Monterey 12.0.1. Second Monitor Issue

Has 12.3.1 fixed the External Display issue for anyone...?

It seems that Apple has acknowledged the issue by virtue of putting out a fix... for some of us, but unfortunately not for me. If you are a Mac Mini (2018) owner, seems your problem may have been resolved. Even though I am on a MacBook Pro, I had hoped that there would be a chance this fix would resolve for all platforms.... unfortunately not the case.

This update [12.3.1] fixes the following issues:

- USB-C or Thunderbolt external display does not turn on when connected to Mac mini (2018) as a second display

- Bluetooth devices, such as game controllers, may disconnect from your Mac after playing audio through some Beats headphones

I am still faced with a situation where the MacBook is aware of the External Display being connected, but does not put out a signal to it. Anyone want to place bets on when(if) Apple will put out a general fix for all platforms..?!?

I had the same issue and did a ton of research, none that actually helped. I was about to reinstall Big Sur in recovery mode, but that didn't work, so I just restarted my computer to try to do more research. Surprisingly, just rebooting and reinserting the USB fixed the problem!

Currently running Monterey 12.3 and everything seems to be working as it did with Big Sur regarding the extended display.

I wish these tips worked, but they don't. Since updating to MacOS 12.0.1 Monterey, my MacBook Pro can rarely connect to my Dell U-Series 38" Screen LED-Lit Monitor (U3818DW) external display. On boot up, the laptop LED screen briefly flashes about every 4 seconds as the laptop tries to display a background and dock on the Dell external monitor. Very rarely, after more than 10 tries, the laptop can connect. I can only use the monitor by going into clamshell mode. Sometimes I can start in clamshell mode, then open the laptop lid, making both displays work. Laptop is a MacBook Pro (16-inch, 2019) with 2.4 GHz 8-Core Intel Core i9, 64 GB 2667 MHz DDR4, AMD Radeon Pro 5500M 8 GB. Never had any trouble with previous OS. I see that there were many reports of this problem in Beta. Good stream on Reddit reports that fixes were attempted.

Of course, this problem is alleviated when bypassing my hub and connecting my external monitor to my MacBook Pro directly via USB-C, but I'd rather only have one cable to plug into my laptop when sitting down at my desk—like I did before upgrading from Big Sur to Monterey.

My m1 MacBook Air can't see any external monitor when plugged in via USB-C. Weirdly, it could see it when a hub was attached and HDMI was used.

I've decided to downgrade to Big Sur until this fixed. Big Sur will always recognize an external monitor.

Same here. After upgrading to Monterey, my second monitor is not detected. And, there is no "detect monitor" button via holding "option" key on the Display Preferences menu. Huge oversight on Apple's part.

I have this issue as well. I connected the second display to another MacBook Pro with Catalina installed, and had no issue with the display working.

Only happened when I updated this morning to Monterey.

My problem exactly. Just updated to Monterey 12.0.1 - good lord, this is why I always hate updating - it's always something. Apple - please let me use a second monitor again. Come on. And yeah, the unplug and plug back in - I bet every one of us did that, like I did, as a first line of trouble-shooting.

I have the same issue just to pile on. I've tried all the fixes above. I can get an external monitor working only by plugging in directly, and I have to bring up the second external monitor wirelessly. I don't know how much noise needs to be made before Apple figures out a fix on this.

This feels like old apple right now, where you couldn't trust the updates. I don't want to have to go back to manually updating all my devices after the second or third iteration comes out and all these bugs are fixed.

This is really poor on apple's part that there's not a bug fix for this yet. I've been checking to see if the software update is available for almost a month now.

Preach! SO MANY MacBook users operate with at least one external monitor- and you’re right about the noise being made about this.

Hope they roll out a fix soon as it’s quite difficult to design on a single laptop screen.

So I have two Dell 27in 4K monitors running through a Cal digit element hub with a single thunderbolt 4 cord going to the 2021 16” MBP clam shelled.

A temporary workaround that worked for me was to increase each display scale to a higher resolution. Once I did that the screens both stop flashing. It is still not picking up hdr on either monitor but at least it stopped flashing.

With that problem temporarily fixed, every so often I the second monitor starts flashing. I just change the display scale a few times and it works.

Obviously this needs to be fixed but I hope these temporary solutions work for you.

I have two monitors connected using 2 Verbatim USB-C hubs connected and while it works most of the time, it often fails by hanging the machine or slowing it down significantly and displaying garbage on the screen or some UI widgets are red.

I wanted to give everyone an update on this unresolved issue. I received several missed calls and email correspondence from Apple Support and finally arranged a phone call yesterday (12/2). The point of the call was to gather details about my issue (our issue) with Monterey not allowing our Macs to recognize a second monitor. Alex from Apple Support reached out to me as a direct result of this thread. So, Apple is aware and a patch is in the works. I hope this news gives you some solace.

I also had an in-depth call with an Apple support representative who reached out to me from this forum. This included video of the issue being sent and trying a number of things to see if the issue would resolve.

he’s planning to follow up today, so it appears that this issue has surfaced and made its way up the list at Apple.

PLEASE! This is driving me nuts as well. The only way I can get the monitors to work is when I quit every application. Then, once I have been working on Final Cut for a while, or Photoshop, or Logic, they start to flicker again.

I too hope that a bug fix happens soon.

A significant amount of every day is spent trying to find a workaround.