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Doesn't work. If you read the very top of that page, it says that the page applies up through 10.13.3, and there's a link to info about 10.13.4 that basically says, "It doesn't work in any mode that's actually useful. Don't upgrade."

Looks to me like you don't have the right driver, or the driver hasn't been accepted by the user's system for sign-off reasons. Try this URL if you're talking about DisplayLink.

DisplayLink Support page

Slashdot has had some doozies lately. The one about Apple killing âoeDisplayLinkâ was fairly galling. https://m.slashdot.org/story/3... No mention that âoeDisplayLinkâ has nothing to do with âoeDisplayPortâ and basically hasnâ(TM)t worked on MacOS in the last 5 years. DisplayLinkâs hardware has similar Linux support(e.g. support seems to have stopped). Window still has some issues, but is fairly usable. https://support.displaylink.co... https://support.displaylink.co...

Slashdot has had some doozies lately. The one about Apple killing âoeDisplayLinkâ was fairly galling. https://m.slashdot.org/story/3... No mention that âoeDisplayLinkâ has nothing to do with âoeDisplayPortâ and basically hasnâ(TM)t worked on MacOS in the last 5 years. DisplayLinkâs hardware has similar Linux support(e.g. support seems to have stopped). Window still has some issues, but is fairly usable. https://support.displaylink.co... https://support.displaylink.co...

It may SEEM like a minor Update; but it rolled-out eGPU support for macOS; so OBVIOUSLY there were some fairly "deep" changes to the whole Display Framework; so, breaking a couple of THIRD PARTY display products is pretty much a foreseeable thing.

According to the version number, it IS a minor update. That's why we call that digit the MINOR VERSION.

The fact that Apple (probably unwisely) ignored their versioning policies and chose to roll out a major kernel-level feature in a software update doesn't change the fact that this is a software update, not a version upgrade, and software updates normally do NOT break things — particularly drivers. The whole reason Apple users are so willing to blindly install every software update, but drag their heels on major version upgrades, is that the former are expected not to break things, and the latter often do. When things like this happen, it undermines the perception of Apple as a quality software vendor, and runs the risk of leaving users vulnerable to serious security flaws because they feared installing some minor update that would have fixed it.

On the flip side, I looked into DisplayLink-based hardware a few years ago, and the sheer number of complaints about the drivers being badly broken left me so disgusted that I didn't go down that path. And they still haven't fixed those problems after what, four years?

So when I heard that it broke completely in a software update, my response was "must be Tuesday." Then, I realized it was Wednesday, and I was slightly alarmed, but only slightly, and only because today feels like Tuesday for some reason.

Actually, Apple had already announced that eGPU support was "Coming Soon" when they released High Sierra. So this is simply Apple doing a little ":catch-up" Development, rather than roling-out an entirely-new Platform Feature, such as say, AirPlay.

And you WILL notice that only TWO Display Vendors were affected, and one (Duet), was already on top of the situation, telling their Customers to wait on the Upgrade until Duet and Apple work things out. The difference being, the Duet Devs. are REASONABLE, and actually DID *THEIR* Due-Diligence, unlike the slack-jawed semi-sentient beings at DisplayLink, who probably actually contract-out their Display Drivers to some barefooted adolescent in a country without even reliable AC power.

As you yourself pointed-out, DisplayLink has a long and storied history of having their drivers/hacks break anytime someone so much as BREATHES on a Framework; so I REALLY fail to see how Apple is the bad-guy here.

Oh wait. Yes I do: It's because... Apple.

It may SEEM like a minor Update; but it rolled-out eGPU support for macOS; so OBVIOUSLY there were some fairly "deep" changes to the whole Display Framework; so, breaking a couple of THIRD PARTY display products is pretty much a foreseeable thing.

According to the version number, it IS a minor update. That's why we call that digit the MINOR VERSION.

The fact that Apple (probably unwisely) ignored their versioning policies and chose to roll out a major kernel-level feature in a software update doesn't change the fact that this is a software update, not a version upgrade, and software updates normally do NOT break things — particularly drivers. The whole reason Apple users are so willing to blindly install every software update, but drag their heels on major version upgrades, is that the former are expected not to break things, and the latter often do. When things like this happen, it undermines the perception of Apple as a quality software vendor, and runs the risk of leaving users vulnerable to serious security flaws because they feared installing some minor update that would have fixed it.

