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[Alex Willmer <alex@xxxxxxxxxxxxxx>]

I'm seeing this behaviour in Ubuntu 15.10/Unity 7.3.2

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https://bugs.launchpad.net/bugs/1369293

Title:
  The desktop will not shrink back to one monitor when an external
  monitor is detached if system settings is not running

Status in Unity:
  New
Status in unity package in Ubuntu:
  Confirmed

Bug description:
  When an external HDMI monitor is attached, the desktop is automatically extended to it.
  But when the same monitor is detached, the desktop will not automatically shrink back to one monitor.
  How ever if the system settings program is running while monitor is detached, the desktop does shrink back to one monitor correctly.
  The desktop will also shrink back, if the systems settings is run at any time after detaching the monitor.

  Using Ubuntu 14.04.1 LTS

  ProblemType: Bug
  DistroRelease: Ubuntu 14.04
  Package: unity 7.2.2+14.04.20140714-0ubuntu1.1
  ProcVersionSignature: Ubuntu 3.13.0-35.62-generic 3.13.11.6
  Uname: Linux 3.13.0-35-generic x86_64
  .tmp.unity.support.test.0:
   
  ApportVersion: 2.14.1-0ubuntu3.3
  Architecture: amd64
  CompizPlugins: No value set for `/apps/compiz-1/general/screen0/options/active_plugins'
  CompositorRunning: compiz
  CompositorUnredirectDriverBlacklist: '(nouveau|Intel).*Mesa 8.0'
  CompositorUnredirectFSW: true
  CurrentDesktop: Unity
  Date: Sun Sep 14 20:16:17 2014
  DistUpgraded: Fresh install
  DistroCodename: trusty
  DistroVariant: ubuntu
  GraphicsCard:
   Intel Corporation 4th Gen Core Processor Integrated Graphics Controller [8086:0416] (rev 06) (prog-if 00 [VGA controller])
     Subsystem: Lenovo Device [17aa:5024]
  InstallationDate: Installed on 2014-05-07 (130 days ago)
  InstallationMedia: Ubuntu 14.04 LTS "Trusty Tahr" - Release amd64 (20140417)
  MachineType: LENOVO 80B6QB0
  ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-3.13.0-35-generic.efi.signed root=UUID=ced59d53-14ee-475e-a6d9-544cd0928b7e ro quiet splash vt.handoff=7
  SourcePackage: unity
  UpgradeStatus: No upgrade log present (probably fresh install)
  dmi.bios.date: 11/07/2013
  dmi.bios.vendor: LENOVO
  dmi.bios.version: J7ET57WW (2.02 )
  dmi.board.asset.tag: Not Available
  dmi.board.name: 80B6QB0
  dmi.board.vendor: LENOVO
  dmi.board.version: 31900058 STD
  dmi.chassis.asset.tag: No Asset Information
  dmi.chassis.type: 10
  dmi.chassis.vendor: LENOVO
  dmi.chassis.version: Not Available
  dmi.modalias: dmi:bvnLENOVO:bvrJ7ET57WW(2.02):bd11/07/2013:svnLENOVO:pn80B6QB0:pvrB5400:rvnLENOVO:rn80B6QB0:rvr31900058STD:cvnLENOVO:ct10:cvrNotAvailable:
  dmi.product.name: 80B6QB0
  dmi.product.version: B5400
  dmi.sys.vendor: LENOVO
  version.compiz: compiz 1:0.9.11.2+14.04.20140714-0ubuntu1
  version.ia32-libs: ia32-libs N/A
  version.libdrm2: libdrm2 2.4.52-1
  version.libgl1-mesa-dri: libgl1-mesa-dri 10.1.3-0ubuntu0.1
  version.libgl1-mesa-dri-experimental: libgl1-mesa-dri-experimental N/A
  version.libgl1-mesa-glx: libgl1-mesa-glx 10.1.3-0ubuntu0.1
  version.xserver-xorg-core: xserver-xorg-core 2:1.15.1-0ubuntu2.1
  version.xserver-xorg-input-evdev: xserver-xorg-input-evdev 1:2.8.2-1ubuntu2
  version.xserver-xorg-video-ati: xserver-xorg-video-ati 1:7.3.0-1ubuntu3.1
  version.xserver-xorg-video-intel: xserver-xorg-video-intel 2:2.99.910-0ubuntu1.1
  version.xserver-xorg-video-nouveau: xserver-xorg-video-nouveau 1:1.0.10-1ubuntu2
  xserver.bootTime: Sat Sep 13 18:25:51 2014
  xserver.configfile: default
  xserver.errors:
   
  xserver.logfile: /var/log/Xorg.0.log
  xserver.outputs:
   product id                               13394 
   vendor                                     SDC
  xserver.version: 2:1.15.1-0ubuntu2.1

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