Comment 2 for bug 2015345

When problems start to occur, sometimes the "working" screen goes blank and forces me to log back in, as if the screen was locked.

After disabling wayland in /etc/gdm3/custom.conf and rebooting, xrandr shows the "missing" screen, and I can manually force the system to use both screens using
xrandr --output eDP-1 --auto --left-of DP-1-1
and at present that seems to be the only reliable manner of getting both monitors to work again.

Even after that, the settings app does not show there being multiple monitors in use.

I tried the 6.2.10 mainline kernel using "ubuntu-mainline-kernel.sh -i v6.2.10" after installing ubuntu-mainline-kernel.sh from https://raw.githubusercontent.com/pimlie/ubuntu-mainline-kernel.sh/master/ubuntu-mainline-kernel.sh
There was no improvement with the newer kernel.

=======
Before manual command:

xrandr
Screen 0: minimum 320 x 200, current 1920 x 1080, maximum 16384 x 16384
eDP-1 connected (normal left inverted right x axis y axis)
   1920x1080 60.05 + 60.05
   1680x1050 60.05
   1400x1050 60.05
   1600x900 60.05
   1280x1024 60.05
   1400x900 60.05
   1280x960 60.05
   1440x810 60.05
   1368x768 60.05
   1280x800 60.05
   1280x720 60.05
   1024x768 60.05
   960x720 60.05
   928x696 60.05
   896x672 60.05
   1024x576 60.05
   960x600 60.05
   960x540 60.05
   800x600 60.05
   840x525 60.05
   864x486 60.05
   700x525 60.05
   800x450 60.05
   640x512 60.05
   700x450 60.05
   640x480 60.05
   720x405 60.05
   684x384 60.05
   640x360 60.05
   512x384 60.05
   512x288 60.05
   480x270 60.05
   400x300 60.05
   432x243 60.05
   320x240 60.05
   360x202 60.05
   320x180 60.05
HDMI-1 disconnected (normal left inverted right x axis y axis)
DP-1 disconnected (normal left inverted right x axis y axis)
HDMI-2 disconnected (normal left inverted right x axis y axis)
DP-1-1 connected primary 1920x1080+0+0 (normal left inverted right x axis y axis) 600mm x 340mm
   1920x1080 60.00*+ 50.00 59.94
   1680x1050 59.95
   1400x1050 59.98
   1600x900 60.00
   1280x1024 60.02
   1440x900 59.89
   1280x800 59.81
   1280x720 60.00 50.00 59.94
   1024x768 60.00
   800x600 60.32
   720x576 50.00
   720x480 60.00 59.94
   640x480 60.00 59.94
DP-1-2 disconnected (normal left inverted right x axis y axis)
DP-1-3 disconnected (normal left inverted right x axis y axis)

==============
After manual command:

xrandr
Screen 0: minimum 320 x 200, current 3840 x 1080, maximum 16384 x 16384
eDP-1 connected 1920x1080+0+0 (normal left inverted right x axis y axis) 309mm x 174mm
   1920x1080 60.05*+ 60.05
   1680x1050 60.05
   1400x1050 60.05
   1600x900 60.05
   1280x1024 60.05
   1400x900 60.05
   1280x960 60.05
   1440x810 60.05
   1368x768 60.05
   1280x800 60.05
   1280x720 60.05
   1024x768 60.05
   960x720 60.05
   928x696 60.05
   896x672 60.05
   1024x576 60.05
   960x600 60.05
   960x540 60.05
   800x600 60.05
   840x525 60.05
   864x486 60.05
   700x525 60.05
   800x450 60.05
   640x512 60.05
   700x450 60.05
   640x480 60.05
   720x405 60.05
   684x384 60.05
   640x360 60.05
   512x384 60.05
   512x288 60.05
   480x270 60.05
   400x300 60.05
   432x243 60.05
   320x240 60.05
   360x202 60.05
   320x180 60.05
HDMI-1 disconnected (normal left inverted right x axis y axis)
DP-1 disconnected (normal left inverted right x axis y axis)
HDMI-2 disconnected (normal left inverted right x axis y axis)
DP-1-1 connected primary 1920x1080+1920+0 (normal left inverted right x axis y axis) 600mm x 340mm
   1920x1080 60.00*+ 50.00 59.94
   1680x1050 59.95
   1400x1050 59.98
   1600x900 60.00
   1280x1024 60.02
   1440x900 59.89
   1280x800 59.81
   1280x720 60.00 50.00 59.94
   1024x768 60.00
   800x600 60.32
   720x576 50.00
   720x480 60.00 59.94
   640x480 60.00 59.94
DP-1-2 disconnected (normal left inverted right x axis y axis)
DP-1-3 disconnected (normal left inverted right x axis y axis)