Big Sur 11.1 External Display Issues!

Untfortunately not solved yet (macOS 11.2.2). My Benq-monitor ist still not working over Thunderbolt 3 in Display Port Mode 1.4. It has to run with 1.2 to be detected correctly. According to Benq support this is not an monitor issue. Only Apple could fix this.

I've opened a ticket last year when the problem occured for the first time. It's been escalated to the specialist department and reported to the developer team. Several os-updates passed by but no solution so far.

I had several problems with Big Sur at the start: Bluetooth mouse kept disconnecting/connecting at regular intervals; monitor not connecting via USB-C cable. Since 11.2.1 the issue with the mouse disappeared, now it looks like (at least for me) also the one with the monitor disappeared.

I still seem to have some issues with running some software installed cia HomeBrew (e.g. emacs), but I’m not sure if it is related to the OS or XQuartz...

I confirm that my LG 4K HDR is working on USB-C -> DP cable after upgrade to 11.2.2, but I can't seem to get 60 Hz refresh rate (which I had before 11.1)

HDR option is available in Display Settings, so I guess this is somehow fixed.

I'm on a 2020 16 inch MBP

My Issue... New MacBook Air 13 In. Purchased 12/25/19. After I was sick of being bugged to install their latest Big CRAP update which took hours on end... of which I, held off installing until mid December 2020, my Screen would show me Tiny colored vertical lines.. No Screen Display..

Freaking out-- I turned this machine off then on. Everything came back, This has happened 4 times since then and NO ONE in their Customer Support gave me a straight answer. I spent many hours during each of the 4 or 5 calls to their Upper Tier Team. All I heard was, not sure, wait and see, take a picture, LETS DO THIS, LETS DO THAT--- in the meantime the warranty was DONE.

Over and OUT!

I refuse to purchase an expensive external hard drive etc.. Why should I !!

I was also told by a Mac computer service guy in my area that it does sound like Hardware and if that's the case HE won't be a able to get the part because MY computer is too new. Oh Wonderful !!!

I won't go further with this vertical line issue-- but I will say this about their products which we own... Apple TV's phones tablets and computers..

I AM

DONE.. and will NEVER buy another Apple Product.

I intend to go back to Bill Gates and PC's.. These Apple products are NOT worth the price--customer service plus their stores are of of no use to anyone it seems. I've heard so much crap from this company since December 2020, that I am totally confused as to what's really going on with this (3 mo out of warranty) $1,600.00 Machine! DISGUSTED and STRESSED OUT :(

I had a call from the Apple Support about this bug today. The problem remains unsolved.

I connect an 17" Eizo S1721 with a original Apple DVI to USB C adapter to a 2019 Mac Pro running a newly installed and clean version of Big Sur. The Monitor is not properly recognised, after Big Sur boots up. If I reconnect the S1721 after the boot it works as it should, until It shut down the Mac Pro 7.1 and boot up again. Another Monitor, an Eizo CS2730, is connected via an hdmi to USB C cable. This one works without any problem on both inputs of the standard RX580. The S1721 isn't properly recognised on both inputs.

The Apple support did not have a solution to this problem and suggested, that I try different adapter solutions.

It was also mentioned, that we are possibly just have to wait for an update, that fixes the problem.

I'll be checking different adapter dongles and cables now and will report if I find something that works. I think, the chances are low.

:) Thank you Tommy C-- I will give it a try. Sounds Like--- You know more than THEY DO. I appreciate your expertise. I'm sick of this.. I doubt this new machine needs -- as Apple said-- A new Hard Drive. Our issues sound more like Bad software from The BIG NOTHING operating system!

BTW.. I was told by Apple guy in my area "Its so new, I wouldn't even be able to GET THE PART. Un freaking believable! Hopefully this will work or BACK TO Mr Bill Gates! Thanks T. C. Annette M. :)

Sorry to add one more to this thread, but since I have managed (somehow!) to connect my external monitor via the USB-C cable to the laptop I am noticing another issue.

