Apple Event: May 7th at 7 am PT
Why does my Mac Mini continue to switch the right and left display? seems to be whenever it goes into sleep mode and then when you wake it up, the displays are switched. Restart puts them back right again. Main display is plugged into the HDMI port, second extended display plugged into USBC adapter with HDMI port.
Mac mini, macOS 10.15
Disable Computer Sleep and only allow the Displays to Turn Off/Sleep.
Disable Computer Sleep and only allow the Displays to Turn Off/Sleep.
Just out of curiosity, are the displays identical?
Does the same thing happen if you physically switch the displays?
After doing the above and comparing the results with the normal connection, when you get "the switch", does the same display end up as the "main"? If so, there may become timing issue when waking the computer in terms of recognizing the the displays.
By default, if what is set as the main display does not immediately get recognized, it will jump to the next port and find if it recognizes that display and sets it as the main.
A fairly easy test to see if it is display dependent or not.
Also, not all I/O ports are recognized and initialized all at the same time, there is some order to the process. Perhaps waking from sleep is not the same order as reboot/power up.
Either way I would file a feedback to Apple as while you have found a workaround, it is not really the what should have been done to make it work:
Thanks for the help. This does seem to have solved the problem. Now when only the displays go to sleep and wake back up, everything stays the same.
Thanks for you help
Tony
Thanks for your help. As noted in a previous comment, changing the energy savings to not let the system go to sleep seems to have solved the problem.
Mac Mini M1 Chip - two displays
