[Bug 1759950] Re: Lid-close suspend: blank screen when switching to user session

[TJ]

More search seems to point to a 2015 commit that integrated light-locker
into xfce4-power-manager. This patch in particular appears to attempt to
work with logind Lid handling too:

commit 10076da7caa49320b3e907d319a9f27ee6702969
Author: Sean Davis <bluesabre at ubuntu.com>
Date:   Sat Feb 7 11:49:31 2015 +0300

    Light Locker Integration (Bug #11488)
    
    Integrate Light Locker configuration into Xfce Power Manager. This
    allows proper settings synchronization between the two applications
    and eliminates some of the hackiness used in Light Locker Settings
    to accomplish the same effect, and streamlines similar tools into
    a single location. This depends on light-locker 1.5.1 configured
    with the GSettings backend.
    
    Signed-off-by: Eric Koegel <eric.koegel at gmail.com>

...
+/* Light Locker Integration */
+void
+xfpm_update_logind_handle_lid_switch (XfconfChannel *channel)
+{
+    gboolean lock_on_suspend = xfconf_channel_get_bool (channel, PROPERTIES_PREFIX LOCK_SCREEN_ON_SLEEP, TRUE);
+    guint lid_switch_on_ac = xfconf_channel_get_uint (channel, PROPERTIES_PREFIX LID_SWITCH_ON_AC_CFG, LID_TRIGGER_LOCK_SCREEN);
+    guint lid_switch_on_battery = xfconf_channel_get_uint (channel, PROPERTIES_PREFIX LID_SWITCH_ON_BATTERY_CFG, LID_TRIGGER_LOCK_SCRE
EN);
+
+    // logind-handle-lid-switch = true when: lock_on_suspend == true and (lid_switch_on_ac == suspend or lid_switch_on_battery == suspend)
+    xfconf_channel_set_bool (channel, PROPERTIES_PREFIX LOGIND_HANDLE_LID_SWITCH, lock_on_suspend && (lid_switch_on_ac == 1 || lid_switch_on_battery == 1));
+}
+/* END Light Locker Integration */
+


** Changed in: light-locker (Ubuntu)
       Status: Invalid => Confirmed

** Also affects: xubuntu-default-settings (Ubuntu)
   Importance: Undecided
       Status: New

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https://bugs.launchpad.net/bugs/1759950

Title:
  Lid-close suspend: blank screen when switching to user session

Status in Light-Locker:
  New
Status in Xfce4 Power Manager:
  Unknown
Status in light-locker package in Ubuntu:
  Confirmed
Status in systemd package in Ubuntu:
  New
Status in xfce4-power-manager package in Ubuntu:
  Confirmed
Status in xubuntu-default-settings package in Ubuntu:
  New

Bug description:
  I'm currently testing Xubuntu 18.04 after a do-release-upgrade from
  16.04.

  I discovered a very weird issue. When doing S3 sleep via closing the
  lid, on resume the lock screen appears, I authenticate, but as soon as
  it switches to the user session the screen goes blank - not even a
  backlight.

  Switching to other ttys works and they display correctly but the GUI
  user session remains blank.

  If the system is manually suspended (not using the lid), then resumed
  either by opening the lid or pressing the power button, the GUI user
  session is fine.

  I narrowed it down to xfce4-power-manager and discovered disabling the
  lock-screen cured the issue.

  I cloned the repository and reviewed commits between 1.7 and 1.8.
  Fortunately there aren't many. Looking at 6365683 "Proper exit status
  for light-locker-command" I suspected the change in the SetActive
  return value, and reverted it.

  After a build/install cycle I've found the system now behaves
  correctly so I think the change should be reverted.

  I've created an issue upstream for this at

  https://github.com/the-cavalry/light-locker/issues/108

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