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Same here, mac mini 2018 + LG 32UL950. Connected via Thunderbolt doesn't work anymore, but I managed to get HDMI working when disconnecting Thunderbolt. Colors seems a bit off though, but workable for now. Waiting for 12.3.1
 
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My uncle had an HP display with his old Mac mini. Had issues going to sleep. Would often immediately wake up. Not running Monterey.

So we get a new Mac mini and an Acer display last week and we have the same issue.
 
So no rush to buy a Mac Studio (as that's Monterey only). I'm still on dual 1920x1200 connected via usb-c to displayport. HDMI didn't work, it kept disconnecting a monitor. I wonder if Apple even remembers the 1920x1200 monitors...

Say, the new studio display is 16:9. I was hoping for 16:10. Whine whine.
 
I might just go back to Big Sur. Monterey is like the Windows Vista.

Mac Studio owners are probably stuck on 12.3

Intel Macs can go back or even run 2 different versions of macOS.

Thats what scares me about the future of macOS on Apple Silicon.

You Cant Go Back. sort of like iPadOS.
That is incorrect. I regularly install Big Sur on my M1 Air and M1 Pro for testing purposes using Apple Configurator 2 and the proper IPSWs. While Apple could change this in the future, they do NOT block downgrading, as long as the computer previously support that O/S.
 
This has been an on going issue from way before Monterey 12.3. I have 4 large 52 inch LG Smart tvs throughout my house, I use one in my office as my main screen on my 2018 Mac Mini, ever since Catalina, into Big Sur and then into Monterey 12.2; I've had this issue where I can use the Mac mini for several hours not shut it down, turn the LG smart tv off come back several hours later turn the LG smart tv back on and it says "No Signal", tested it on all four of my LG Smart tvs in my house and they all do the same thing.

Seeing as I'm an Apple Advisor, I created a test account and tested it, still happened, disconnected all other devices from the machine, even erased and reinstalled ran the machine completely vanilla on a new install and it still happened on all 4 of my LG Smart tvs. I even tested using with 3 different HDMI cables.

I decided to bite the bullet because it was just getting extremely annoying, and just call Apple to see if I can get the issue escalated to SSE.
After speaking with Tier2 they went through the motions with me and we pulled logs, seeing as every time the issue happened I'd create a new entry into the feedback assistant and uploaded logs. The tier2 advisor had me upload all my logs along with making me run some data collection tool on my machine and then upload the logs for them along with screen shots of my system preferences display window.

I think about a week went by and I got a call back from the tier2 advisor and he gave me an update and let me know that engineering didn't see the graphics controller dropping off or cutting out so it wasn't a hardware issue, and didn't see the anything concerning in the logs neither.
So they decided it might be my cable or it needed me to use an adapter, so they sent me both. I tested with the adapter but it lowered refresh rate from 60hz down to 30hz which was not acceptable on a 52 inch screen, just wasn't going to happen. Left the new cable in they sent me.

The issue was still present, let the tier2 advisor know that. He then called me back a few days later that the engineers let him know that they would be pushing out a firmware update for HDMI, that I can expect that in 12.3. I thought great so Monterey 12.3 gets released I installed it and so far it was fine for a while, but then I left my machine running over night, woke up to turn on the screen and it says "No signal" .....SMH.

I really hope they get it together. I might have to call Apple back and have them reopen my case.
I posted the issue on Open Radar.
 

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I bought an M1 Mac mini when it was first released, and have had problems with connecting to an external monitor since day 1 (long before 12.3). It’s connected via USB-C, and I frequently have to unplug the cable from the back of the monitor and plug it back in again to get it to work (problems range from monitor not waking up, to displaying the desktop ‘frozen’ over ~75% of the screen with the mouse pointer frozen on the desktop, and a second pointer that moves around the entire screen, but doesn’t interact with anything…).
 
Occasionally, I have a garbled screen when I wake my M1 mini. I have to unplug and replug the HDMI and then it works. I have NOT updated to 12.3, so it seems like this issue was already there, but maybe 12.3 is making it happen to more people? Perhaps this is why it took Apple so long to release this update?
 
This has been an on going issue from way before Monterey 12.3....
There may well be more than one issue here, but 12.3 has most definitely introduced a specific new one. My two monitors have been rock solid and trouble free for the last 18 months or so, and are now useless since 12.3. A lot of people have seen similar so 12.3 has definitely introduced a new and specific issue.
 
There may well be more than one issue here, but 12.3 has most definitely introduced a specific new one. My two monitors have been rock solid and trouble free for the last 18 months or so, and are now useless since 12.3. A lot of people have seen similar so 12.3 has definitely introduced a new and specific issue.
In a way it's good so Apple starts to give a **** and finally do something to see why the issue keeps happening.
 
New bugs, who would have thought..

My god macOS turned into an unpleasant mess.


Let me dust off my Apple tech support / PR "MAD LIBS" excuse Automator.


PFFT! PFFT!

Oh, I see enough time has not elapsed since the last time it was used for it to get dusty. :rolleyes:
 
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Updating macOS these days feels like playing Whac-A-Mole. Against your better judgement you keep doing it in the hope they fixed some bugs and comedy design choices, only to find they just added even more. Rinse and repeat. It’s kinda like an abusive relationship ?
 
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Thunderbolt Display user here (the year 2011 one). After updating my MB Air M1 to 12.3 there is only one issue: despite having a connection over ethernet the system preferences always says "no connection" over thunderbolt ethernet bridge (or whatever it's called).
So it works but thinks that it doesn‘t.
 
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Updating macOS these days feels like playing Whac-A-Mole. Against your better judgment you keep doing it in the hope they fixed some bugs and comedy design choices, only to find they just added even more. Rinse and repeat. It’s kinda like an abusive relationship ?
I used to be of the view that updating was fine and perhaps a few small issues might turn up and get fixed quickly, but I've learnt my lesson now. I won't be updating from now on until I'm 100% sure I'll still be able to do my job properly. Bugs of this size, that were reported throughout the beta process, have no place in a public release and indicate that pretty much any problem of any scale might well get released.
 
My HP display keeps cycling between idle and awake when my Mac tries to enable it. Eventually if I unplug and replug enough times it syncs up.
 
I reported this here and to Apple with the GM of 12.3 because my two usb c monitors stopped working exactly with the last update from beta to GM.
Apple did not react to my submission and many here said in the beginning it’s not happening - at least now I know I was right. Sadly. Because it worked perfectly beforehand.
 
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No problems here on a 16" MBP M1 Max on 12.3 with a 4k and a 5k2k LG screen connected via two different OWC thunderbolt hubs connected with the original LG thunderbolt cables. Always detects and always the right resolutions.
Yes thunderbolt hub works but my two portable USB C screens stopped working.
 
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