Mac: 3 monitor setup: My desktop set keep switching places between monitors

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I have a MacBook pro MacBook Pro (Retina, 15-inch, Mid 2014)

And have 2 External Monitors ASUS VS247 Display connected via thunderbolt.

On each monitor, I have multiple Desktops/Spaces open.


When I wake my mac from sleep, sometimes, it switches the recognition of the monitors and all the Desktops/Spaces from Monitor2 are now on Monitor3 and all Desktops/Spaces from Monitor3 are on Monitor2.

The main monitor (the one on the laptop) always stays the same.

This happens on an average once every month. I was unable to find a specific cause for this to happen.

I have my thunderbolt cables and ports color-coded. So, I am definitely not switching the cables around.

More info:

This is how my mission control settings look like.

[NO] Automatically rearrange spaces based on most recent use?
[Yes] When switching to an application, switch to a Space with open windows for the application.
[No] Group windows by application.
[Yes] Displays have separate Spaces.

Does anyone else have the same issue? If so is there a fix?

Best Answer

I "solved" this problem using If I connect my hub and the monitors are incorrect, instead of having to rotate screens or reconnect cables, I can now run a script (via a hotkey) to resolve this.

First, make sure your monitors are in the correct configuration. Then install displayplacer and run it.

brew tap jakehilborn/jakehilborn && brew install displayplacer
displayplacer list

At the bottom of the output you'll see that it generates the command which will place your monitors back into the current configuration. Example:

displayplacer "id:C00DE6B5-2BF1-D707-8452-14BD6BFAAC84 res:1920x1080 hz:60 color_depth:8 scaling:off origin:(0,0) degree:0" "id:D0823E00-B252-0F5C-DE87-D142F95D0CB4 res:1680x1050 color_depth:8 scaling:on origin:(-1680,0) degree:0" "id:1A13BBCA-7176-912E-4048-7E7E22D786C2 res:1080x1920 hz:60 color_depth:8 scaling:off origin:(1920,-386) degree:90"

I then created a service/action and set a keyboard shortcut for this item. Now a quick keystroke will resolve the issue.

More info: The answer by Dan is the root of this problem for me. I have two identical monitors, both being connected to a hub via Displayport. That hub is connected to my mac via one USB-C connection. Randomly, the dock will load the settings in a different order which causes this issue. Since my 3rd monitor is rotated, this makes two screens now improperly rotated.

For months I have been disconnecting both DisplayPort connections on the hub, and then reconnecting in the reverse order. This solves the problem, but it was really annoying.

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