Big Sur 11.1 4K monitor resolution settings gone since update

Updated to 11.1 on my 16 inch MacBook Pro two days ago, ever since I can no longer run my LG 4K monitor at anything above 720p/1024x768.

Have reset SMC & PRAM. Have also OPTION + Click scaled for more options - no dice.

On a google search quite a few other people reporting this issues (also with previous beta versions of Big Sur).

My last option is reinstall macos, which I really don't want to do this is a bad time for this to have happened a lot of work on hunched over a laptop screen cursing the aches! I'm too old for this crap :)

So wondering...

Is there a known fix for this?

Is this a known problem (I can't find anything on these forums when I search)

If this is a known issue, is there a fix incoming from apple?

Thanks!

Posted on Dec 17, 2020 1:22 AM

Top-ranking reply

jordanz

Level 1

18 points

Posted on Jan 5, 2021 3:26 PM

FYI - this worked for me. I had to change it in my BENQ's menu. Changing down to DisplayPort 1.2 has fixed the problem for me.

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36 replies

Dec 17, 2020 3:45 AM in response to fuzzylogic_uk

Ok, some progress in isolating the issues and work around.

Have got 4k working by using the apple usbc to hdmi cable (I have the 3 port one, with hdmi, usbc, and usb ports).

macOS now recognises my monitor correctly and displays 4k.

mwventre

Level 1

9 points

Dec 17, 2020 8:15 AM in response to BDStanley

Having same issue. MacBook Pro 16 connected to 43in LG 4K display via usb-c to usb-c

Before 11.1 - no issues. display correctly identified and able to display native 4k resolution with HDR enabled

After 11.1 - display make and model not recognized correctly. Native resolutions incorrect. Max resolution 1080p and sometimes 800x600 depending on the sequence of plugging and unplugging the connection

Reset PRAM - no change

Reset SMC - no change

Temporary workaround for my particular display is to use the internal OSD controls to alter display port settings. My display allows me to change which version of display port it uses. My options are 1.4, 1.2, and 1.1. Factory default is 1.4 which supports HDR. When I set it to display port version 1.2 I get the ability to run at a native resolution of 4k (3840x2160) back but lose HDR support. Refresh rates stay at 60hz no matter what version I'm using.

Sounds like apple fixed one problem with one particular monitor, but broke lots more in the process of this update. How this was not discovered during beta testing I do not know.

Dec 18, 2020 7:05 AM in response to fuzzylogic_uk

The same issue with my MBP 16" connected to a 32in LG 4K-UHD (LG 32UD99-W) (please see also https://discussions.apple.com/thread/252174979)

While burning the firmware with newly "Bug Sur" 11.1 I even got a message from my LG stating that the resolution's changing to - hold an believe - "1920x1080" and I should change the resolution to "3840x2160" for more comfort ...

In this discussion https://discussions.apple.com/thread/250715148 I found a reference to "DisableMonitor 1.92".

I tried this workaround and it worked for me ...

[Link Edited by Moderator]

Dec 17, 2020 3:21 AM in response to fuzzylogic_uk

After some digging have found some console logs for future reference attached here

console log

Dec 17, 2020 3:27 AM in response to BDStanley

1920x1080? You lucky thing, I'm jealous!

Dec 17, 2020 4:04 AM in response to fuzzylogic_uk

I tried HDMI from monitor to USB-c splitter but it didn't work.

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Big Sur 11.1 4K monitor resolution settings gone since update