Displaylink ceases to work in 10.13.4

[gabhain]

Originally Posted by wolfferine

Hi,

I found this rather interesting article, about Kernel Extensions:

Whitelisting third-party kernel extensions using profiles

Something DisplayLink could take a look at, or did they done already

That implies that they have a working system extension, which they dont. A beta driver on a beta OS that runs on some hardware doesnt really count after like 8 months. The article discusses whitelisting system extensions using Jamf, if it was a whitelisting issue then users would have a prompt to manually add the extension. Non enterprise users wouldnt have Jamf most likely. Ive had to whitelist extensions in jamf before, it would be awesome if that was the issue as its easily fixed but unfortunately its not

OWC, Caldigit and HP had this working on their docks with zero downtime for users so this is a Displaylink issue not an Apple one.

[paultzirides]

Originally Posted by gabhain

That implies that they have a working system extension, which they dont. A beta driver on a beta OS that runs on some hardware doesnt really count after like 8 months. The article discusses whitelisting system extensions using Jamf, if it was a whitelisting issue then users would have a prompt to manually add the extension. Non enterprise users wouldnt have Jamf most likely. Ive had to whitelist extensions in jamf before, it would be awesome if that was the issue as its easily fixed but unfortunately its not

OWC, Caldigit and HP had this working on their docks with zero downtime for users so this is a Displaylink issue not an Apple one.

Unfortunately, you're a little off on your assessment of OWC, Caldigit, and HP docks. Those all use Thunderbolt 3, not USB-C, despite the cable looking identical to USB-C. Those docks use either the "alt-mode" function of USB-C (which passes video data over the DisplayPort channel), or native Thunderbolt 3. Each of those are seen by the OS as a native display, and the other functions of those docks have work in a similar manner. That functionality is dictated by the hardware itself. DisplayLink does not use DisplayPort or Thunderbolt, it's a different set of hardware that pipes a number of disparate hardware functions over USB, and requires special drivers to be able to do that.

Thunderbolt docks are expensive to produce and are expensive to purchase. DisplayLink is a lower-cost alternative that most people find appealing because of that lower cost. Hopefully Apple is able to work with the DL team to help them get to where they need to go with this driver.

[gabhain]

Originally Posted by paultzirides

Unfortunately, you're a little off on your assessment of OWC, Caldigit, and HP docks. Those all use Thunderbolt 3, not USB-C, despite the cable looking identical to USB-C. Those docks use either the "alt-mode" function of USB-C (which passes video data over the DisplayPort channel), or native Thunderbolt 3. Each of those are seen by the OS as a native display, and the other functions of those docks have work in a similar manner. That functionality is dictated by the hardware itself. DisplayLink does not use DisplayPort or Thunderbolt, it's a different set of hardware that pipes a number of disparate hardware functions over USB, and requires special drivers to be able to do that.

Thunderbolt docks are expensive to produce and are expensive to purchase. DisplayLink is a lower-cost alternative that most people find appealing because of that lower cost. Hopefully Apple is able to work with the DL team to help them get to where they need to go with this driver.

Thanks for the explanation i guess but you may have misunderstood my comment. I am very well aware of the differences between tb3 and usb-c. The manufacturers i mention make usb-c docks as well as tb3 ones. im using a usb-c OWC dock as i type this and while its far for perfect it works.

[warlockuk]

Unfortunately, us peasants on the current non-beta OS with Thunderbolt 2 are SOL.
Single DisplayPort out from my Belkin dock works fine. ONE external monitor works at the wrong resolution kindasorta. The other monitor (which is rotated 90 degrees) is basically dead.

Yay. And this has been the situation for six months for anyone who didn't upgrade like me. I can't roll back as I need the latest Safari. Yay.



Yay.

[warlockuk]

PS Spellcheck the displaylink.com homepage. Connectivitye, eh?