Comment 11 for bug 1927948

I believe I too am affected by this problem.

I have three monitors attached to my system all on the same GTX950 (GM206) adapter and after waking up from sleep the active windows move around and most annoyingly the system often struggles to 'find' all three monitors again - even though it shoes them in the display settings dialog.

Sometimes it will only see two. Sometimes finds them all but mirrors two. Meaning I have to turn monitors on and off until they play ball which can take some time for the system to recognise them all again.

The system works fine if I reboot it but on sleep it goes wrong.

Doing a xrandr shows this:

xrandr
Screen 0: minimum 8 x 8, current 7680 x 2160, maximum 16384 x 16384
DVI-I-0 disconnected (normal left inverted right x axis y axis)
DVI-I-1 disconnected (normal left inverted right x axis y axis)
HDMI-0 connected primary 3840x2160+0+0 (normal left inverted right x axis y axis) 596mm x 335mm
   3840x2160 30.00*+ 29.97 25.00 23.98
   2560x1600 59.97
   2560x1440 59.95
   1920x1080 60.00 59.94 50.00 29.97 23.98 60.00 50.04
   1680x1050 59.95
   1440x900 59.89
   1440x576 50.00
   1440x480 59.94
   1280x1024 75.02 60.02
   1280x960 60.00
   1280x720 60.00 59.94 50.00
   1152x864 75.00
   1024x768 75.03 70.07 60.00
   800x600 75.00 72.19 60.32 56.25
   720x576 50.00
   720x480 59.94
   640x480 75.00 72.81 59.94 59.93
DP-0 connected 3840x2160+3840+0 (normal left inverted right x axis y axis) 596mm x 335mm
   3840x2160 29.98*+
   2560x1600 59.97
   2560x1440 59.95
   1920x1080 60.00 59.94 50.00
   1680x1050 59.95
   1440x900 59.89
   1440x576 50.00
   1440x480 59.94
   1280x1024 60.02
   1280x960 60.00
   1280x800 59.81
   1280x720 60.00 59.94 50.00
   1024x768 60.00
   800x600 60.32 56.25
   720x576 50.00
   720x480 59.94
   640x480 59.94
   640x350 70.10
DP-1 disconnected (normal left inverted right x axis y axis)
DP-2 disconnected (normal left inverted right x axis y axis)
DP-3 disconnected (normal left inverted right x axis y axis)
DP-4 connected (normal left inverted right x axis y axis)
   3840x2160 60.00 + 30.00
   2560x1600 59.97
   2560x1440 59.95
   1920x1080 60.00 59.94 50.00
   1680x1050 59.95
   1440x900 59.89
   1440x576 50.00
   1440x480 59.94
   1280x1024 75.02 60.02
   1280x960 60.00
   1280x720 60.00 59.94 50.00
   1152x864 75.00
   1024x768 75.03 70.07 60.00
   800x600 75.00 72.19 60.32 56.25
   720x576 50.00
   720x480 59.94
   640x480 75.00 72.81 59.94 59.93
DP-5 disconnected (normal left inverted right x axis y axis)

So the system can see all monitors and I can select all three under the Screen Display settings but setting them up and applying the changes doesn't result in them all turning off as expected until you've done it numerous times...

If I work out the pattern I will update this.

Am running Ubuntu 22.04.1 LTS and Gnome 42.4.

Happy to run tests or help replicate.