** Description changed:

- WORKAROUND: replace gdm3 with slick-greeter + lightdm-settings + gnome-
- screensaver + numlockx(optionally)
+ WORKAROUND
+ 
+ Replace gdm3 with slick-greeter + lightdm-settings + gnome-screensaver +
+ numlockx(optionally)
+ 
  
  TL;DR
+ 
+ Correct positioning and working of multiple displays until reboot or
+ shutdown and then subsequent login from gdm3. HDMI monitor(projector)
+ goes blank and the VGA monitor only shows 'Secondary' monitor screen
+ without any user visible controls or windows as they are all being
+ painted to the now blanked 'Primary' HDMI connected display.
+ 
+ 
+ REPRODUCTION
  
  After a clean install of Ubuntu 18.10, connecting a FHD(1920x1080) LED
  monitor to the VGA port of a DELL Optiplex 390 desktop tower, connecting
  a wireless HDMI Tx/Rx(LKV HDbitT-4K) to the HDMI port with a FHD
  projector and then configuring the logical monitor layout in the
  "Displays" settings dialog, I can successfully create and use a multi
- monitor setup in my current session. However, upon a reboot or power
- cycle of the computer and a successful login from GDM(gdm3), the HDMI
- goes dark(blank?) and the VGA monitor shows as 'Secondary' monitor even
- though I set it as 'Primary' in the "Displays" dialog. The monitors.xml
- file, attached, shows the correct layout and survives the reboot without
- alteration. I am unable to see anything on the 'Primary' display, which
- has incorrectly been given to the  HDMI projector. Unseating the HDMI
- cable does not restore the VGA to 'Primary' display automatically and I
- must reboot the computer while leaving the HDMI unplugged in order to
- restore my ability to see the 'Primary' display on the VGA connection.
+ monitor setup in my current session.
+ 
+ However, after a reboot or power cycle of the computer and a successful
+ login from GDM(gdm3), the HDMI goes dark(blank?) and the VGA monitor
+ shows as 'Secondary' monitor even though I set it as 'Primary' in the
+ "Displays" dialog.
+ 
+ The monitors.xml file, attached, shows the correct layout and survives
+ the reboot without alteration.
+ 
+ I am unable to see anything on the 'Primary' display, which has
+ incorrectly been given to the HDMI projector. Unseating the HDMI cable
+ does not restore the VGA to 'Primary' display automatically and I must
+ reboot the computer while leaving the HDMI unplugged in order to restore
+ my ability to see the 'Primary' display on the VGA connection.
+ 
  Replacing GDM(gdm3) with LightDM(slick-greeter) fixes the issue and is
  repeatedly provable through multiple reboots or changes to the logical
  layout of the screens in the 'Displays' settings of gnome-control-
  center.
  
- ERRORS(syslog) = "Failed to get current display configuration state:
+ 
+ ERRORS(syslog)
+ 
+ "Failed to get current display configuration state:
  GDBus.Error:org.freedesktop.DBus.Error.NameHasNoOwner: Name
  "org.gnome.Mutter.DisplayConfig" does not exist"
  
  gnome-shell[3007]: JS ERROR: Exception in callback for signal: loaded:
  TypeError: monitor is
  
null#012_prepareStartupAnimation@resource:///org/gnome/shell/ui/layout.js:653:17#012wrapper@resource:///org/gnome/gjs/modules/_legacy.js:82:22#012_loadBackground/signalId<@resource:///org/gnome/shell/ui/layout.js:608:13#012_emit@resource:///org/gnome/gjs/modules/signals.js:128:27#012_init/id<@resource:///org/gnome/shell/ui/background.js:512:17
  
- CAUSE = clean install of Ubuntu 18.10(4.18.0-16-generic #17-Ubuntu SMP
- Fri Feb 8 00:06:57 UTC 2019 x86_64 x86_64 x86_64 GNU/Linux), attach VGA
- as primary monitor and HDMI(wireless Tx) as secondary to projector and
- then apply custom monitor positioning using g-c-c "Displays" panel.
- 
- RESULT = correct positioning and working of multiple displays until
- reboot or shutdown and then subsequent login from gdm3. HDMI
- monitor(projector) goes blank and the VGA monitor only shows 'Secondary'
- monitor screen without any user visible controls or windows as they are
- all being painted to the now blanked 'Primary' HDMI connected display.
  
