Public bug reported:

I have a Dell XPS 13 9380 laptop with Type-C dock. There are two
external monitors (DisplayPort) and USB mouse attached to the doc.

Normally I disconnect the dock cable from the laptop, close the laptop lid and 
laptop suspends.
However, sometimes it doesn't suspend.
I can see the 'Lid closed.' message in systemd-logind log which is normally 
followed by a sleep.
Once this happens, laptop no longer suspends on lid close until I restart Gnome 
session.
Also, if I lock it, the screen goes black but the backlight does not turn off.

I can put computer to a sleep from Gnome menu.

I'm not sure if it's issue is specific to Type-C dock though. It happens
rarely, maybe 1 of 20 times.

It appears like gsd does not detect monitors disconnect event in some
cases:

abram@abram-laptop:~$ systemd-inhibit --list --mode=block 
WHO   UID  USER  PID     COMM           WHAT                                    
                 WHY                                                         
MODE 
gdm   123  gdm   1977595 gsd-power      handle-lid-switch                       
                 External monitor attached or configuration changed recently 
block
gdm   123  gdm   1977593 gsd-media-keys 
handle-power-key:handle-suspend-key:handle-hibernate-key GNOME handling 
keypresses                                   block
abram 1000 abram 779130  gsd-media-keys 
handle-power-key:handle-suspend-key:handle-hibernate-key GNOME handling 
keypresses                                   block

3 inhibitors listed.

I've also seen a similar issue mentioned at askubuntu: 
https://askubuntu.com/questions/1196871/gnome-supend-on-laptop-lid-close-no-longer-works-since-19-10-upgrade
The accepted answer involves killing gsd-power but that's more like a 
workaround than a fix; the same presumably happens when Gnome session is 
restarted.

ProblemType: Bug
DistroRelease: Ubuntu 20.04
Package: gnome-settings-daemon 3.36.1-0ubuntu1
ProcVersionSignature: Ubuntu 5.4.0-33.37-generic 5.4.34
Uname: Linux 5.4.0-33-generic x86_64
ApportVersion: 2.20.11-0ubuntu27.2
Architecture: amd64
CasperMD5CheckResult: skip
CurrentDesktop: GNOME
Date: Fri Jun 12 19:19:35 2020
InstallationDate: Installed on 2019-04-17 (421 days ago)
InstallationMedia: Ubuntu 19.04 "Disco Dingo" - Alpha amd64 (20190326.2)
SourcePackage: gnome-settings-daemon
UpgradeStatus: Upgraded to focal on 2020-04-02 (70 days ago)

** Affects: gnome-settings-daemon (Ubuntu)
     Importance: Undecided
         Status: New


** Tags: amd64 apport-bug focal

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https://bugs.launchpad.net/bugs/1883292

Title:
  Laptop not suspending on lid close after external monitors
  disconnected

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