After update from 10.15.3 to 10.15.4 external displays doesn't work via docking station

Resetting the SMC and NVRAM, with the dock/cable unplugged from the MBP, worked for me

Fixed the problem! Thank you guys. For me was enough simply to hold 10s the power button.

Thank you!!!

It works for me too.

Update the firmware of my D6000

Posted the steps I got it fixed. But it’s still glitchy.

Key is

a) SMC reset

b) Power-cycle all devices.

c) Approve devices or drivers to be connect with MacOS at Security & Privacy Settings.

reinstalling/updating the DisplayLink drive and manager app solved this issue on my mac

https://www.displaylink.com/downloads/macos

Just updated as well and my external display via USB-C to Displayport isn't working when I connect it to the 2nd USB-C port on my 2019 13" MacBook Pro. Only works when I connect it to the first USB-C port. I'm on the back MacBook Pro with two ports.

Update: I tried resetting the SMC and it has fixed the issue, both ports work again for the external monitor.

Stumbled on a fix. Two thunderbolt interfaces on the MacBook Pro, one for power, the other for data. I swapped the power cable to the other thunderbolt port and the system healed! Shut down MBP, swapped the ports beach to how they were and Presto - it works again.

Apple just released a supplemental update for 10.15.4, to include “resolves issues where a usb-c port in your Mac may become unresponsive”. Just wondering if anyone had tried this. My dock is working okay when I reverse the two usb-c ports, it looks very strange but at least working okay for the past few days. Kind of hesitate to try any new update......don’t want any surprise

Okay so I just switched to this found on Amazon -

USB C Hub, USB C Docking Station, QGeeM 12 in 1 Triple Display Type C Hub to Dual 4K HDMI & DP,USB C to USB Adapter,100W PD, Gigabit Ethernet, USB C Card Reader,USB Docking Station

It's money spent, but works perfectly and much smaller than the old D7000 I was using, plus portable.

Hope this helps anyone open to the idea of purchasing a new dock.

Hi All,

I ended up reverting to a time machine backup with v. 10.15.1 and now it's working as it was.

I spoke to Apple support for hours with no luck who then created a ticket for their engineering team. By the time they called back 24hrs later to try some more things I had reverted back as i need this for work. He also mentioned that "they have not had many reports about this, so they need to troubleshoot"... Seems faily well known on the forums, but if you have the time and no backup it might be worth contacting them.

Note: I also spoke to Alogic who basically said it was on Apple's side, however, mentioned that updating the DisplayLink drivers was a workaround for some of their products (not mine as it doesn't require any drivers). Hope this is able to shed some light for someone.

I was having this issue this morning, I called apple support and they instructed that I do a SMC (system management chip) reset. everything works fine now, I hope you get this issue resolved.

Look for firmware updates from the manufacturer.

Installing the latest DisplayLink Beta Driver version 0.5 released on 3/16/2020, and set DisplayLink Manager "Launch on startup" solve t

All solutions up-to-this point are

• reset PRAM
• reset SMC
• Buy new Thunderbolt to monitor connectors
• Install new driver or re-install old drivers (if any, none on my MBP)
• or revert back to 10.15.3 (that's what I had to do).

I read that Apple changed the display system, so eGPU's now work as they should, looks like that fix introduced a bug. Lets wait and see: Apple probably knows about this bug, so now we have to wait.