If I re-open the laptop once it has gone in 'Screen Saver' mode, I notice that Firefox is frozen; I can switch between the tabs that are already open, but when I'm on one of those tabs I cannot do anything. I can also open a new tab, but then I cannot write on the URL bar or do anything on that tab. The command bar of Firefox still works, in fact I can close the application (Firefox -> Quit Firefox), and if I close and then re-open it works. This did not happen when I connected the laptop using an HDMI connection via a docking station (LENTION USB C 11-in-1 Laptop Docking Station(CB-C95)).

Not sure if anyone who managed to get the USB-C connection going experienced the same issue....

Thanks !

Fab

@FabSalvatore

Exactly! I have the same issue with frozen Firefox after sleep, I've searched the net for similar reports but could not find recent ones! I had it on 11.2 and continues on 11.3 beta which I joined hoping to see the never ending issue with 4K@30Hz max via TB3.

I am using a MacMini M1/16GB and for me it happens also while using HDMI (native, no adapter needed), I don't see a difference with Firefox behavior related to display connection.

I was looking around for this problem with Firefox and I found this on bugzilla:

https://bugzilla.mozilla.org/show_bug.cgi?id=1415923#c136

There is a suggested solution, which is to use Firefox Nightly (v88) that should cure this bug, until the stable version 88 of Firefox comes out.

I have to be honest, since I reported this on the bigzilla page I have not noticed again this issue, so I will keep an eye; I've downloaded Firefox Nightly but still not used it.

I also have this bug using Firefox.

I am wandering if this is also the experience for Intel based Mac users or only for M1 based Mac users using Big Sur.

nb: I still (after the 11.2.2 update) have to resize my windows after waking up my computer (they are 16:9 instead of my 16:10 resolution), very annoying!

Hey everyone, before I upgrade from Catalina to Big Sur on my MBP 16, 2019 - 2.6 6 Core Intel Core i7 with 16 GB Ram - AMD Radeon Pro 5300M 4 GB. I currently have my Mac set up with 3 external monitors, yes 3, on Catalina, and it works great. I have two of the Apple USB-C to HDMI/USB/USB3 white ports, and one QGeem USB-C to HDMI (amazon). They work great. From what I have ready, I am afraid to upgrade to Big Sur - reading about all of the external monitor issues you all are experiencing!

Advice - will I run into issues with my setup if I upgrade???

I appreciate if anyone can comment or even share if they have good results.

Thanks !

If I would be in your position, I would wait with the upgrade. Even after upgrading to Big Sur, a downgrade to Catalina did not fix my issue (I assume a firmware update did the thing). Unless you don't want to feel the pain we have: wait.

@AppManCan

I have the same MacBook Model (16", Intel i7, 16GB). After installing BigSur, no external display had been working (I have tested all cables, adapters, nearly 10 displays). They even have not been recognized by the device. Reinstalling Catalina made them working again.

So I would highly recommend to NOT upgrade to BigSur, if you are using external displays (also think of presentations using projectors).

This bug is a disaster. I'm curious about to know if it will be fixed until xcode drops support for deploying iOS apps on Catalina, which usually happens half a year after the new macOS release.

I'd hold off the upgrade, My 2 external monitors were working fine 'till I upgrade to BIG SUR.

I've got:

Apple cinema display 24-inch (1920 × 1200) via mini display port

Connected via a Startech Thunderbolt dock

Viewsonic TD2340 23-inch (1920 × 1080) via HDMI

They do work, but MacBook Pro (15-inch, 2017) slows to a crawl often, especially if I use Zoom....it becomes unusable....and i have to unplug the external screens and just sue my macbook, which is a real pain when i need to manage /share several others tabs in chrome/safari etc....

I’ve noticed with Mac’s activity monitor that the CPU comes under heavy load with KERNEL_Task, WindowServer and Google Chrome Helper (render) usually at the top of the list….

I was wondering if there is an issue with overheating which can slow things down, or maybe the SSD degrading.....but it all points to something in Bir Sur that doesn't like supporting external screens.... as my Macbook is fine when nothing else is plugged in....

Come on APPLE, you've upset an awful lot of people with this....!