Yet more results changing the target once again!
I was able to reproduce the issue whilst using sddm which tends to
suggest lightdm may not be the cause.
I also managed to prove (not sure why this did not occur to me before
now!) that the DPMS state is being set 'off' when switching to the GUI
tty and 'on' when switching away.
In a console TTY I had:
$ while true; do grep .
/sys/class/drm/card0-LVDS-1/{dpms,enabled,status}; sleep 1; done
And then switched to the GUI and closed the lid. After resuming from
suspend and unlocking the GUI blanked. Switching to the console TTY
showed that whilst on the GUI TTY
dpms=off
which changes to
dpms=on
when switching away from it.
This tends to point pack towards xfce4-power-manager and upower since,
as I currently understand it, they specifically 'do' DPMS 'stuff'.
Certainly x-p-m has a lot of DPMS handling code and user-config
properties exposed.
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https://bugs.launchpad.net/bugs/1759950
Title:
Lid-close suspend: blank screen when switching to user session
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