Display Link Dock / Hub does not work after upgrading to OS 15.3

I had the same, on an M3 Macbook Air on a Dell D6000 hub.

I also found that the Screen Sharing options in System Settings were greyed out (not sure if they weren't before).

However, I downloaded the latest version of the Displaylink software from the Synaptics Website, 1.11.0 b28, quit the app, installed it, and opened the app again - and my Dell monitor was detected and worked OK. No need to plug the hub into a PC, reboot the MBA, or even log out.

It seems that the dock will be locked after the update. After I connected a passive dock, I was asked whether the accessory should be allowed.

After confirming, the Thunderbolt 4 dock (ICY Box) works again without any problems.

duthmanguelph wrote:

Otherwise, if Apple Tech is listening, there must be a fix for Mac users using Display Link devices.

This is a user-to-user forum. Apple largely is not here, except to moderate it – and if they were here, I believe they would point you to the company who sold you the DisplayLink-based device, and/or Synaptics, for support.

I also shopped around for docks at Apple, and there are no Docks that support 2 x HDMI cables or more!

I haven't checked what Apple carries, but there are several Thunderbolt docks and hubs that will let you connect a couple of non-Thunderbolt displays or adapters, with resolutions of up to 4K @ 60 Hz, to a Mac that has hardware support for two or more external USB-C or Thunderbolt displays.

You might need adapters (e.g., if a Thunderbolt dock provided one HDMI output, and could provide a USB-C(DP) signal, you could pair it with a USB-C to HDMI adapter or adapter cable for the second display).

The key is that to attach two monitors to one Mac host port,

• The Mac must support attaching multiple displays via USB-C or Thunderbolt.
• The device attached directly to the Mac must be a Thunderbolt device (e.g., Thunderbolt dock or hub), even if it then splits up the signal for the benefit of ordinary non-Thunderbolt displays.