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[MadMat <1320282@xxxxxxxxxxxxxxxxxx>]

Flashing the recent BIOS update (FBKTA5A released 2015-01-06) resolved the problem for me:
http://support.lenovo.com/downloads/ds035753
Shutdown works now with kernel 3.13.0-44.

As I did a bisect from 3.13.0-43 to 3.13.0-44 before I did the BIOS
update here's the result anyway:

01414f897d20874f6f5d7ef2f756f5bf2df526fc is the first bad commit
commit 01414f897d20874f6f5d7ef2f756f5bf2df526fc
Author: Denis Turischev <denis.turischev@xxxxxxxxxxxxxx>
Date:   Tue May 20 14:00:42 2014 +0300

    xhci: Switch only Intel Lynx Point-LP ports to EHCI on shutdown.
    
    BugLink: http://bugs.launchpad.net/bugs/1402853
    
    commit 0a939993bff117d3657108ca13b011fc0378aedb upstream.
    
    Patch "xhci: Switch Intel Lynx Point ports to EHCI on shutdown."
    commit c09ec25d3684cad74d851c0f028a495999591279 is not fully correct
    
    It switches both Lynx Point and Lynx Point-LP ports to EHCI on shutdown.
    On some Lynx Point machines it causes spurious interrupt,
    which wake the system: bugzilla.kernel.org/show_bug.cgi?id=76291
    
    On Lynx Point-LP on the contrary switching ports to EHCI seems to be
    necessary to fix these spurious interrupts.
    
    Signed-off-by: Denis Turischev <denis@xxxxxxxxxxxxxx>
    Reported-by: Wulf Richartz <wulf.richartz@xxxxxxxxx>
    Cc: Mathias Nyman <mathias.nyman@xxxxxxxxxxxxxxx>
    Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
    Signed-off-by: Kamal Mostafa <kamal@xxxxxxxxxxxxx>

:040000 040000 2017c75e797dd6fde9e00f73db85fa32eeb19775
7d11924d8262e57dab18920cf19ec4c14e93db5f M      drivers

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https://bugs.launchpad.net/bugs/1320282

Title:
  [Lenovo ThinkCentre M93p] reboots instead of shutting down

Status in linux package in Ubuntu:
  Incomplete

Bug description:
  Using `shutdown -h now` on a Lenovo ThinkCentre M93p causes it to
  reboot instea of shutting down.

  This happens on an up-to-date Ubuntu Trusty 14.04.

  ProblemType: Bug
  DistroRelease: Ubuntu 14.04
  Package: linux-image-3.13.0-24-generic 3.13.0-24.47
  ProcVersionSignature: Ubuntu 3.13.0-24.47-generic 3.13.9
  Uname: Linux 3.13.0-24-generic x86_64
  ApportVersion: 2.14.1-0ubuntu3.1
  Architecture: amd64
  AudioDevicesInUse:
   USER        PID ACCESS COMMAND
   /dev/snd/controlC1:  gioele     1975 F.... pulseaudio
   /dev/snd/controlC0:  gioele     1975 F.... pulseaudio
  CurrentDesktop: Unity
  Date: Fri May 16 17:28:30 2014
  EcryptfsInUse: Yes
  InstallationDate: Installed on 2014-05-15 (0 days ago)
  InstallationMedia: Ubuntu 14.04 LTS "Trusty Tahr" - Release amd64 (20140417)
  MachineType: LENOVO 10A7000LGE
  ProcFB: 0 inteldrmfb
  ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-3.13.0-24-generic root=UUID=f2abe8d7-641e-4e8a-917e-b909f8d55171 ro quiet splash vt.handoff=7
  RelatedPackageVersions:
   linux-restricted-modules-3.13.0-24-generic N/A
   linux-backports-modules-3.13.0-24-generic  N/A
   linux-firmware                             1.127.2
  SourcePackage: linux
  UpgradeStatus: No upgrade log present (probably fresh install)
  dmi.bios.date: 01/26/2014
  dmi.bios.vendor: LENOVO
  dmi.bios.version: FBKT72AUS
  dmi.board.name: SHARKBAY
  dmi.board.vendor: LENOVO
  dmi.board.version: 0B98401 PRO
  dmi.chassis.type: 3
  dmi.chassis.vendor: To Be Filled By O.E.M.
  dmi.chassis.version: To Be Filled By O.E.M.
  dmi.modalias: dmi:bvnLENOVO:bvrFBKT72AUS:bd01/26/2014:svnLENOVO:pn10A7000LGE:pvrThinkCentreM93p:rvnLENOVO:rnSHARKBAY:rvr0B98401PRO:cvnToBeFilledByO.E.M.:ct3:cvrToBeFilledByO.E.M.:
  dmi.product.name: 10A7000LGE
  dmi.product.version: ThinkCentre M93p
  dmi.sys.vendor: LENOVO

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