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[Rocko <rockorequin@xxxxxxxxxxx>]

I notice that if I unplug the external monitor first and then close the
lid, the laptop *does* suspend.

I tried uncommenting HandleLidSwitch=suspend in /etc/systemd/logind.conf
in case it is a systemd issue, but this didn't make any difference (even
after a reboot), so perhaps this is a bug in systemd.

There also appear to be some new dconf settings that affect the suspend
behaviour:

org.gnome.settings-daemon.plugins.xrandr: this is set to 'follow-lid' in
my setup, which makes xrandr do a 'dock' when the lid is closed (ie to
switch off the internal monitor, which is exactly the description in
this bug). If I set it to 'do-nothing', closing the lid either does
nothing (as expected) or engages the lock screen.

There's also a setting at org.gnome.settings-daemon.plugins.power called
lid-close-suspend-with-external-monitor that describes itself with:

        With no external monitors plugged in, closing a laptop's lid
	will suspend the machine (as set by the lid-close-battery-action and
	lid-close-ac-action keys).  By default, however, closing the lid when
	an external monitor is present will not suspend the machine, so that one can keep
	working on that monitor (e.g. for docking stations or media viewers).  Set this
	key to False to keep the default behavior, or to True to suspend the laptop whenever the
	lid is closed and regardless of external monitors.

It is set to false by default, and its description matches the behaviour
described in this bug report, so the bug might be that the power
settings GUI (ie where you set the suspend behaviour) does not include
the toggle for this setting.

However, note that suspend still does not work even if you set lid-
close-suspend-with-external-monitor to true, so I guess there is an
additional bug in gnome that prevents the laptop from suspending.

-- 
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https://bugs.launchpad.net/bugs/1398771

Title:
  Laptop screen turned off instead of suspending on lid close

Status in unity-settings-daemon package in Ubuntu:
  Confirmed

Bug description:
  For some time now my laptop did not suspend on lid close, I noticed
  recently that it actually only happened when I had my external screen
  connected, and what was actually happening is that the internal screen
  got disabled instead of the laptop going to sleep.

  Attached find a --debug log from a close/open cycle.

  ProblemType: Bug
  DistroRelease: Ubuntu 15.04
  Package: unity-settings-daemon 15.04.1+15.04.20141128-0ubuntu1
  Uname: Linux 3.18.0-031800rc4-generic x86_64
  ApportVersion: 2.14.7-0ubuntu10
  Architecture: amd64
  CurrentDesktop: Unity
  Date: Wed Dec  3 11:44:15 2014
  SourcePackage: unity-settings-daemon
  UpgradeStatus: No upgrade log present (probably fresh install)

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