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[krusade <1266005@xxxxxxxxxxxxxxxxxx>]

The behavior I'm encountering seems to be similar to the one reported in a kernel bug from 2008:
https://bugs.launchpad.net/ubuntu/+source/linux/+bug/234700

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https://bugs.launchpad.net/bugs/1266005

Title:
  Computer started to reboot instead of shutdown after kernel update

Status in “linux” package in Ubuntu:
  Confirmed

Bug description:
  
  This was originally a question, I've been suggested to file a bug. I'll try to give a technical account of what is happening but I am not familiar with developing software.

  I am running Ubuntu 12.04 64bit with Gnome 3 on a dual boot machine.
  Upon shutdown (from the menu) the computer stops, including all the
  fans but starts by itself after about 2 seconds.

  This started  happening after an update that changed the kernel from
  3.8.0-33 to 3.8.0-34. I can choose a previous kernel from the GRUB
  menu at startup and boot with 3.8.0-33 and this way I can shutdown the
  computer. I can also shutdown the computer with no problem when I boot
  into Windows. Today there was another kernel update, which I did and
  can report that the unwanted behavior continues also with 3.8.0-35.

  Things I've done:

  - Checked the BIOS for settings that might prevent computer from
  powering off. No "wake on LAN" or other settings like this are active.
  The mainboard is based on an Intel H87 chipset.

  - Added "acpi=noirq" to GRUB - no effect. If it brings any relevance: I recently upgraded my video card and the issue persists with the new card.
  ---
  AlsaVersion: Advanced Linux Sound Architecture Driver Version k3.8.0-34-generic.
  ApportVersion: 2.0.1-0ubuntu17.6
  Architecture: amd64
  AudioDevicesInUse:
   USER        PID ACCESS COMMAND
   /dev/snd/controlC1:  jeffrey    1940 F.... pulseaudio
   /dev/snd/controlC0:  jeffrey    1940 F.... pulseaudio
  CRDA: Error: [Errno 2] No such file or directory
  Card0.Amixer.info:
   Card hw:0 'PCH'/'HDA Intel PCH at 0xf6130000 irq 45'
     Mixer name	: 'Realtek ALC892'
     Components	: 'HDA:10ec0892,1849d892,00100302'
     Controls      : 49
     Simple ctrls  : 21
  Card1.Amixer.info:
   Card hw:1 'NVidia'/'HDA NVidia at 0xf6080000 irq 17'
     Mixer name	: 'Nvidia GPU 12 HDMI/DP'
     Components	: 'HDA:10de0012,10de0101,00100100'
     Controls      : 28
     Simple ctrls  : 4
  DistroRelease: Ubuntu 12.04
  HibernationDevice: RESUME=UUID=113b0f24-43a1-4b37-b663-0ee6c9c5c91b
  InstallationMedia: Ubuntu 12.04.3 LTS "Precise Pangolin" - Release amd64 (20130820.1)
  MachineType: To Be Filled By O.E.M. To Be Filled By O.E.M.
  MarkForUpload: True
  NonfreeKernelModules: nvidia
  Package: linux (not installed)
  ProcFB:

  ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-3.8.0-34-generic root=UUID=7dadb5fc-30ea-4006-a203-bbb56395b35f ro acpi=noirq quiet splash
  ProcVersionSignature: Ubuntu 3.8.0-34.49~precise1-generic 3.8.13.12
  RelatedPackageVersions:
   linux-restricted-modules-3.8.0-34-generic N/A
   linux-backports-modules-3.8.0-34-generic  N/A
   linux-firmware                            1.79.9
  RfKill:

  Tags:  precise
  Uname: Linux 3.8.0-34-generic x86_64
  UpgradeStatus: No upgrade log present (probably fresh install)
  UserGroups: adm cdrom dip lpadmin plugdev sambashare sudo
  WifiSyslog:
   Jan  4 11:00:14 jeffrey-desktop kernel: [ 3527.952701] type=1400 audit(1388826014.617:29): apparmor="DENIED" operation="capable" parent=1 profile="/usr/sbin/cupsd" pid=1147 comm="cupsd" pid=1147 comm="cupsd" capability=36  capname="block_suspend"
   Jan  4 11:58:34 jeffrey-desktop kernel: [ 7023.518036] type=1400 audit(1388829514.617:30): apparmor="DENIED" operation="capable" parent=1 profile="/usr/sbin/cupsd" pid=1147 comm="cupsd" pid=1147 comm="cupsd" capability=36  capname="block_suspend"
  dmi.bios.date: 07/03/2013
  dmi.bios.vendor: American Megatrends Inc.
  dmi.bios.version: P1.60
  dmi.board.name: H87 Pro4
  dmi.board.vendor: ASRock
  dmi.chassis.asset.tag: To Be Filled By O.E.M.
  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:bvnAmericanMegatrendsInc.:bvrP1.60:bd07/03/2013:svnToBeFilledByO.E.M.:pnToBeFilledByO.E.M.:pvrToBeFilledByO.E.M.:rvnASRock:rnH87Pro4:rvr:cvnToBeFilledByO.E.M.:ct3:cvrToBeFilledByO.E.M.:
  dmi.product.name: To Be Filled By O.E.M.
  dmi.product.version: To Be Filled By O.E.M.
  dmi.sys.vendor: To Be Filled By O.E.M.
  ---

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