  ProblemType: Bug
  DistroRelease: Ubuntu 18.10
  Package: gdm3 3.30.1-1ubuntu5.1
  ProcVersionSignature: Ubuntu 4.18.0-16.17-generic 4.18.20
  Uname: Linux 4.18.0-16-generic x86_64
  ApportVersion: 2.20.10-0ubuntu13.2
  Architecture: amd64
  CurrentDesktop: ubuntu:GNOME
  Date: Sat Mar 16 13:50:52 2019
  InstallationDate: Installed on 2019-03-07 (8 days ago)
  InstallationMedia: Ubuntu 18.10 "Cosmic Cuttlefish" - Release amd64 
(20181017.3)
  SourcePackage: gdm3
  UpgradeStatus: No upgrade log present (probably fresh install)

** Description changed:

  WORKAROUND
  
  Replace gdm3 with slick-greeter + lightdm-settings + gnome-screensaver +
  numlockx(optionally)
  
  
  TL;DR
  
  Correct positioning and working of multiple displays until reboot or
  shutdown and then subsequent login from gdm3. HDMI monitor(projector)
  goes blank and the VGA monitor only shows 'Secondary' monitor screen
  without any user visible controls or windows as they are all being
  painted to the now blanked 'Primary' HDMI connected display.
- 
  
  REPRODUCTION
  
  After a clean install of Ubuntu 18.10, connecting a FHD(1920x1080) LED
  monitor to the VGA port of a DELL Optiplex 390 desktop tower, connecting
  a wireless HDMI Tx/Rx(LKV HDbitT-4K) to the HDMI port with a FHD
  projector and then configuring the logical monitor layout in the
  "Displays" settings dialog, I can successfully create and use a multi
  monitor setup in my current session.
  
  However, after a reboot or power cycle of the computer and a successful
  login from GDM(gdm3), the HDMI goes dark(blank?) and the VGA monitor
  shows as 'Secondary' monitor even though I set it as 'Primary' in the
  "Displays" dialog.
  
  The monitors.xml file, attached, shows the correct layout and survives
  the reboot without alteration.
  
  I am unable to see anything on the 'Primary' display, which has
  incorrectly been given to the HDMI projector. Unseating the HDMI cable
  does not restore the VGA to 'Primary' display automatically and I must
  reboot the computer while leaving the HDMI unplugged in order to restore
  my ability to see the 'Primary' display on the VGA connection.
  
  Replacing GDM(gdm3) with LightDM(slick-greeter) fixes the issue and is
  repeatedly provable through multiple reboots or changes to the logical
  layout of the screens in the 'Displays' settings of gnome-control-
  center.
  
- 
  ERRORS(syslog)
  
  "Failed to get current display configuration state:
  GDBus.Error:org.freedesktop.DBus.Error.NameHasNoOwner: Name
  "org.gnome.Mutter.DisplayConfig" does not exist"
  
  gnome-shell[3007]: JS ERROR: Exception in callback for signal: loaded:
  TypeError: monitor is
  
null#012_prepareStartupAnimation@resource:///org/gnome/shell/ui/layout.js:653:17#012wrapper@resource:///org/gnome/gjs/modules/_legacy.js:82:22#012_loadBackground/signalId<@resource:///org/gnome/shell/ui/layout.js:608:13#012_emit@resource:///org/gnome/gjs/modules/signals.js:128:27#012_init/id<@resource:///org/gnome/shell/ui/background.js:512:17
- 
  
  ProblemType: Bug
  DistroRelease: Ubuntu 18.10
  Package: gdm3 3.30.1-1ubuntu5.1
  ProcVersionSignature: Ubuntu 4.18.0-16.17-generic 4.18.20
  Uname: Linux 4.18.0-16-generic x86_64
  ApportVersion: 2.20.10-0ubuntu13.2
  Architecture: amd64
  CurrentDesktop: ubuntu:GNOME
  Date: Sat Mar 16 13:50:52 2019
  InstallationDate: Installed on 2019-03-07 (8 days ago)
  InstallationMedia: Ubuntu 18.10 "Cosmic Cuttlefish" - Release amd64 
(20181017.3)
  SourcePackage: gdm3
  UpgradeStatus: No upgrade log present (probably fresh install)

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https://bugs.launchpad.net/bugs/1820423

Title:
  monitors.xml is not parsed or applied correctly during login after
  reboot or shutdown

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