External Monitor not recognized after upgrade

Just for information Monterey is able to work with a VGA monitor with a VGA to USB-C adapter. It also works with DVI to USB-C (my current set up with my M1 iMac). My adapter is by ARKTEK and has DVI, VGA & HDMI ports.

Try the adapter in a different port

Try a different VGA cable

Try a different adapter

Try shutting down, reboot into safe mode, leave it running for a few minutes, shut down, do a normal restart.

I don't have the same problem, but apparently Apple has again broken some things under the hood related to thunderbolt/USB-C ports, specifically in Monterey 12.2 (and obviously affecting both Intel and M1 macs).

I bet your problem is caused by the same changes.

This is is a sad story for me (and many others), as the TB/USB-C has never worked fully reliably - slightly unstable since the beginning 2016, mostly broken through 2020, mostly ok and only occasionally crashing 2021 (Big Sur 11.1 fixed the worst and Monterey kept up until 12.2) and now clearly 12.2 breaks something again.

Exactly since I installed 12.2, the USB hub in my external monitor (the Apple recommended LG Ultrafine 5k, notabene) completely ceases to work after disconnecting and re-connecting the monitor. I have a very constant daily routine how I connect my MBP13-2020 every day in the morning and disconnect it in the evening. Since 12.2, I have to reboot the machine every day to make the USB connections going through the monitor's hub work again.

Today, I probed a bit further, and instead of rebooting, put the MBP to sleep, disconnected the monitor and re-connected it to the other USB-C ports:

• First the other port on the same side (left) - no improvement.
• Then, first port on the other side (right) - this made USB work again.
• Then, back to the left side - still USB is not working there
• Back to the right side - machine crashes with "intel crash log recorded"

It's just not stable and apparently Apple can't find the root cause, but just keeps applying patches here and there that fix some use cases and ruins others :-(

Can you tell us specifically how the display is attached to your mac? Some dock in between?

Maybe you used a connection that required third party "displaylink" software, and that needs to be updated to work with the new OS.

Also: does your mac not acknowledge that a display is connected, or does it say there is a display, but can't show an image in it?

You can try installing the new driver while booted in Safe Mode.

If that does not work, Please run Etrecheck and post its full report here.

Use the “additional text” button and paste the report into the text box.

From the report we should be able to give precise directions for uninstalling the old driver.

I have found that three of the USB C ports work seemlessly with an external LG monitor, but one does not (i.e. the 'lower' one on the left hand side). When I use this one, the brightness control for the external monitor does not appear, but it does if I plug into any one of the other three ports. Perhaps try swapping USB C ports???