Problems using TWO identical external monitors with my 2021 16" MBP M1 Max (clamshell mode)
Just got my new 2021 16" MBP with M1 Max setup and everything was working well until I got around to my final task of hooking up my external displays! I am currently running Monterey 12.1 on my MBP.
I have two brand new and identical Dell 27" 4K (S2721Q) monitors that I am trying to hook up to my MBP and run side by side with the MBP in clamshell mode. One monitor is connected with HDMI-to-HDMI and the second with HDMI-to-USBC. My MBP is connected to power with the Apple power adapter via MagSafe.
When trying to connect displays, this is what I CAN DO:
- Mirror MBP to one display (both with lid open or in clamshell)
- Use MBP with lid open and extend to one external display
The "non-functional" monitor does in fact work because it turns on and will sometimes show a messed up video feed of my screen for a couple seconds (with the other monitor showing everything fine) before cutting out again. I also will occasionally get an error message on the monitor saying that "the current input timing is not supported by the monitor" although both monitors are identical and the other works without any issue!
I am reading on other forums that there are lots of connectivity issues for two monitors with the new MBP on Monterey but I'm sensing that my issue is a little different. I also noticed that the "Displays" section of System Preferences is not like it used to be in previous versions of OS so maybe I'm doing something wrong too...
Maybe it's fatigue or something I'm not seeing but I am stuck!! Any help, tips or insight is appreciated!
MacBook Pro 16″, macOS 12.1
