Various vendors also warned customers to steer clear of 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,” DisplayLink’s Wim added. In macOS, extended mode assembles multiple monitors into a single virtual display.
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That driver only allows for “clone” mode - where the external display duplicates the Mac’s primary screen, sans controls, such as resolution - but leaves the most popular “extended” and “mirror” modes broken. These features continue to work as expected in 10.13.3.”Īs a partial solution, DisplayLink has released a preview version of its latest software driver, labeled “4.3,” for macOS. We have alerted Apple to this issue and are working hard to find a resolution. “Functionality such as Ethernet and audio, where implemented, is unaffected. “We are 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 installed,” reported someone identified as “Wim” and a product manager at the Palo Alto, Calif.-based DisplayLink.
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Some writing on Apple’s support forum said that they had rolled back to 10.13.3 from backups, but were unsure how to proceed, since failing to install 10.13.4 - and updates after that - meant leaving security vulnerabilities unpatched. EVERYTHING worked fine before this upgrade,” groused JPyre on the same thread.
“I have been using a plugable dock for 6 months with 3 monitors with NO issues. “I’ve got a very large number of Macs that I cannot permit this upgrade to be deployed to in my enterprise as it will cause enormous support issues,” reported BradSP on March 30, who caught on to the problem before he rolled out 10.13.4. Many work in corporate offices that had equipped workers with docks for their Mac, and multiple monitors that no longer showed anything. When Mac users saw blank displays, they raised a ruckus on Apple’s support discussion forum.
Companies including Dell, HP and Kensington sell docks that rely on DisplayLink. MacOS 10.13.4, which Apple released March 29 and immediately began pushing to users, has crippled DisplayLink, the technology from the same-named company that allows multiple monitors to be connected to one PC, often through a hardware dock, via USB, Ethernet or even Wi-Fi.
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When Apple’s latest macOS update blanked external screens, third-party hardware vendors scrambled to warn customers and caused Mac users to call each other names.
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