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I have same model of Toshiba and I am having same problem with Linuxmint
17. Resume from suspend freezing the laptop with blank screen(no
backlight on LCD panel).

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https://bugs.launchpad.net/bugs/1290787

Title:
  [TOSHIBA Satellite U400] suspend/resume failure

Status in “linux-meta” package in Ubuntu:
  Triaged

Bug description:
  does not resume (no backlight on LCD panel, for example)
  seems to be caused by lightdm not by kernel; when 
  service lightdm stop
   bug is not reproduced by pm-suspend

  
  ProblemType: KernelOops
  DistroRelease: Ubuntu 14.04
  Package: linux-image-3.13.0-17-generic 3.13.0-17.37
  ProcVersionSignature: Ubuntu 3.13.0-17.37-generic 3.13.6
  Uname: Linux 3.13.0-17-generic i686
  Annotation: This occured during a previous suspend and prevented it from resuming properly.
  ApportVersion: 2.13.3-0ubuntu1
  Architecture: i386
  AudioDevicesInUse:
   USER        PID ACCESS COMMAND
   /dev/snd/controlC0:  katherine   1676 F.... pulseaudio
  Date: Tue Mar 11 21:08:32 2014
  ExecutablePath: /usr/share/apport/apportcheckresume
  Failure: suspend/resume
  HibernationDevice: RESUME=UUID=3dd143c7-add5-4b7b-8c26-bbd7446abb39
  InstallationDate: Installed on 2013-11-09 (121 days ago)
  InstallationMedia: Ubuntu 13.10 "Saucy Salamander" - Release i386 (20131016.1)
  InterpreterPath: /usr/bin/python3.4
  MachineType: TOSHIBA Satellite U400
  ProcCmdline: /usr/bin/python3 /usr/share/apport/apportcheckresume
  ProcEnviron:
   TERM=linux
   PATH=(custom, no user)
  ProcFB: 0 inteldrmfb
  ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-3.13.0-17-generic root=UUID=9d9d9d28-df78-475d-af30-72b9ecb189be 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-3.13.0-17-generic N/A
   linux-backports-modules-3.13.0-17-generic  N/A
   linux-firmware                             1.126
  SourcePackage: linux
  Title: [TOSHIBA Satellite U400] suspend/resume failure
  UpgradeStatus: Upgraded to trusty on 2014-03-02 (8 days ago)
  UserGroups:

  dmi.bios.date: 10/25/2010
  dmi.bios.vendor: TOSHIBA
  dmi.bios.version: V4.70
  dmi.board.name: Satellite U400
  dmi.board.vendor: TOSHIBA
  dmi.board.version: Not Applicable
  dmi.chassis.asset.tag: No Asset Tag
  dmi.chassis.type: 10
  dmi.chassis.vendor: TOSHIBA
  dmi.chassis.version: N/A
  dmi.modalias: dmi:bvnTOSHIBA:bvrV4.70:bd10/25/2010:svnTOSHIBA:pnSatelliteU400:pvrPSU40A-01M001:rvnTOSHIBA:rnSatelliteU400:rvrNotApplicable:cvnTOSHIBA:ct10:cvrN/A:
  dmi.product.name: Satellite U400
  dmi.product.version: PSU40A-01M001
  dmi.sys.vendor: TOSHIBA

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