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[Steffen Eibicht <1372169@xxxxxxxxxxxxxxxxxx>]

after having thought about this a little bit, I would like to write down
as much information as I can.

I wrote "randomly" because it really is randomly. This means, the user can not determine a reason for these reboots. There is no obvious connection between something the user does and the occurence of these nasty reboots. 
This means, that the system could be running for 10 minutes (this was the maximum, I managed) or just a few seconds. Sometimes even at Bootup the system started over.
In my maximum uptime of 10 minutes, I tried to install the fglrx-updates package via this "additional drivers" menu. It downloaded the package and installed - and even during the install of this package, when the system was busy doing something (I was moving the mouse....) it rebooted, leaving a broken system, because fglrx was not installed completely. 

These reboots also happen during install of the system (no previous
operating system present). Mostly it booted up to the menu, where you
can choose to try Ubuntu first or install directly. It showed this menu
and in the next moment, it shut down.

In Bugreport no. 1309578 somebody mentioned in the comments, that moving the mouse constantly does the trick to keep the system running until fglrx is installed. 
I also tried this, but I don't think that this really makes a difference because the system was also shutting down some times, even as I moved the mouse constantly.

I installed the system via Ubuntu 12.04.4 because I did not realise that
some bootoption (radeon.dpm=0) also would do it. But I noticed that
12.04.4 started the Live environment much faster than 14.04. Also after
install, the system booted much faster and as I mentioned already, it
did not have the reboot-issue with the radeon driver. At least I did not
experience it.

Now, 14.04.1 is running flawless with fglrx-updates installed.

I am not really sure, whether this report is helpful because all the
data is collected with fglrx-updates installed. But using the radeon
driver really makes the system unuseable.

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https://bugs.launchpad.net/bugs/1372169

Title:
  random reboot with MSI A78M-E45

Status in “linux” package in Ubuntu:
  Confirmed

Bug description:
  when using the default Radeon-driver on this machine, random reboots
  occure every time. Every time means also during installation of the
  system and after install too. This problem was fixed at this machine
  with the following workaround:

  1. install of Xubuntu 12.04.4 with the default Kernel 3.2

  2. install of the current fglrx-updates package

  3. upgrade to Xubuntu 14.04

  The system now is using the fglrx-updates module and seems to be
  stable. No random reboots after 1 day of testing.

  In the previous mentioned Xubuntu 12.04.4 system, these random reboots
  never occured, also when the default radeon driver package was used.

  The conclusion for me is: there must be some MSI-hardware related
  issue which was not critical for the old 3.2 Kernel as well as the old
  xorg and radeon driver which was used in 12.04.4.

  Thanks

  ProblemType: Bug
  DistroRelease: Ubuntu 14.04
  Package: linux-image-3.13.0-35-generic 3.13.0-35.62
  ProcVersionSignature: Ubuntu 3.13.0-35.62-generic 3.13.11.6
  Uname: Linux 3.13.0-35-generic x86_64
  NonfreeKernelModules: fglrx
  ApportVersion: 2.14.1-0ubuntu3.4
  Architecture: amd64
  AudioDevicesInUse:
   USER        PID ACCESS COMMAND
   /dev/snd/controlC1:  heidi      1492 F.... pulseaudio
   /dev/snd/controlC0:  heidi      1492 F.... pulseaudio
  CurrentDesktop: XFCE
  Date: Sun Sep 21 22:51:17 2014
  HibernationDevice: RESUME=UUID=aa93c7f0-86f0-4169-8f0a-63e522df7eb5
  InstallationDate: Installed on 2014-09-20 (1 days ago)
  InstallationMedia: Xubuntu 12.04.4 LTS "Precise Pangolin" - Release amd64 (20140205)
  IwConfig:
   eth0      no wireless extensions.
   
   lo        no wireless extensions.
  MachineType: MSI MS-7721
  ProcFB: 0 VESA VGA
  ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-3.13.0-35-generic root=UUID=d764f61e-0614-425e-a093-dc2b5001dca4 ro quiet splash vt.handoff=7
  RelatedPackageVersions:
   linux-restricted-modules-3.13.0-35-generic N/A
   linux-backports-modules-3.13.0-35-generic  N/A
   linux-firmware                             1.127.6
  RfKill:
   
  SourcePackage: linux
  UpgradeStatus: Upgraded to trusty on 2014-09-20 (0 days ago)
  dmi.bios.date: 03/18/2014
  dmi.bios.vendor: American Megatrends Inc.
  dmi.bios.version: V25.3
  dmi.board.asset.tag: To be filled by O.E.M.
  dmi.board.name: A78M-E45 (MS-7721)
  dmi.board.vendor: MSI
  dmi.board.version: 5.0
  dmi.chassis.asset.tag: To Be Filled By O.E.M.
  dmi.chassis.type: 3
  dmi.chassis.vendor: MSI
  dmi.chassis.version: 5.0
  dmi.modalias: dmi:bvnAmericanMegatrendsInc.:bvrV25.3:bd03/18/2014:svnMSI:pnMS-7721:pvr5.0:rvnMSI:rnA78M-E45(MS-7721):rvr5.0:cvnMSI:ct3:cvr5.0:
  dmi.product.name: MS-7721
  dmi.product.version: 5.0
  dmi.sys.vendor: MSI

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