Hi guys,
I'm so happy about finding this thread. I have a MacBookPro with M1 and have a similar problem. My Mac is working fine. But when I shutdown the Mac in the evening and restart it a the next morning I only get the beachball. So, I have to hard reset the Mac, then restart, then shutdown by command and reboot again. After that it is working for a day.
And, I also have LG monitors. I have two LG monitors and on both monitors I have the same issue. But I do not use a external keyboard.
Both of my monitors are using 60 Hz (sorry, I do not have a monitor from different manufacturer, so I cannot check this).
I also have the above setting NOT set in the preferences, I now enabled it.
One more aspect - I also use Splashdot, I read one of you guys also use it. Might this be the software which is playing a role in this issue?
I will be back to report my experiences with setting this preferences parameter.