> This most trivial (untested) patch

I now built package with this test and it correctly suspends with
external monitor connected.

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https://bugs.launchpad.net/bugs/1902911

Title:
  GNOME desktop does not suspend on lid close with HDMI TV connected

Status in gnome-settings-daemon package in Ubuntu:
  New

Bug description:
  Ubuntu 20.04 with all current updates, GNOME/Wayland desktop, Dell
  Latitude E5450 notebook.

  I have external TV connected via HDMI and I want notebook to suspend
  when I close lid even if TV is connected. This does not work. Even
  though logind is configured to suspend in this case:

  $ cat /etc/systemd/logind.conf.d/allow-suspend-with-hdmi.conf 
  [Login]
  HandleLidSwitchDocked=suspend
  $ 

  gnome-settings-daemon starts inhibitor as soon as it detects external
  monitor:

  WHO                          UID  USER PID   COMM            WHAT             
                                        WHY                                     
                    MODE 
  bor                          1001 bor  96600 gsd-power       
handle-lid-switch                                        External monitor 
attached or configuration changed recently block

  so sytemd-logind does not initiate suspend, but there is also no code
  in gnome-settings-daemon itself to handle lid close (as it completely
  relies on systemd-logind today).

  Ubuntu package includes patch ubuntu-lid-close-suspend.patch that
  restores gsettings keys, but as there is no code to actually *use*
  these keys patch has no effect:

  $ gsettings list-recursively org.gnome.settings-daemon.plugins.power | grep 
-w lid
  org.gnome.settings-daemon.plugins.power lid-close-ac-action 'suspend'
  org.gnome.settings-daemon.plugins.power 
lid-close-suspend-with-external-monitor true
  org.gnome.settings-daemon.plugins.power lid-close-battery-action 'suspend'
  $ 

  This most trivial (untested) patch to use this settings seems to be:

  diff --git a/plugins/power/gsd-power-manager.c 
b/plugins/power/gsd-power-manager.c
  index c7a16e8d..9b7a99b5 100644
  --- a/plugins/power/gsd-power-manager.c
  +++ b/plugins/power/gsd-power-manager.c
  @@ -1196,7 +1196,7 @@ upower_kbd_toggle (GsdPowerManager *manager,
   static gboolean
   suspend_on_lid_close (GsdPowerManager *manager)
   {
  -        return !external_monitor_is_connected (manager->rr_screen);
  +        return g_settings_get_boolean (manager->settings, 
"lid-close-suspend-with-external-monitor") || !external_monitor_is_connected 
(manager->rr_screen);
   }
   
   static gboolean

  ProblemType: Bug
  DistroRelease: Ubuntu 20.04
  Package: gnome-settings-daemon 3.36.1-0ubuntu1
  ProcVersionSignature: Ubuntu 5.8.0-25.26~20.04.1-generic 5.8.14
  Uname: Linux 5.8.0-25-generic x86_64
  ApportVersion: 2.20.11-0ubuntu27.10
  Architecture: amd64
  CasperMD5CheckResult: skip
  CurrentDesktop: ubuntu:GNOME
  Date: Wed Nov  4 18:43:56 2020
  DistributionChannelDescriptor:
   # This is a distribution channel descriptor
   # For more information see 
http://wiki.ubuntu.com/DistributionChannelDescriptor
   canonical-oem-somerville-trusty-amd64-20140620-0
  InstallationDate: Installed on 2015-07-02 (1952 days ago)
  InstallationMedia: Ubuntu 14.04 "Trusty" - Build amd64 LIVE Binary 
20140620-04:25
  ProcEnviron:
   TERM=xterm-256color
   PATH=(custom, no user)
   XDG_RUNTIME_DIR=<set>
   LANG=ru_RU.UTF-8
   SHELL=/bin/bash
  SourcePackage: gnome-settings-daemon
  UpgradeStatus: Upgraded to focal on 2020-10-03 (32 days ago)

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