Ventura breaks monitor detection?

Apple tech knew the problem as soon as I said TB dock and external display.... so I think it's quite well known to Apple. I had to drop back to one DP on dock + HDMI, no USB-C. The DP wont work if the USB-C (TB) display is connected either, so it seems if there is any USB-C monitor connected it also brings down the others.....

I have the same problem. I have a workaround that's not pretty but works.

I start activity monitor > force stop the proces called "Windowserver" > it will log me out > after i log-in again, i have all the normal resolutions back in display settings. I have to do this every day, but it's the only thing that works for now.

After trying all sorts of things, I realized I haven't turned off and on my external monitor and that did the trick!

Go to Displaylink's website and download the latest Displaylink drivers and install. This will fix the issue. Dell adapters depend on Displaylink drivers to function properly. Most people don't realize all these adapters are dependent on the Displaylink software running properly. Upgrades often break the drivers are require a reinstall. Install Displaylink drivers and the issue will be resolved.

Correct this one uni USB C to DisplayPort Cable for Home Office (4K@60Hz, 2K@165Hz), Sturdy Aluminum USB Type-C to DisplayPort Cable [Thunderbolt 3 Compatible] for MacBook Pro, MacBook Air/iPad Pro 2020, XPS https://a.co/d/g3PBOkB

specifically.

So guys, I have th Samsung ultra wide 34inch that supports PIP. The supported ports are DisplayPort, USB-C, and HDMI.

I have an Intel 2019 and 2021 M1 macbook. both are using Ventura 13.1 for use of universal control. Before 13.1 upgrade, my setup using usbc and DisplayPort worked seamlessly in clamshell mode. After the upgrade, things got wonky. From a technical perspective, I can say that it seems the DisplayPort and usbc port is sending out the wrong signals to the external monitor for sleeping and in clamshell mode and can even possibly be even “breaking” protocol as one case, I’ve disconnected the dp connection and my monitor completely shuts off and doesn’t turn back on unless I either unplug my monitor OR! Plug the dp back in! The usbc seems to have the most critical problem with the Intel macbook as another case is that that display won’t even show up on external monitor but the external monitor CAN detect the usbc connection.

I’ve since settled with using the hdmi port for now as that has taken away all of my headache and trail and error that wasted 2 days of my vacation.

so my setup now is that the dp connects to M1 as there’s less problems there and my Intel connects to hdmi. When all fails hdmi seems really reliable.

Think I’ll revert.

You have to completely wipe your machine to do that. I downloaded Monterey and cannot rollback. Have to be a re-image

Monitor detection is definitely buggy. I am facing even worse problems ... External display issues over and over aga… - Apple Community

I am not able to connect external monitor after the update. When I plug the usb-c cable the whole system is laggy and kernel_task and window server process are taking too much cpu and the system i stuck forever until I unplug the monitor cable.

Same here. I have a triple 24" setup that worked great before the update, not I can only get one monitor to work. I am using the ELECIFE MacBook Pro Triple Monitor Docking Station, 16in1 USB-C Docking Station with three ASUS 24" monitors.

Is there a fix coming for this Ventura upgrade?

Ditto. Upgraded to Ventura 13.1 today but still no joy. USB-C genuine Apple adapter to HDMI cable, to external monitor. Worked fine under previous OS; now display is not detected at all despite all the usual fixes (reset NVRAM & SMC, reboot, safe mode, plug/unplug, try all ports - nothing). Still turning knobs.

Eish indeed very frustrating, my MacBook-pro is very tiny would work better on 2nd screen curious what seems to be the way forward , apple should apply bug-fix asap don’t want to rollback to outdated Monterey

A fix would be fabulous, but they don’t want to own this. I’m told it isn’t a thing and I’m speculating and starting rumors which is why the keep removing my post.

i’m not willing to completely re-image my machine wiping out all my software and setting to fix something they released without testing. Desperately looking for a fix, just not that.

Glad that it worked for you, but unfortunately didn't work for me.

With more troubleshooting, It appears to be only the external HDMI detection that's an issue; an external USB-C monitor I tested is working fine. But couldn't detect the external HDMI even when holding down the Option key in the Displays control panel to toggle the "Detect Displays" button.