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[Siu On Chan <sochan@xxxxxxxxx>]

I used to have the same issue. Last week I updated "managed=true" in
/etc/NetworkManager/NetworkManager.conf (to fix a seemingly unrelated
wifi connection issue), and the suspend/resume problem disappears. If
you also use the Network Manager applet (which is the default on
Ubuntu), I suggest you try this fix.

(I don't know why this fix works. But it seems to do the job.)

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https://bugs.launchpad.net/bugs/1306621

Title:
  [LENOVO ThinkPad T440s] suspend/resume failure

Status in “linux” package in Ubuntu:
  Incomplete

Bug description:
  1. Description:	Ubuntu Trusty Tahr (development branch)
  Release:	14.04
  2. linux-headers-3.13.0-23-generic:
    Installed: 3.13.0-23.45
    Candidate: 3.13.0-23.45
    Version table:
   *** 3.13.0-23.45 0
          500 http://us.archive.ubuntu.com/ubuntu/ trusty/main amd64 Packages
          100 /var/lib/dpkg/status
  3. Expected it to hibernate
  4. It didn't.

  ProblemType: KernelOops
  DistroRelease: Ubuntu 14.04
  Package: linux-image-3.13.0-23-generic 3.13.0-23.45
  ProcVersionSignature: Ubuntu 3.13.0-23.45-generic 3.13.8
  Uname: Linux 3.13.0-23-generic x86_64
  Annotation: This occured during a previous suspend and prevented it from resuming properly.
  ApportVersion: 2.14.1-0ubuntu1
  Architecture: amd64
  AudioDevicesInUse:
   USER        PID ACCESS COMMAND
   /dev/snd/controlC1:  sol        2166 F.... pulseaudio
   /dev/snd/controlC0:  sol        2166 F.... pulseaudio
  Date: Fri Apr 11 09:53:08 2014
  ExecutablePath: /usr/share/apport/apportcheckresume
  Failure: suspend/resume
  HibernationDevice: RESUME=UUID=027c0786-cb7e-48db-84dd-75553c948299
  InstallationDate: Installed on 2014-02-15 (55 days ago)
  InstallationMedia: Ubuntu 14.04 LTS "Trusty Tahr" - Alpha amd64 (20140214)
  InterpreterPath: /usr/bin/python3.4
  MachineType: LENOVO 20AQCTO1WW
  ProcCmdline: /usr/bin/python3 /usr/share/apport/apportcheckresume
  ProcEnviron:
   TERM=linux
   PATH=(custom, no user)
  ProcFB: 0 inteldrmfb
  ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-3.13.0-23-generic root=UUID=3275897d-69f9-492b-a5bc-82e88c59ad0b ro quiet splash vt.handoff=7
  PulseList: Error: command ['pacmd', 'list'] failed with exit code 1: No PulseAudio daemon running, or not running as session daemon.
  RelatedPackageVersions:
   linux-restricted-modules-3.13.0-23-generic N/A
   linux-backports-modules-3.13.0-23-generic  N/A
   linux-firmware                             1.127
  SourcePackage: linux
  Title: [LENOVO 20AQCTO1WW] suspend/resume failure
  UpgradeStatus: No upgrade log present (probably fresh install)
  UserGroups:
   
  dmi.bios.date: 12/10/2013
  dmi.bios.vendor: LENOVO
  dmi.bios.version: GJET67WW (2.17 )
  dmi.board.asset.tag: Not Available
  dmi.board.name: 20AQCTO1WW
  dmi.board.vendor: LENOVO
  dmi.board.version: 0B98405 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:bvrGJET67WW(2.17):bd12/10/2013:svnLENOVO:pn20AQCTO1WW:pvrThinkPadT440s:rvnLENOVO:rn20AQCTO1WW:rvr0B98405STD:cvnLENOVO:ct10:cvrNotAvailable:
  dmi.product.name: 20AQCTO1WW
  dmi.product.version: ThinkPad T440s
  dmi.sys.vendor: LENOVO

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