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30 points

Big Sur 11.1 beta forces external 4K display refresh rate to 30hz

My MacBook Pro 16 2019 has automatically upgraded to Big Sur 11.1 beta and forced my external display LG27UL550 (mini-DisplayPort) to run 4K in 30hz. How to fix this or downgrade to the stable 11.01 release?

MacBook Pro 16″, macOS 11.1

Posted on Nov 22, 2020 7:04 AM

Best reply

johnenova

Level 1

16 points

Posted on Dec 19, 2020 2:43 AM

I got it working, finally! Here's the step I did (BenQ PD2700U):

Plug in your external monitor via DisplayPort to USB Type-C
Go to System Preferences -> Displays
On both Internal and External Display, select Resolution: Default for display
it should automatically detect to 60hz

Thanks to this reference: https://apple.stackexchange.com/questions/336725/external-display-works-on-30hz

This works perfectly for me. Hope it helps.

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Big Sur 11.1 beta forces external 4K display refresh rate to 30hz

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