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apport information

** Attachment added: "UdevLog.txt"
   https://bugs.launchpad.net/bugs/1436451/+attachment/4391201/+files/UdevLog.txt

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Title:
  can't power off when shutting down

Status in linux package in Ubuntu:
  Incomplete

Bug description:
  We have a dozen of HP laptop here running ubuntu and xubuntu 14.04 and 14.10 and, since few months, all of them can't power off when we try to shutdown them. Indeed, after few seconds of an apparent power off, the laptops restart.
  Please find attached, the dmesg result of one of them.
  ---
  ApportVersion: 2.14.1-0ubuntu3.7
  Architecture: amd64
  AudioDevicesInUse:
   USER        PID ACCESS COMMAND
   /dev/snd/controlC0:  slafont    2100 F.... pulseaudio
   /dev/snd/pcmC0D0p:   slafont    2100 F...m pulseaudio
   /dev/snd/timer:      slafont    2100 f.... pulseaudio
  CurrentDesktop: Unity
  DistroRelease: Ubuntu 14.04
  HibernationDevice: RESUME=UUID=d61ff2e7-d6d3-431a-823e-c1a06ff2da80
  InstallationDate: Installed on 2014-01-16 (434 days ago)
  InstallationMedia: Ubuntu 13.10 "Saucy Salamander" - Release amd64 (20131016.1)
  MachineType: Hewlett-Packard HP EliteBook Folio 9470m
  Package: linux (not installed)
  ProcFB: 0 inteldrmfb
  ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-3.13.0-48-generic root=UUID=594fc36c-3a8e-4857-a07c-a7b89e44816a ro quiet splash acpi_backlight=vendor vt.handoff=7
  ProcVersionSignature: Ubuntu 3.13.0-48.80-generic 3.13.11-ckt16
  RelatedPackageVersions:
   linux-restricted-modules-3.13.0-48-generic N/A
   linux-backports-modules-3.13.0-48-generic  N/A
   linux-firmware                             1.127.11
  Tags:  trusty
  Uname: Linux 3.13.0-48-generic x86_64
  UpgradeStatus: Upgraded to trusty on 2014-04-29 (331 days ago)
  UserGroups: adm cdrom dip lpadmin plugdev sambashare sudo
  _MarkForUpload: True
  dmi.bios.date: 10/08/2013
  dmi.bios.vendor: Hewlett-Packard
  dmi.bios.version: 68IBD Ver. F.47
  dmi.board.name: 18DF
  dmi.board.vendor: Hewlett-Packard
  dmi.board.version: KBC Version 62.17
  dmi.chassis.asset.tag: CNU3519KSP
  dmi.chassis.type: 10
  dmi.chassis.vendor: Hewlett-Packard
  dmi.modalias: dmi:bvnHewlett-Packard:bvr68IBDVer.F.47:bd10/08/2013:svnHewlett-Packard:pnHPEliteBookFolio9470m:pvrA1029D1102:rvnHewlett-Packard:rn18DF:rvrKBCVersion62.17:cvnHewlett-Packard:ct10:cvr:
  dmi.product.name: HP EliteBook Folio 9470m
  dmi.product.version: A1029D1102
  dmi.sys.vendor: Hewlett-Packard
  --- 
  ApportVersion: 2.14.1-0ubuntu3.10
  Architecture: amd64
  AudioDevicesInUse:
   USER        PID ACCESS COMMAND
   /dev/snd/controlC1:  ispa       2276 F.... pulseaudio
   /dev/snd/controlC0:  ispa       2276 F.... pulseaudio
  CurrentDesktop: Unity
  DistroRelease: Ubuntu 14.04
  HibernationDevice: RESUME=UUID=631fb6ce-a603-46a8-b22e-ab7dad7cb247
  InstallationDate: Installed on 2014-12-16 (139 days ago)
  InstallationMedia: Ubuntu 14.04.1 LTS "Trusty Tahr" - Release amd64 (20140722.2)
  MachineType: Hewlett-Packard HP EliteBook 840 G1
  Package: linux (not installed)
  ProcFB: 0 inteldrmfb
  ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-3.13.0-51-generic root=UUID=edbd9d75-ff8d-42f4-87e4-cb9e67f4717a ro quiet splash vt.handoff=7
  ProcVersionSignature: Ubuntu 3.13.0-51.84-generic 3.13.11-ckt18
  RelatedPackageVersions:
   linux-restricted-modules-3.13.0-51-generic N/A
   linux-backports-modules-3.13.0-51-generic  N/A
   linux-firmware                             1.127.11
  Tags:  trusty
  Uname: Linux 3.13.0-51-generic x86_64
  UpgradeStatus: No upgrade log present (probably fresh install)
  UserGroups: adm audio bluetooth cdrom dip fuse lpadmin plugdev sambashare sudo vboxusers
  _MarkForUpload: True
  dmi.bios.date: 03/24/2015
  dmi.bios.vendor: Hewlett-Packard
  dmi.bios.version: L71 Ver. 01.31
  dmi.board.name: 198F
  dmi.board.vendor: Hewlett-Packard
  dmi.board.version: KBC Version 15.56
  dmi.chassis.asset.tag: 5CG4481ZCY
  dmi.chassis.type: 10
  dmi.chassis.vendor: Hewlett-Packard
  dmi.modalias: dmi:bvnHewlett-Packard:bvrL71Ver.01.31:bd03/24/2015:svnHewlett-Packard:pnHPEliteBook840G1:pvrA3009DD10303:rvnHewlett-Packard:rn198F:rvrKBCVersion15.56:cvnHewlett-Packard:ct10:cvr:
  dmi.product.name: HP EliteBook 840 G1
  dmi.product.version: A3009DD10303
  dmi.sys.vendor: Hewlett-Packard

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