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[Sean Brisbane <1299821@xxxxxxxxxxxxxxxxxx>]

Unrelated to this bug, I have also discovered that alt+sysreq RIE are
all disabled for the mainline and trusty 'head' kernel
(3.13.0-20-generic) by default:

cat /proc/sys/kernel/sysrq
176

Mentioned here:
https://bugs.launchpad.net/ubuntu/+source/procps/+bug/1025467

Also, if I suspend while the focus is on tty1 ( a text console ) rather
than tty7 (GUI), the text console operates fine when I resume from pm-
suspend until I switch back to tty7.  At that point the system locks up
again.

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https://bugs.launchpad.net/bugs/1299821

Title:
  [LENOVO 4236SGS] suspend/resume failure

Status in “linux” package in Ubuntu:
  Confirmed

Bug description:
  After closing my laptop lid and allowing it to suspend to RAM, the
  system would not resume properly.

  The visuals on the GUI returned to its previous state without any
  artifacts, however the mouse pointer was not working.  I used a
  trackpad and a nipple on my T420 laptop. I left it in this state and
  the mouse was still dead after about 3-4 minutes.  After coming back
  from making a cup of tea the mouse moved but did not interact with any
  GUI elements.

  I have seens some success on previous ubuntu versions if I did a tty
  switch.  This did not work (ctrl+alt+F1), the Unity GUI stayed
  visible.  I then tried the sysreq triggers alt+sysreq RE and lost the
  mouse pointer again, but the gui stayed visible.  I needed to go
  through the whole alt+sysreq+reisub to make the machine reboot.

  ProblemType: KernelOops
  DistroRelease: Ubuntu 14.04
  Package: linux-image-3.13.0-20-generic 3.13.0-20.42 [modified: boot/vmlinuz-3.13.0-20-generic]
  ProcVersionSignature: Ubuntu 3.13.0-20.42-generic 3.13.7
  Uname: Linux 3.13.0-20-generic x86_64
  Annotation: This occured during a previous suspend and prevented it from resuming properly.
  ApportVersion: 2.13.3-0ubuntu1
  Architecture: amd64
  AudioDevicesInUse:
   USER        PID ACCESS COMMAND
   /dev/snd/controlC1:  brisbanel   2213 F.... pulseaudio
   /dev/snd/controlC0:  brisbanel   2213 F.... pulseaudio
  Date: Sun Mar 30 08:40:36 2014
  ExecutablePath: /usr/share/apport/apportcheckresume
  Failure: suspend/resume
  HibernationDevice: RESUME=UUID=43d2d849-d65f-425b-b137-55a43d22eb21
  InstallationDate: Installed on 2014-03-29 (0 days ago)
  InstallationMedia: Ubuntu 14.04 LTS "Trusty Tahr" - Daily amd64 (20140329)
  InterpreterPath: /usr/bin/python3.4
  MachineType: LENOVO 4236SGS
  ProcCmdline: /usr/bin/python3 /usr/share/apport/apportcheckresume
  ProcEnviron:
   TERM=linux
   PATH=(custom, no user)
  ProcFB: 0 nouveaufb
  ProcKernelCmdLine: BOOT_IMAGE=/vmlinuz-3.13.0-20-generic root=UUID=c37c49b4-8185-458c-91b7-c6e5d5f103e8 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-3.13.0-20-generic N/A
   linux-backports-modules-3.13.0-20-generic  N/A
   linux-firmware                             1.126
  SourcePackage: linux
  Title: [LENOVO 4236SGS] suspend/resume failure
  UpgradeStatus: No upgrade log present (probably fresh install)
  UserGroups:
   
  dmi.bios.date: 11/28/2011
  dmi.bios.vendor: LENOVO
  dmi.bios.version: 83ET67WW (1.37 )
  dmi.board.asset.tag: Not Available
  dmi.board.name: 4236SGS
  dmi.board.vendor: LENOVO
  dmi.board.version: Not Available
  dmi.chassis.asset.tag: No Asset Information
  dmi.chassis.type: 10
  dmi.chassis.vendor: LENOVO
  dmi.chassis.version: Not Available
  dmi.modalias: dmi:bvnLENOVO:bvr83ET67WW(1.37):bd11/28/2011:svnLENOVO:pn4236SGS:pvrThinkPadT420:rvnLENOVO:rn4236SGS:rvrNotAvailable:cvnLENOVO:ct10:cvrNotAvailable:
  dmi.product.name: 4236SGS
  dmi.product.version: ThinkPad T420
  dmi.sys.vendor: LENOVO

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