Big Sur 11.1 External Display Issues!

I'm also experiencing this or a very similar issue. After the Big Sur update (14.1) external monitors aren't being recognized or resolution downgraded to 1080p. I have 3x Benq PD3220u 4k monitors on a 2019 Macbook Pro that worked without a glitch on Catalina. 2 of the monitors are daisy chained on the left bus, the other is by itself on the right bus. You can tell that the USB bus doesn't feed the daisy chained devices a signal instantly, there's a lag or no signal. This never happened in Catalina where they woke up flawlessly from power nap. I even use the $$$ 2m Apple branded Thunderbolt3 cables.

Reboots don't solve the problem. There's usually a different monitor coming online each boot. I've stopped daisy chaining and now feed 3x cables directly into the MBP. This doesn't solve the problem either and one of the screens comes back as 1080p with the other two at 4k if I'm lucky.

Apple please FIX THIS.

Has anyone found a way to trigger an re-scan of Thunderbolt bus without rebooting the MacBook Pro?

Edit: the BenQ Display Pilot App now also struggles correctly identifying screens 1, 2 and 3 and will highlight the wrong device.

Just wondering if besides postíng here we can take this nasty bug to Apple directly.

Last thing I’d like to do is going to a store and consult one of the geniuses about this issue. I wouldn’t like to go there carrying my 4K screens in a trolley so they can see the issue

Same problem with me :

• Macbook Pro 16"
• External display BENQ SW271
• Big Sur 11.1

Random and multiple problems with the screen recognition (sometimes it works well (quite rare), sometime (very often) it doesn't recognize the screen (poor and too low resolution, wrong size of the screen, impossible to display at 4K native resolution).

This is the first time I have encountered such a serious bug in years of Mac usage - does Apple read these forums? I assume everyone who has posted on here has also sent a bug notification to Apple - the more of us who do this the better.

I spoke to tech support a few days ago and worryingly they claimed that my call was the first they had heard of this issue, and they weren't aware of other users having problems. Like others I am very frustrated that my expensive monitor is currently of little use. Luckily I am not working much over the holiday period, but when I 'return' in January, this is really going to dent productivity.

I have exactly the same problem. I manage to turn on the correct resolution, but the monitor is stuttering very badly (probably 20-30fps). Apple, please fix it! It is impossible to work normally on a 4k monitor.

Monitor model: LG 32UD99-W

Same here. Seems this is all over the internet as an 11.1 issue. They screw up every single upgrade. It's the only thing Apple do reliably these days.

I guess the days of folks being proud to work there are long passed.

Is this the same problem? My external monitor is Sceptre. Computer is MacOS Big Sur version 11.0.1. The display on the external Sceptre is stretched. We’ve tried all the display resolutions and it’s still stretched. MacOS Catalina worked fine on this external monitor. The guy at Apple said I need to get a compatible monitor and sent me a link for a $5000 monitor. What?

Is this the same problem? My external monitor is Sceptre. Computer is MacOS Big Sur version 11.0.1. The display on the external Sceptre is stretched. We’ve tried all the display resolutions and it’s still stretched. MacOS Catalina worked fine on this external monitor. The guy at Apple said I need to get a compatible monitor and sent me a link for a $5000 monitor. What?

Same problem with my external ViewSonic VX3276 4k MHD monitor. Upgraded to 11.1 on my Macbook Pro 2019 with my AMD Radeon Pro 5500M graphic driver and I cannot get 3840 resolution anymore. Tried various workarounds to no avail.

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!

How lucky you are. I also contacted the Apple support today and it was absolutely useless. I wasn’t sure what was less helpful: the support or a piece of dry bread in my kitchen. It’s so ridiculous that I can’t use my screen anymore. I cannot believe that Apple is planning to make a car. They should start out with getting their current products fixed!!

Same issue on a MBP 16 connected to a Benq pd2720u through thunderbolt 3 port. The Mac loses the external display setup any time it is disconnected. Resolution is no correctly set and refresh is 30Hz. Never had an issue before updating to 11.1.

can’t believe Apple has released an update with such big issues!!!! It has a huge impact on productivity

Hello,

same here . I purchased a 49” philips 5k.

i thought it was the monitor and I returned to amazon.

then today I purchased a 49inches samsung and the same. Fresh installs big sur and nothing.

thanks

made A try with switchresx today (also installed display link but the external monitor was not recognised).

I forced the 4K res at 60Hz and rebooted. At startup the MacBook Pro 16 fans started at full speed and all screens were black. I kept power button pressed and restarted. The duly stem booted, the ext display was set at 4K res but still at 30Hz 😭😭😭😭

Has anyone downloaded the beta version of 11.2 to see if the problem persists?

I'm freaking out because I'm completely unable to use my external screen anymore. It's not just the quality of the picture. I would gladly take a worse resolution. The display is either not recognized at all or the with an HDMI-cable connected to a HDMI-USB-c adapter the picture is flicking continuously making it impossible to use it for work!

It is so f..... ridiculous considering the sh... amount of money that they are making with their crap!!!