On the flip side, I looked into DisplayLink-based hardware a few years ago, and the sheer number of complaints about the drivers being badly broken left me so disgusted that I didn't go down that path. And they still haven't fixed those problems after what, four years?

So when I heard that it broke completely in a software update, my response was "must be Tuesday." Then, I realized it was Wednesday, and I was slightly alarmed, but only slightly, and only because today feels like Tuesday for some reason.

The truth of the matter is, DisplayLink driver support for OS X has always been rather shoddy.

I purchased a $100 or so docking station a while back, from "j5create" (who makes a lot of products that specifically claim Mac compatibility). They rely on rebranded/customized DisplayLink drivers to make their video ports on their docks work. When I installed the latest Mac drivers from them for it, I found out that screen rotation wasn't supported -- so I couldn't use my second display that was rotated to "portrait" mode.

I think they *finally* addressed that issue, but I already sold that MacBook and stopped using that dock with it, so I'm not 100% sure?

They had plenty of other issues though, even with the last couple major OS X versions:

https://support.displaylink.co...

Protected video content will never be viewable via a DisplayLink connected monitor either, BTW.

It's really just a partial solution/hack to add a monitor over a port that wasn't originally intended to be used that way. So while it's irritating it's non-functional in the latest OS X release? It was never that great to begin with.....

OOPS...I just noticed it refers to DisplayLink not DisplayPort. I guess the morning coffee hasn't quite kicked in. But the underlying sentiment is the same. It still uses a DisplayLink adapter and software to send VGA, DVI, or HDMI signals to any monitor you connect it to. But it places more stress on the CPU as the drivers do more of the heavy lifting. They acknowledge issues with the software on Mac OS X. Perhaps Apple just got tired of messing with them,

DisplayLink is a 3rd party "Video over USB" company. Trying to find out more about them I question their tech more than Apple.

https://www.displaylink.com/ Doesn't resolve.

https://displaylink.com/ SSL broken.

DisplayLink is a 3rd party "Video over USB" company. Trying to find out more about them I question their tech more than Apple.

https://www.displaylink.com/ Doesn't resolve.

https://displaylink.com/ SSL broken.

Replying to both of your posts:

The brokenness of multi-display support in the last two releases of macOS her her biggest issue. It's a battle to get her late 2015 5k iMac to wake her 2nd display after the machine sleeps, which has only been an (widely [stackexchange.com] reported, mind [avid.com] you [luminous-landscape.com]) issue [macrumors.com] since [reddit.com] Sierra [cnet.com]. It's not the Mac, either; nor is it the display. Every Mac we have with Sierra or newer (2 personal laptops, 1 business laptop and the iMac) exhibits this issue when this, or any other display is connected. These are Macs and displays which worked together just fine prior to Sierra.

...and...

Here you go, directly from her:

My itemized list of other “barely works” issues:

- if the Bluetooth keyboard disconnects itself while the computer is asleep, you can’t log back in unless you have a usb keyboard to type your password. Plugging the keyboard in with the lightning cable does not reconnect it (specifically, Apple's own keyboard exhibits this issue)

- non-Apple Bluetooth keyboards and mice won’t always connect until you log in after restarting, which is a problem when you can’t log in without a keyboard (this happens intermittently but often enough to make me go back to apples god awful carpal tunnel inducing keyboard)

- I have to have WiFi turned on for air drop and unlocking with my apple watch to work (even though the Mac is connected via ethernet to the same LAN as the other devices)

- none of the USB ports put out enough power to charge my iPad (this might be a problem specific to my iMac, I haven’t tried it anywhere else)

- the charge port for the mouse is in the bottom so you can’t use it while it’s charging

I’m sure there’s more that I can’t think of right now

Ok, let's address the multiple Displays issue:

I will agree that that is ridiculous. Macs have had multiple display support since at least 1985, LONG before Windows supported multiple monitors. I run Mavericks, and so haven't experienced this "wonderful new feature"...

After Googling a bit (which I assume you and/or your wife have already done), I came up with three general fixes:

1. Try to force your Monitor to be set to the Input you are actually using (i.e. HDMI) on the Monitor itself, rather than allowing the Monitor to do AutoDetect.

2. Download this new Driver:

http://www.displaylink.com/dow...

Note the Smile of Success from many Users:

https://discussions.apple.com/...

