MacBook Pro 16-inch with MacOS 11.1 unable to detect display correctly and set screen resolution

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MacBook Pro 16-inch with MacOS 11.1 unable to detect display correctly and set screen resolution

Since updating the MacBook pro from MacOS 11.01 to MacOS 11.1, MacBook Pro 16-inch (2019) is not able to correctly detect the LG 43UN700-B 4K Monitor. When attached the screen resolution on the external display scales down to 1080p or 720p or 1280p randomly on each attempt to connect the display. The display connected via USB C cable. Everything seemed to work well before. Even tried resetting the NVRAM / PRAM and SMC. Nothing seems to work.

Any similar occurrences? Appreciate your support.

MacBook Pro 16″, macOS 11.1

Posted on Dec 17, 2020 9:49 PM

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Answer 1

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hari_ls Author

Level 1

8 points

Dec 19, 2020 2:25 AM in response to water_vapor

It seems this has a workaround. You can go to the On-Screen Controls on the Monitor and downgrade the DisplayPort version to 1.2; once you do that you'll be able to get up to 4K with 60Hz refresh rate. Only the display will not be correctly identified, but it works just fine.

I found this workaround from other thread in Apple Discussions (https://discussions.apple.com/thread/252174979?answerId=254142480022#254142480022).

Hope they (Apple) resolve this issue soon!

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Answer 2

Dec 19, 2020 1:44 AM in response to hari_ls

I have exactly the same setup. The monitor no longer works at USB-C or DisplayPort; all downstream USB ports stopped working too. You can use the HDMI ports to get 4K@30Hz if you can tolerate the low refresh rate (with USB-C you can also get 4K@30Hz but with very low probability). I have made a TM backup and downgraded to 10.15.7 (data recovered using migrate assistant), most softwares worked fine, though I had to refresh some binaries from Homebrew. Downgrading to 11.0.1 seems to be very hard: it is impossible to download the installer from official sources, and the installers (both 20B29 and 20B50) I found with correct shasums never worked (strange errors when creating install media, installer app won't open).

I've tried examining/overriding the EDID, changing settings with SwitchResX, connecting to HDMI and then USB-C (suggested by other posts), but none of them worked.

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Answer 3

Ilya2020

Level 1

4 points

Dec 21, 2020 11:29 PM in response to hari_ls

Another workaround as one time until sleep/reboot. Try switch displayport/type-c. You could get it work. Randomly! Until the first sleep/reboot. :( Apple is getting worse with it's product.... :'(

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MacBook Pro 16-inch with MacOS 11.1 unable to detect display correctly and set screen resolution

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