Comment 6 for bug 1877226

Daniel et al,

I wanted to provide an update based on the latest official mutter release as of today - 25.Mai.

The issue still exists. However, I provide the following in the event it helps to refine the underlying issue. Please let me know if there are logs that would be helpful to you or additional steps you would like me to take to help with the diagnosis.

From the desktop with dual monitors running:
1) Goto lock screen (win+l)
2) initial screen shows both monitors active
3) both screens go blac
4) external monitor goes into standby mode due to loss of signal
5) primary laptop displays turns on momentarily and a resolution change is observed based on the size of the mouse.
6) primary display goes black.
7) logging back in and going to display settings
8) system no longer uses external display and returns to single display

9) open gnome-control-center -> displays. Single Display is active

10) Attempt to select join displays

11) Error at the top of gnome-control-center: Changes cannot be applied - This could be due to hardware limitations

12) select mirror - click apply

13) a keep settings dialogue will pop-up briefly before the screen goes blank. When the screen comes back on, both screens come back on, with a new keep settings dialogue.

14) select keep settings. gnome-control-center now shows Joing Displays as being active. not/not mirror.
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As an additional note. If instead of going to the lock screen I suspend the system, which includes both monitors going into sleep mode, the above issue is not observed.