Tested with the 19.10 daily (2019-06-22) amd64 build and the problem
affects the live environment too.
Set x-p-m Lid Close action on battery to suspend and the 2nd lid close
cycle results in DPMS=off when the GUI TTY is active.
As in comment #15 I monitored the LVDS DPMS state whilst switching
between TTYs:
$ while true; do grep .
/sys/class/drm/card0-LVDS-1/{dpms,enabled,status}; sleep 1; done
This also confirms the locker isn't implicated since, as I understand
it, it is disabled in the live environment (and I saw no password
challenge dialog even when specifically pressing the 'Lock' icon on the
menu.)
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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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