Big Sur 11.1 External Display Issues!

Here's the link to find a number to call in. I started with online chat and they moved me to phone so skip that online chat.

https://support.apple.com/en-us/HT201232

Hold times were pretty minimal.

The fix to change the display port version from 1.4 to 1.2 seems to work for me. Hoping Apple address this soon too

What you have to do, is to connect the charger on the HUB-port and not direct on the computer and then connect your externals display directly on your computer.

Please report that to Apple!

Might be a faulty Cable. Belkin is replacing mine free of charge.

To report this huge bug to Apple: https://www.apple.com/feedback/

Please write to Apple. This problem must be taken seriously.

If you want this problem fixed, you have to put pressure on Apple. So call customer service and report the problem here: https://www.apple.com/feedback/macos.html Do both: call and write.

The latest update is macOS Big Sur 11.2.3 update that fixes some web vulnerabilities that just came out today, Monday, March 8, 2021.

try disconnecting the displays, reset your pram/SMC. Restart the machine, shut down, reconnect displays and see what happens

Yes I was and it was my fault. My dock was in blame, as I changed it is simply works. Maybe the Mac could tell me that.

I'm having the same issues. Big Sur 11.1 on a 2019 MBP 16".

Connection is USB-C to an LG 4K 32" which has been working fine for a couple years @ 60hz. After the update, the monitor has a bevy of issues including wrong resolutions, wrong refresh rate, and variations of that depending on what order I plugged in the cable and what color t-shirt I am currently wearing.

Reset PRAM and SMC probably 80 times at this point. I even swapped the LG provided USB-C cable with an Apple Thunderbolt 3 cable which had the same issues.

It's likely a software thing and I've seen enough reports online such that I'm surprised that this issue survived the beta period.

Since I can’t edit my comment, I’ll add to the thread:

i’m seeing two issues:

1. Displays being detected incorrectly, leading to scaling and refresh rate issues;
2. Displays not being detected full stop.

All these issues seem to be on 16” MBPs.

@mwventre was able to circumvent the first issue by forcing the resolution and framerate from the display onboard menu on an LG display.

How does such an issue get through a public beta...

Thanks, but I think I have turned it on and off and unplugged it enough times to meet the criteria for David Hume’s regularity theory of causation to rule this one out.

A few people have suggested this has worked, but not, alas, for me.

I have found HDMI (instead of USB-C) works for me, although some say this doesn’t work for them either.

Can’t say I know much about about hardware i/o, but seems it’s an issue recognising the display hardware? So with the right cable/display model combo you might find it works.

I’d be interested to see if anyone who finds that HDMI doesnt work around the problem if they tried another monitor model it might work?

Someone has said a fix is in the 11.2 beta so should be incoming soon-ish.

I have this issue with an LG 4k monitor via USB-C. My only solution is to continually powercycle the monitor until it eventually gets the right resolution. It's a pretty mundane game I play every morning before work.

Exactly same issue for me:

• 2019 MBP 16"
• Just updated to BigSur 11.1 from Catalina
• BenQ EW327OU connected via USB-C

All worked fine on Catalina. After updating to Big Sur the mouse cursor was laggy on the BenQ. Reset SMC and this was fixed, but the default resolution had change to 1080p, with no 4K option using the 'option+click' trick. Luckily I was able to get 4K by unplugging and replugging the USB-C cable, but this obviously shouldn't have to be done every time I boot up. Hopeful for a software fix soon.