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I have dual monitors on a m1 mac mini that are working fine except that when the mini wakes up from being asleep, the windows that were positioned on the secondary monitor shift over to the primary monitor.
Mac mini, macOS 11.2
Sorry that didn’t help.
I’m not sure what else to suggest at this point, except to send feedback to Apple.
https://www.apple.com/feedback/
I will say that I’ve been using dual displays for years and never had a single issue maintaining window locations in any of the earlier OS X or macOS versions up until Catalina. At this point Catalina maintains the window location during a sleep/wake cycle, but rearranges them after a restart.
To be honest, I’m holding back at Catalina for now because there are too many reports (like yours) and it is bad enough to have to rearrange things after a restart.
hcsitas makes a good point and it's actually not a bad work-around.
Go back in and check "Prevent computer from sleeping automatically when the display is off"
Then setup a Hot Corner to "Put Display(s) to Sleep"
Occasionally I find myself using the Put Displays to Sleep Hot Corner to revive a black or fuzz display in my dual display setup.
Sorry, still same behavior.
In Mission Control the first two boxes were checked and I unchecked them. I am also not using Hot Corners. The window content (one is a website and the other is a preview .png) moved from the secondary display to the primary display after the mini woke up. I had an iMac (late 2020) that did the same thing.
Now I am running a 16gb/1tb Mac Mini under 11.2.3 with the primary display using a regular USB-C cable and the secondary display using a regular HDMI cable. I have also tried using a DisplayPort (on the display) to USB-C (on the mini) instead of the regular USB-C cable on the primary display. Both displays are new Dell 32-inch LED-lit (U3219Q). This same behavior happened with two LG UltraFine 5K displays that were purchased from Apple.
I, also, have used dual monitors for years on Macs without incident. You are probably right in holding off on upgrading.
I have called Apple support repeatedly without success. This is my last hope unless I buy one of those extra wide monitors, which I may do if I can't get a solution, to what has to be a widespread problem to using dual monitors. Like why would you have dual monitors if the OS is going to make you drag the window contents from the primary display to the secondary display every time the system wakes up from sleeping? The answer is that you wouldn't.
It is macOS because I had the same problem with a 2020 iMac that was maxed out except for the SSD which was 2 tb instead of 8tb. Why does Apple proclaim that you can have multiple monitors on an iMac 2020 or a Mac Mini M1 when you can't? Yes two monitors will work, but not practically.
Disable sleep, it’s a non-feature for later Macs.
Go to > Apple > System Preferences > Mission Control and Un-check all of the boxes.
Yeah’ I’m starting to think that it’s more of a macOS issue than hardware, because it getting progressively worse with each version.
Maybe a 1st year grad student will stumble onto the solution and make some brownie points. But I'm not holding my breath, until they slow down and work out a few more bugs before moving on.
Thanks for the advice, so far it keeps all content in place. I still have the screensaver on in order to darken the displays, especially at night.
👍 You’re also free to choose a timer to switch them off, coexists happily with the “Prevent sleep”.
Thank you again for your solution. I have screen saver enabled and when I touch my mouse the Mini comes alive instantly just like my iPhone.
Thanks, Thanks, Thanks
😃👍
Window information shifts after the mini wakes up
