After updating to Beta 8, I can't seem to get my external display to work. The backlight on the monitor turns on and it seems to interpret some data from the MacBook briefly displaying a flash of colors and then going black with the backlight still on. The Display is still fully function on a different Mac.
Macbook Pro 2016, display connected to external thunderbolt 3 hub.
I experienced the same problem. I spent two hours dealing with the Senior Supervisor for the New England region. At the end, nothing could be resolved, and they booked me for a session at the Apple store. However, I could not go.
Today I had some deadlines, and did not know what to do. Therefore, I noticed that it would not allow any of my dual monitors to work simultaneously (one of them always flickered).
I decided to change the frequency of the monitors from 75 Hertz to 60 Hertz. The problem has been resolved. **
The new update with Monterey OS seems to not be able to function properly with monitors that are set up with more than 60 hertz. I hope this helps somebody.
For anyone who facing the issue external display not working as usual via usb-c after upgrade to Monterey, for my case...
I've found WORKaround on Reddit : https://www.reddit.com/r/macsysadmin/comments/qgypzy/comment/hpjdnn9/?utm_source=share&utm_medium=web2x&context=3
I have the same issue with the formal release of 12.2. Was working fine through a USBC to USBC cable to my LG 4K 32 inch display. Now I have only a display through HDMI cable. Rebooting didn’t help. USBC display support gone ?
Hi guys, I had the same problem and was regretting updating my OS but what I did was search "big sur" os on google and downloaded it from the apple website (it's gonna redirect you to the app store)!