Monterey 12.0.1. Second Monitor Issue

I was having the same problem as everyone else is lamenting here. I finally noticed however that my Macbook was actually on battery power, though the power cable was attached, and in the settings for displays, for when on battery power, there is no option you can set to not sleep when the lid is closed. I had thought my laptop was on the wall power, so I thought the no-sleep option that is only active when on wall power, was active. It was not, and the laptop has a sensational battery life so I just did not notice until the battery was at 1%, when I thought, dag nab it, and looked under the desk to find the white power brick knocked akimbo from the socket. As soon as this was corrected, and the laptop was back on wall paper and the battery was charging, all the expected behaviors returned. The laptop secondary screen remained on when the lid was closed, and the device did not sleep, and therefore did not blank the screen. So, in my case, the entire brain-straining Apple-teeth-gnashing ordeal came down to not being plugged into power and thinking I was, the unobtrusiveness of being on battery power (I had settings to not dim anything or otherwise change performance on battery) and the long battery life. Problem thankfully solved, as least for me, and I hope for at least a few others.

Getting a bit off topic, maybe? The Apple platform is known not only for its quality of technology over Wintel but its civility of discourse, cultural integrity, and overall aura of uptone outlooks and classy behavior, vs. the sordid rabble of brylcreem & muscle-tees, hollering and fisticuffs making a racket over at PC High ... a contrast I hope you will consider helping to maintain.

Im sorry but that's just naive thinking and I strongly disagree. Don't want to open this thread up to Apple bashing, but it does need to be said. There are stark differences in product quality since the Jobs days. Update after update, Apple has proven unsuccessful in releasing a decent operating system that doesn't involve breaking legacy software/hardware. From AV plugins, to monitors not working, to spotlight breaking time and time again, to peripheral hubs getting out dated, to performance and lag issues. I can literally write a book about how many issues they have been having recently - which also worth noting were not a thing during the Jobs days. Overpriced machines? Fine, but at least deliver a product that is deserving of the eye gouging money they are asking for their products. I thought the high prices for Apple products were supposed to be synonymous with seamless integration between hardware/software, unrivaled support, etc. All of that is going down the drain, and I don't blame the several posts above me for being upset that this issue did not get caught during Beta testing.

This is getting even more ridiculous. I bought a HDMI-DisplayPort cable thinking that I could use that available DisplayPort to extend my screen to my Dell monitor while USB-C to USB-C to the monitor is working fine with peripherals (SSD, HDD). MacOS does not recognise the display! What the h*** is going on? Only thing working is HDMI-HDMI connection. APPLE FIX THIS PROBLEM ASAP!

I have a Macbook Air 2017. I updated to Monterrey 12.1 : the camera and the displayport output stopped working. Now I'm without a camera and I can't turn on my second monitor either!! I've tried ALL the tips on the internet (SMC, NVRAM, etc) and none worked. I tried formatting and reinstalling, but that didn't work either! I need help please!

Why has this issue not been resolved. The only thing I got from support was to downgrade to BigSur!! Who has time for that???? I need my second monitor and it worked fine until I upgraded. Apple needs to get on this ASAP especially with people having to work from home!!!

My monitors showed well under Monetary 12.01, one connected to an HDMI cable and another one to a USB-C. Unfortunately, the HDMI connection failed when I upgrade to Monterey 12.1. I did check all the cables and was very sure that the HDMI signal from my 2018 MacMini was no longer to act. Is there anyone who encounter the same problem?

I am on a m1 Mac mini with Monterey 12.1 and I have two monitors connected, an older apple Cinema display via an apple adapter to the HDMI port and an older Samsung monitor through an apple usb-c to vga adaptor to an usb-c port.

The Cinema Display works fine and while the Samsung shows the same but empty desktop I am not able to access the screen via mouse.

When I unplug the Cinema Display from the HDMI port the desktop on the Samsung on the usb-c port becomes accessible

and all my open windows etc show up.

I tried alternating between the two usb-c ports but no luck.

Thank you.

I have this same issue and cannot use my second monitor at work or home - it is very important in our workflow, for screen sharing during zoom meetings, and design projects. IS THERE A BUG FIX yet for Monterey 12.1?? OR CAN WE INSTALL A PREVIOUS OPERATING SYSTEM?

January 27, 2022... I just did the upgrade to Monterrey, Big Mistake. I lost my second monitor. Im journalist and I work editing video, nor mi Macbook Pro is useless to do my work properly. I did all your recommendation above and doesn't work.

I just did the update to Monterey 12.2, hoping it would resolve my problem, and I still cannot use my external monitor. I can use it on my IPAD, but not on my Macbook Pro 12 inch 2019. So I know it is not the cable, it is not the monitor. I am so frustrated, as I too need it for my work at home setup.

Honestly it just needs to be said - WTF is Apple doing? They spent 3 months on fine tuning Monterey, and this issue STILL doesn't get addressed? This is the final nail for me unfortunately. I know for a fact this issue was widely reported across multiple users. I personally escalated it to their Sr. Devs who assured me it would get resolved on the next update. The fact that they put out another **** update really calls to question the direction is headed in as a company. They aren't listening to their users. Shame on the entire Apple organization honestly. I hope they see this.

Hello, I've the same problem with Lg Ultrafine 5k and M1 Pro 16", I've tried all the ways recommended, and is impossible to use the Lg screen, 2 days ago I updated the latest Monterey version. Please anybody can help me. Thank you.

None of the proposed solutions have worked on my system. My monitor has HDMI ports only, so the USB solution isn't possible, but I did try bypassing the computer's built-in HDMI port, which made no difference. And no change with OS 12.1 or 12.2. I'm right where I was when I got this 2021 M1 Macbook Pro in December: The monitor detects the computer, but the computer doesn't detect the monitor.

I just updated to Monterey 12.2 and the problem still persists. I have managed to connect the secondary display via USB-C in my MacBook Pro a couple of times in the last weeks but seems like just pure random luck.

Dear APPLE FIX THIS.