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Some users have problems with external monitor connection with macOS Big Sur 11.1 and 11.2



Some macOS Big Sur users running 11.1 and the recently released 11.2 update have experienced ongoing issues with remote monitors, based on several reports of MacRumors forum, Apple Support Communities, Twitter and Reddit.

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At least two separate issues are played, but both are related to external monitor connections. The problems seem to have started with the update ‌macOS Big Sur‌ 11.1, and the 11.2 update has not provided a solution and in some cases has exacerbated the issue.

The first problem causes USB-C ports not to recognize external monitors, rendering external monitors unusable and unable to connect. This seems to affect both DisplayPort and HDMI monitors that are connected directly and through hubs and adapters.

We first saw this issue after upgrading a MacBook Pro to ‌macOS Big Sur‌ 11.2, with the update that prevents an external monitor from connecting to USB-C, and there are several other complaints from affected users. From Reddit:

Upgrading to 11.2 broke my other external monitor connection.
Primary monitor LG Ultrafine 4k (Mac version) connected via Thunderbolt.
Secondary monitor (same model) connected via HDMI-> DisplayPort adapter (BENFEI), and then DisplayPort-> USB-C cable no longer works after updating (worked well 11.1 before updating).
macOS seems to recognize the screen and the resolution as it appears in screen settings, and Apple Support managed to remove it to my computer and see both screens. It is almost as if the signal for the screen to turn on is not being sent.

The second version results in resolution issues with external monitors that may not work with full 4K 60Hz resolution, instead locked at 30Hz. In some cases, a 4K screen is only recognized as a 1080p screen.

It seems that many of those affected by display issues have a 16-inch MacBook Pro, but there are also reports of other Macs having the same connectivity issues. It does not appear to be a reliable, widespread and tested solution or solution at this time.

Mac users did not experience these issues in the first release of ‌macOS Big Sur‌ 11.0.1, and it seems that the MacOS Big Sur 11.3 update released yesterday does not fix the issue, but there is still some time for Apple to work in a fix before the 11.3 software sees a public release.




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