Something macOS Big Sur Users who are running 11.1 and recently released 11.2 update There have been ongoing issues with external ads based on multiple reports about the MacRumors Forum, Apple Support Communities, Twitter and Reddit.

There are at least two separate issues, but both relate to external display connections. The problems seem to have started with the macOS Big Sur‌ 11.1 update, and the 11.2 update did not provide a solution and in some cases made the problem worse.

The first problem results in USB-C ports not recognizing external monitors and external displays becoming unusable and unable to connect. This seems to affect both DisplayPort and HDMI displays, which are connected directly and through hubs and adapters.

We saw this issue firsthand after upgrading a MacBook Pro to OSmacOS Big Sur‌ 11.2. The update prevented an external monitor from connecting to USB-C and there are several other complaints from affected users. From Reddit:

Upgrading to 11.2 interrupted my second external monitor connection.
Primary monitor LG Ultrafine 4k (Mac version) connected via Thunderbolt.
Secondary monitor (same model) that is connected via HDMI-> DisplayPort adapter (BENFEI), then the DisplayPort-> USB-C cable no longer works after the update (worked perfectly under 11.1 before the update).
macOS seems to detect the monitor and resolution as shown in the display settings, and Apple Support was able to remove them to my computer and show both screens. It’s almost like the signal to turn on the monitor isn’t being sent.

The second problem leads to resolution problems with external displays that cannot work at full 4K resolution of 60 Hz, but are locked at 30 Hz. In some cases a 4K monitor will only be recognized as a 1080p monitor.

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

Mac users didn’t have these issues in the first version of MacOS Big Sur 11.0.1, and it appears that the macOS Big Sur 11.3 update The version released yesterday does not fix the problem either, but Apple still has some time to work on a fix before the 11.3 software is released.

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