Attention: the recent macOS High Sierra update to version 10.13.4 will break the DisplaLink driver version 4.1 and cause any connected displays to go blank after the OS upgrade!
From DisplayLink’s website: http://www.displaylink.com/downloads/macos
Important Information about macOS 10.13.4 update
We have become aware that installing macOS release Version 10.13.4 will cause DisplayLink connected displays to go blank after the OS upgrade, with the current DisplayLink driver [4.1] installed. Functionality such as Ethernet and audio, where implemented, is unaffected. We have alerted Apple to this issue and are working hard to find a resolution. These features continue to work as expected in 10.13.3.In the meantime, we have a new driver [4.3] that will enable clone mode, but not mirror or extended mode displays in 10.13.4. If you require mirror or extended mode displays, we recommend that you stay on macOS 10.13.3 or earlier at this time.
There is a patch available to update DisplayLink driver to version 4.3 – but this comes with the downside to allow only clone mode, but not mirror or extended mode displays (which is, actually, the more important features).
If you rely on a DisplayLink connected USB graphic card, you should NOT update to macOS High Sierra 10.13.4 – and stay on 10.13.3 or earlier until Apple fixes the issue.
