at all.
To verify, are you using the USB-C cable that was originally included in the package with the dock to connect it to your Mac? I ask because other cables may not support DP Alt mode, which would result in no video on the monitor connected to the HDMI 4K port.
The lights for the ethernet cable show green and amber flashing. But the Plugable wired network component appears as disconnected in my system settings.
This behaviour is a little harder to pin down. To start troubleshooting this, can you please follow the instructions in this knowledge base article? https://kb.plugable.com/question/1495581
The articles advises how to remove and re-add the dock’s network adapter within macOS, which can sometimes help to restore functionality.
In case these steps don’t fix the problems, can you please send an email to our direct support email address (support@plugable.com) with “For ticket # 480701” in the subject line? In the email, please include the following information:
The Amazon Order ID number for your docking station purchase
While the docking station, network cable, and displays are all connected to your PC (even if not working as expected), the output of our diagnostic utility PlugDebug: https://plugable.com/pages/plugdebug
This information will help us to determine the next steps.
** Please do not post the above information here in our public forum (it contains personally identifiable information) **
Apologies for the frustration, and thank you for giving us the chance to help!
Sam
Plugable Technologies
Hi Sam,
thanks for the quick answer. It was actually the cable. I replaced it with the one that came with the dock and now the problem is solved.
BIG THANKS.
Thomas
Glad to hear that fixed it! Feel free to reach out again if there’s anything else we can help with, and have a great day!
Sam
Plugable Technologies
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