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[Telofy <1176122@xxxxxxxxxxxxxxxxxx>]

I don’t think this is an Ubuntu bug, but I’ll add my observations anyway
for anyone who might Duck Duck Go this ticket in an effort to find out
what’s happening to their computer.

I have a ThinkPad X200s, and the issue was originally just that upon
entering into suspend, the computer would restart—unfortunately (or even
more so) only a few seconds or minutes after the suspend actually
succeeded, so that my laptop booted in the backpack several times. It
has survived that though.

More recently it began to restart spontaneously. I didn’t make the
connection with the power supply, but in retrospect it does seem like it
only happens when I’m at the university or at friends’ places where I
unplug the AC from time to time. Most of the time I work at home with AC
plugged in all the time, and then the problem never occurs. It may also
be possible that it occurs a while after moving the laptop about (the
acceleration sensors might pick up on that), but the AC theory seems
more likely to me. I don’t think it’s heat-related; the CPU was mostly
idling when it happened the last couple of times.

What I also observed is that after the most recent crash, the syslog and
kern.log files were filled with lots of null bytes at the time of the
crash. Otherwise they didn’t reveal anything insightful to me. I just
cleaned the interior of the laptop and reset the BIOS defaults. If that
doesn’t help, I’ll update the BIOS, but the change log didn’t look like
they fixed any issue similar to this one.

The reason I don’t think it’s Ubuntu-related is that I installed a
Debian a few days ago to convert it into an LMDE (because the LMDE
installer doesn’t support full disk encryption), but the problem
persists.

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https://bugs.launchpad.net/bugs/1176122

Title:
  computer randomly restarts when ac power adapter is used.

Status in “linux” package in Ubuntu:
  Expired

Bug description:
  this is a problem with all ubuntu variants and others based on ubuntu
  (namely linux mint).

  it exists in 13.04 and 12.10 and if the laptop is pluged into ac
  power, the laptop will randomly restart.  it could be in 30 seconds,
  or 30 minutes.  I have left the laptop to sit, at desktop, come back
  and opened a terminal and bam!  computer restarts. no warning.

  by accident I had it unplugged one day and it did not restart once.  I
  finally figured out the source of the problem (ac power cord).

  this problem does not exist with other Linux distributions.  Ubuntu
  and Linux Mint are the only ones with the problem.

  If I install Ubuntu or Mint and run on battery power, excellent. no
  crashes of any kind.

  the problem only exists when ac power charger cable is plugged in.
  ---
  ApportVersion: 2.9.2-0ubuntu8
  Architecture: amd64
  AudioDevicesInUse:
   USER        PID ACCESS COMMAND
   /dev/snd/controlC0:  dave       1955 F.... pulseaudio
  DistroRelease: Ubuntu 13.04
  HibernationDevice: RESUME=UUID=abac56ff-271b-49a5-a912-e76be0c26042
  InstallationDate: Installed on 2013-05-04 (2 days ago)
  InstallationMedia: Ubuntu 13.04 "Raring Ringtail" - Release amd64 (20130424)
  MachineType: ASUSTeK Computer Inc. U56E
  MarkForUpload: True
  Package: linux (not installed)
  ProcEnviron:
   TERM=xterm
   PATH=(custom, no user)
   XDG_RUNTIME_DIR=<set>
   LANG=en_US.UTF-8
   SHELL=/bin/bash
  ProcFB: 0 inteldrmfb
  ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-3.8.0-19-generic root=UUID=11179c05-2874-4d05-be40-9e7468f2d730 ro quiet splash vt.handoff=7
  ProcVersionSignature: Ubuntu 3.8.0-19.30-generic 3.8.8
  RelatedPackageVersions:
   linux-restricted-modules-3.8.0-19-generic N/A
   linux-backports-modules-3.8.0-19-generic  N/A
   linux-firmware                            1.106
  Tags:  raring
  Uname: Linux 3.8.0-19-generic x86_64
  UpgradeStatus: No upgrade log present (probably fresh install)
  UserGroups: adm cdrom dip lpadmin plugdev sambashare sudo
  dmi.bios.date: 09/29/2011
  dmi.bios.vendor: American Megatrends Inc.
  dmi.bios.version: U56E.211
  dmi.board.asset.tag: ATN12345678901234567
  dmi.board.name: U56E
  dmi.board.vendor: ASUSTeK Computer Inc.
  dmi.board.version: 1.0
  dmi.chassis.asset.tag: No Asset Tag
  dmi.chassis.type: 10
  dmi.chassis.vendor: ASUSTeK Computer Inc.
  dmi.chassis.version: 1.0
  dmi.modalias: dmi:bvnAmericanMegatrendsInc.:bvrU56E.211:bd09/29/2011:svnASUSTeKComputerInc.:pnU56E:pvr1.0:rvnASUSTeKComputerInc.:rnU56E:rvr1.0:cvnASUSTeKComputerInc.:ct10:cvr1.0:
  dmi.product.name: U56E
  dmi.product.version: 1.0
  dmi.sys.vendor: ASUSTeK Computer Inc.

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