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Question: 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

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Dec 17, 2020 2:39 AM in response to fuzzylogic_uk In response to fuzzylogic_uk

Same problem here, very frustrating and hugely damaging to my productivity.


I have two identical external 28" 4k monitors, and two identical USB-C to DisplayPort cables. This was all working fine under 11.0.1, and it's all working fine through my Windows laptop, 4k60 on both externals.


About This Mac reports one of them as a 28" 4K and the other as a 30.5" 1080p for some bizarre reason. I assume that in fixing the issue with 5K LG monitors being reported as 4K, they broke this and didn't notice.


I've got a 16" 2019 Macbook Pro, and this is very frustrating. I'm currently downloading the first 11.2 beta, will see if that helps, if not, I'm going to have to downgrade to Catalyst until they sort it.


Thanks, Apple. xx

Dec 17, 2020 2:39 AM

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Dec 17, 2020 3:15 AM in response to fuzzylogic_uk In response to fuzzylogic_uk

Same problem. External monitor is BenQ PD2700U which will only give a maximum resolution now of 1920x1080 and the dialogue screen to select the resolution has changed from horizontal thumbnails to a vertical list of 3 choices.


I would LOVE to know when you're going to fix this ... I presume all I can do in the meantime is roll back to the last backup before the upgrade.

Dec 17, 2020 3:15 AM

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Dec 17, 2020 3:24 AM in response to fuzzylogic_uk In response to fuzzylogic_uk

Seeing a lot of these logs lines repeating over and over



error	11:01:59.843595+0000	corebrightnessd	First attempt at IODisplayCommitParameters for displayID 0x4281106 failed. Refreshing service and retrying.
error	11:01:59.843918+0000	corebrightnessd	service=23839
default	11:02:00.416203+0000	WindowServer	[WARN] - IOFBSetDisplayModeAndDepth: Mode has dimensions 1280x720
default	11:02:01.292395+0000	WindowServer	[WARN] - IOFBSetDisplayModeAndDepth: Setting mode 0x80003097 with depth 0x1 on displayID: 0x0 fbRegID: 0x100000680
default	11:02:01.292419+0000	WindowServer	[WARN] - IOFBSetDisplayModeAndDepth: Alias:0/AppleBacklightDisplay-610-a044
default	11:02:01.298640+0000	WindowServer	[WARN] - IOFBSetDisplayModeAndDepth: Mode has dimensions 3584x2240
default	11:02:01.332739+0000	WindowServer	[WARN] - IOFBSetDisplayModeAndDepth: Setting mode 0x80007006 with depth 0x2 on displayID: 0x0 fbRegID: 0x100000682
default	11:02:01.332760+0000	WindowServer	[WARN] - IOFBSetDisplayModeAndDepth: IOService:/AppleACPIPlatformExpert/PCI0@0/AppleACPIPCI/PEG0@1/IOPP/EGP0@0/IOPP/EGP1@0/IOPP/GFX0@0-1e6d-7707-83ac1c71d8e0721b
default	11:02:01.336242+0000	WindowServer	[WARN] - IOFBSetDisplayModeAndDepth: Mode has dimensions 1280x720
default	11:02:03.174174+0000	WindowServer	[WARN] - IOFBSetDisplayModeAndDepth: Alias:0/AppleBacklightDisplay-610-a044

default	11:02:03.174186+0000	WindowServer	[WARN] - IOFBSetDisplayModeAndDepth: Mode has dimensions 4096x2560

error	11:02:03.197052+0000	WindowServer	[ERROR] - Attempting to get capabilities from capabilities with no devices

default	11:02:03.210338+0000	colorsync.displayservices	ColorSyncDisplayServicesAgent: updating display profiles for user = 501 group = 20

error	11:02:03.214533+0000	WindowServer	[ERROR] - Attempting to get capabilities from capabilities with no devices

default	11:02:03.214853+0000	kernel	[IGFB][LOG  ][DISPLAY   ] [AGDC] Get link config

default	11:02:03.214860+0000	kernel	[IGFB][LOG  ][DISPLAY   ] [AGDC] Get port status

default	11:02:03.214864+0000	kernel	[IGFB][LOG  ][DISPLAY   ] FB0, port = 0

default	11:02:03.214864+0000	kernel	[IGFB][LOG  ][DISPLAY   ] FB0 Getting display status

default	11:02:03.214865+0000	kernel	[IGFB][LOG  ][DISPLAY   ] FB0 Display status is = 1

default	11:02:03.214867+0000	kernel	[IGFB][LOG  ][DISPLAY   ] Port status = 1, port type = 3

default	11:02:03.215635+0000	colorsync.displayservices	ColorSyncProfileCreateWithDisplayID(0x1b5d5be7)for user euid 501 (uid 0) eguid 20 (gid 0) succeeded. Profile desc: LG HDR 4K

error	11:02:03.216308+0000	WindowServer	[ERROR] - Attempting to get capabilities from capabilities with no devices

Dec 17, 2020 3:24 AM

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

Dec 17, 2020 3:45 AM

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

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

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Dec 29, 2020 9:17 AM in response to fuzzylogic_uk In response to fuzzylogic_uk

I was kindly contacted by an apple support represenative today who called to ask for dianostic infromation they could send to the os engineers to help diganose the issue.


Seems apple do seem to be genuinely taking the issue seriuously. I've supplied a large system diagnostics dump so hopefully this will be sovlved in the not too distant future.


Good luck all!

Dec 29, 2020 9:17 AM

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Dec 30, 2020 1:03 AM in response to VikingOSX In response to VikingOSX

My update/fix. I rolled back to the previous backup a few days before the update. This fixed the problem until I shut down the laptop completely and restarted. Now my fix is to unplug the cable from the monitor to the USB-c on the laptop and plug it back in again, then go to display settings and choose scaled – now the options are there to correctly scale the external monitor.

Dec 30, 2020 1:03 AM

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Jan 5, 2021 8:52 AM in response to fuzzylogic_uk In response to fuzzylogic_uk

MB Pro16 with external 24" Dell, and 43" LG 4k. Dell connected via HDMI splitter/hub to display port. LG was connected with provided display port cable on opposite side of MB Pro. Prior to 11.1 update, everything was fine. Dell monitor settings were ok, but 43" LG would only max out at 1080p when selecting with option key. I resorted to working off MB and Dell after I couldn't stand walleye vision anymore.


I tried most of the workarounds I could find short of installing any monitor setting apps. What finally worked today was connecting LG with HDMI cable to my splitter AND also a display port cable connected on opposite side. I connected everything prior to starting MB. Yesterday I tried all of these various connections and restarting but none of that worked. I hope the next time I connect with my plethora of cables it works until a fix is issued.

Jan 5, 2021 8:52 AM

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Question: Big Sur 11.1 4K monitor resolution settings gone since update