In terms of the kernel version I don't know exactly as I do not suspend
very often, but I never saw the problem before upgrade from Utopic.  I
have just tried booting into a live Utopic image which was the release
candidate on 17th Oct 14 and uname shows 3.16.0-22 and it suspends ok
there.  Perhaps it is not purely a kernel issue.

** Changed in: xorg (Ubuntu)
       Status: Incomplete => New

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https://bugs.launchpad.net/bugs/1415958

Title:
  Laptop + external display does not suspend on lid close

Status in xorg package in Ubuntu:
  New

Bug description:
  Since update to Vivid, laptop does not suspend on lid close if an external 
monitor is connected, even though suspend is selected in the power settings for 
lid close. The display flashes and apps move to external display. Syslog shows 
no attempt to suspend. On Utopic it suspended ok with external monitor. In the 
logs the lid was closed on Jan 29 15:04:00 and opened at 15:04:30. There are 
messages in syslog at that time but I suspect they may be a different issue:
  i915 0000:00:02.0: BAR 6: [??? 0x00000000 flags 0x2] has bogus alignment

  WORKAROUND: Suspend via the menu.

  WORKAROUND: Disconnect external monitor first.

  ProblemType: Bug
  DistroRelease: Ubuntu 15.04
  Package: xorg 1:7.7+7ubuntu2
  ProcVersionSignature: Ubuntu 3.18.0-11.12-generic 3.18.3
  Uname: Linux 3.18.0-11-generic i686
  .tmp.unity.support.test.0:

  ApportVersion: 2.15.1-0ubuntu4
  Architecture: i386
  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: Thu Jan 29 15:04:52 2015
  DistUpgraded: Fresh install
  DistroCodename: vivid
  DistroVariant: ubuntu
  ExtraDebuggingInterest: Yes
  GraphicsCard:
   Intel Corporation 4th Gen Core Processor Integrated Graphics Controller 
[8086:0416] (rev 06) (prog-if 00 [VGA controller])
     Subsystem: Fujitsu Limited. Device [10cf:17a9]
  InstallationDate: Installed on 2014-12-27 (33 days ago)
  InstallationMedia: Ubuntu 15.04 "Vivid Vervet" - Alpha i386 (20141227)
  MachineType: FUJITSU LIFEBOOK A544
  ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-3.18.0-11-generic 
root=UUID=09bfc4b3-c846-47be-ba86-c3db22bcff54 ro quiet splash vt.handoff=7
  SourcePackage: xorg
  UpgradeStatus: No upgrade log present (probably fresh install)
  dmi.bios.date: 05/09/2014
  dmi.bios.vendor: FUJITSU // Phoenix Technologies Ltd.
  dmi.bios.version: Version 1.17
  dmi.board.name: FJNBB35
  dmi.board.vendor: FUJITSU
  dmi.chassis.type: 10
  dmi.chassis.vendor: FUJITSU
  dmi.modalias: 
dmi:bvnFUJITSU//PhoenixTechnologiesLtd.:bvrVersion1.17:bd05/09/2014:svnFUJITSU:pnLIFEBOOKA544:pvr:rvnFUJITSU:rnFJNBB35:rvr:cvnFUJITSU:ct10:cvr:
  dmi.product.name: LIFEBOOK A544
  dmi.sys.vendor: FUJITSU
  version.compiz: compiz 1:0.9.12.0+15.04.20141219-0ubuntu1
  version.libdrm2: libdrm2 2.4.58-2
  version.libgl1-mesa-dri: libgl1-mesa-dri 10.4.2-2ubuntu1
  version.libgl1-mesa-dri-experimental: libgl1-mesa-dri-experimental N/A
  version.libgl1-mesa-glx: libgl1-mesa-glx 10.4.2-2ubuntu1
  version.xserver-xorg-core: xserver-xorg-core 2:1.16.2.901-1ubuntu3
  version.xserver-xorg-input-evdev: xserver-xorg-input-evdev 1:2.9.0-1ubuntu2
  version.xserver-xorg-video-ati: xserver-xorg-video-ati 1:7.4.0-2ubuntu2
  version.xserver-xorg-video-intel: xserver-xorg-video-intel 
2:2.99.917-1~exp1ubuntu2
  version.xserver-xorg-video-nouveau: xserver-xorg-video-nouveau 
1:1.0.11-1ubuntu2
  xserver.bootTime: Thu Jan 29 15:00:08 2015
  xserver.configfile: default
  xserver.errors:

  xserver.logfile: /var/log/Xorg.0.log
  xserver.outputs:
   product id                               13890
   vendor                                     SEC
  xserver.version: 2:1.16.2.901-1ubuntu3

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