Does Target display work with Big Sur

I wanted to know if anyone is using target display mode with Big Sur?

I have been using target display mode with an M1 Mac mini on Big Sur for over 15 months with a late 2009 27” iMac on High Sierra 10.13.6. It has been working fantastic using a usb-c to DisplayPort cable. However in the past week or two, I can’t seem to get TDM to work.

Both machines are still working fine. Have restarted both, unplugged cables, changed keyboards, etc but no luck When plugged in and pressing Command+F2, nothing happens on the iMac, when before it would blink and switch to displaying the Mac mini…

I just tried a 13” M1 MacBook Pro also on Big Sur and also no TDM. Is the iMac just getting too old or has there been a software update that may have disabled TDM?

Does Target display work with Big Sur
 
 
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