Intermittent resolutions and refresh rates on MacBook Pro 16

[Cf2]

MBP16 w/ 5500m on Big Sur 11.1.

I am getting very inconsistent behaviour when plugging and unplugging the dock when using the display #1 DisplayPort connection. I have 2 LG 27UK650 displays. If I only connect 1(either monitor) to display 2 over DisplayPort it will come up at 4K60. The second displayport will seemingly randomly be 1080p/60 and 4K30. If I use the HDMI output on display 1 it sometimes comes up at 4K60, most of the time at 1080p60 or 4K30

I thought it might be a cable issue so I went and purchased 2 6ft VESA certified DP cables and the issue still happens.

[Cf2]

After further research this appears to be an issue with macOS 11.1

https://discussions.apple.com/thread/252186760

[Joshua_H]

Hello,

Thank you for contacting Plugable support! Sorry to hear about this issue. I’d be more than happy to assist you.

As you’ve found, indeed we believe this to be a problem with Big Sur 11.1. We recommend submitting feedback to Apple, the more users reporting these regressions, the sooner we can expect to seem them fixed: https://www.apple.com/feedback/macos.html

See here for additional examples of others who are reporting the same kind of problems with other displays and devices:
https://www.reddit.com/r/MacOS/comments/kd2ym7/macos_big_sur_111_featurebug_megathread/

Please don’t hesitate to let us know of other questions.

Thanks again for contacting Plugable support and best wishes!

Joshua Henry

Senior Engineer | Product Owner
Plugable Technologies