macOS 14.4 disables USB hub support for some external monitors

Apple recently released macOS Sonoma 14.4, which introduces some new features as well as security fixes. However, the latest update to the Mac operating system is also causing problems for some users. In particular, macOS 14.4 appears to lack USB hub support for some external monitors.

macOS bug affects USB hub for external monitors

As reported by Himanshu Arora in Tech-Issues Today, there are many reports Mac users are experiencing problems with external monitors after updating their computers to macOS Sonoma 14.4. The update breaks the USB hub functionality of some displays, causing peripherals such as a mouse and keyboard connected to an external monitor to stop working.

The website lists several posts from Reddit, Apple Community and Dell forums where users are complaining about the macOS 14.4 update. “After updating, my keyboard and mouse are no longer detected on my MacBook. Before the update everything worked fine” said the owner of a Gigabyte M34WQ display.

“I have the same problem with my MacBook Pro M2 Max with 64GB RAM and a Dell U3219Q monitor; None of the USB peripherals connected to the monitor's USB hub are working” another Mac user complained. “On the contrary, all peripherals work fine when I connect a Windows computer to a Dell monitor,” he says. added by the same person.

Apple has not yet confirmed the problem or released a software update to fix the bug. In the meantime, users have found workarounds. If this error has affected you, here's what you can try to fix: