Display LinkアダプタがmacOS 10.13.4では動作しない

Display LinkアダプタがmacOS 10.13.4では動作しなくなりました。

Important Information about macOS 10.13.4 update
http://www.displaylink.com/downloads/macos
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.

同様に、duet displayも動かくなっているようです。

*We recommend staying on macOS 10.13.3*
https://help.duetdisplay.com/faq/305404-macos-10-13-4-support
Installing macOS release Version 10.13.4 will cause Duet Display stop functioning after the OS upgrade. 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.

We would strongly recommend contacting Apple though their bug reporting (https://developer.apple.com/bug-reporting/). It will help have the bug prioritized if Apple is aware how many people are affected by this issue.

We are actively looking into workarounds so that duet is not affected by the macOS bug, and will keep you informed. Please e-mail us if you have any questions. Thank you for using duet.

この状況だと、macOS側の問題のように思えます。問題が見つかったのは4月の始めでまだ解決されていません。

DisplayLink with driver 4.1.11 doesn't work with the macOS High Sierra 10.13.4

Early of April 2018, I updated macOS on my Mac mini, then DisplayLink adapter that I used did not work...

I've checked DisplayLink web site and I've found this message:

Important Information about macOS 10.13.4 update
http://www.displaylink.com/downloads/macos
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.

And I've also found that another USB display adapter like duet display also 
does no work.

*We recommend staying on macOS 10.13.3*
https://help.duetdisplay.com/faq/305404-macos-10-13-4-support
Installing macOS release Version 10.13.4 will cause Duet Display stop functioning after the OS upgrade. 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.

We would strongly recommend contacting Apple though their bug reporting (https://developer.apple.com/bug-reporting/). It will help have the bug prioritized if Apple is aware how many people are affected by this issue.

We are actively looking into workarounds so that duet is not affected by the macOS bug, and will keep you informed. Please e-mail us if you have any questions. Thank you for using duet.

How bad situation...

How to create a bootable installer for macOS

I had to reinstall macOS to my mac mini, because I replaced HDD in my mac mini. I tried to reinstall macOS via the internet, but I could not, because of the limited bandwidth of my internet connection. Then I used the USB-installer.

The step of making USB-installer is described at the following WWW page.

How to create a bootable installer for macOS
https://support.apple.com/en-us/HT201372

The steps are the following:

1. Download macOS from the App Store. When the macOS installer opens, quit it without continuing installation.
2. Connect your Mac to the USB flash drive or other volume that will be used as the bootable installer. Make sure that it has at least 12GB of available storage.
3. Execute the following commands in Terminal(This example is for High Sierra).

   sudo /Applications/Install\ macOS\ High\ Sierra.app/Contents/Resources/createinstallmedia --volume /Volumes/MyVolume --applicationpath /Applications/Install\ macOS\ High\ Sierra.app

macOS の起動可能なインストーラを作成する

手元のmac miniのHDDを交換したので、再インストールが必要になりました。
このときに、USBメモリにmacOSの起動できるインストーラーを入れて、これからインストールを行いました。

このときのインストーラーの作成手順は以下のWWWページに記述がありました。

macOS の起動可能なインストーラを作成する方法
https://support.apple.com/ja-jp/HT201372

手順を以下に再掲します。

1. App Store から macOS をダウンロードし、インストーラーが起動したら終了させる
2. 16GB程度のUSBメモリをmacに接続する
3. ターミナルで 、以下のように、インストーラーに含まれるcreateinstallmedia コマンド実行する(例はHigh Sierraの場合)
   

   sudo /Applications/Install\ macOS\ High\ Sierra.app/Contents/Resources/createinstallmedia --volume /Volumes/MyVolume --applicationpath /Applications/Install\ macOS\ High\ Sierra.app