3. Use the Apple USB-C "AV" Adapter.

As for the Bluetooth Issues, I don't know for sure; but I would try trashing your Bluetooth Prefs and Re-Pair the BT Keyboard. If that doesn't work, then I'd trash the SMC Prefs. and see what happens...

As for the USB Power output issue: That is likely working as intended. Apple gave you a nice power adapter for your iPad. Use it.

AirDrop and Unlocking: Again, working as intended. The idea is to insure that your Mac and IPhone/iPad are in close proximity. IIRC, those Services use a Peer-Peer WiFi connection, likely on a different subnet than your LAN. That is on purpose.

Charging Port on bottom of Mouse. Lazy design. I'm not even going to try and justify that one!

Hope this helps!

As far as I'm concerned, a hardware router...

There is no such thing. A device that moves data from one location to another, using some policies to examine and transform it, is not just a "hardware" device.

That's completely immaterial. A hardware router is distinguished from a software router by whether it is or is not a general-purpose computer. Hardware routers range from that little D-Link all the way up to Cisco boxes. In the most extreme designs, the hardware provides a dedicated I/O processor that performs the actual routing functions, allowing it to route data considerably faster than a general-purpose computer can.

A hardware router is distinguished from a software router by the fact that a software router is capable of executing general-purpose instructions. In theory, you can make a hardware router that is only ever able to execute routing functions, and I think many routers do have portions of TCP/IP hard-wired into the silicon, but I'm not aware of routers where that's the only thing they do. In practice, the highest-level hardware routing that I know is the MAC caching in unmanaged switches.

Home routers are especially bad. Only a few of them use hardware for the routing, and all of them have general-purpose processor cores. The 802.11n router that I got for $50 this year has 128MB of RAM, 32MB of storage, and a 680MHz MIPS 24K processor. Except for the storage and floating point, that's far more computing power than I had in my desktop 15 years ago. I could install X Window libraries and run graphical programs from my router. If I wanted to, I could even attach USB storage and display adapter, and use it as my desktop.

The USB3 solutions may be the answer eventually, but the best chipset appears to be the Displaylink 3900 which is currently Windows only (not even Mac). Even then they are still based on compression/decompression. Maybe Optical Thunderbolt will happen one day and really solve the problem by taking extending the PCI Express bus across many meters.

Until then I'll just have to stick with my two fanless Geforce 210 cards... one in a hacked PCI-express X2 slot.

I would go crazy trying to develop on only one monitor. In fact, I could use a third, but it's not worth getting a new video card for it.

You should look at getting/requesting a displaylink device (I got an EVGA UV-Plus+). Newer devices will drive 1080p and higher resolutions, with very usable lag, all over a USB2 hub (I have mine servicing kb, mouse, iphone sync and the monitor with no hiccups ever).

Combined with a 24" monitor, that would only cost you or your organization $300. Chump change for the potential benefits.

The cost of buying a second monitor for one developer is immaterial. The cost of buying second monitors for every developer isn't.

Really?
Lets put things into perspective here. $200 for a decent 2nd monitor (we're not talking IPS Cinema displays here) compared to:

• 1% bonus (avg 80k salary = $800)
• Any decent proprietary software license 1 seat (avg. $300)
• 5 hours of productivity (at 80k salary = $200)
• ...etc.

The dual-monitor solution of days yore has been solved with stuff like DisplayLink or Thunderbolt (or by good gfx cards if your desktops are beefy enough).

I even have a 3-monitor solution for my home setup - A macbook pro, with 1 displayport 32" HTDV + 2 extra monitors running on the 2 separate USB2 channels (one is on a hub). Combine this with a mounting solution like this and you've can easily get 2 browsers and dozens of terminal windows all open simultaneously. You could easily setup a dual-display rig for $300 in addition to an existing monitor.

Maybe look at these video's ?:
http://www.displaylink.com/how_it_works.html

Is it any more then a small display gimmick ?

I mean, feeding my monitor/tv through USB would be nice, but there must be some technical glitch like lack of bandwidth for higher resolutions and frame rates.

Of course it's not enough bandwidth for streaming video, but it's more than adequate for browsing the web (sans YouTube) or (gasp) working on an extra (up to 1600x1200) monitor...

More info can be found here.

np: Casiotone For The Painfully Alone - Streets Of Philedelphia (Advance Base Battery Life)