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[Dan Kegel <dank@xxxxxxxxx>]

I switched to the recommended proprietary nvidia driver, and since then there have been no hangs.
So either some update may have fixed it, or it's in the Nouveau driver, or I'm just lucky.

I should try switching back to Nouveau to see if it comes back, and if
it does, I could then try the mainline kernel.

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https://bugs.launchpad.net/bugs/1305172

Title:
  Frequent system hangs, pcieport bus error messages

Status in “linux” package in Ubuntu:
  Incomplete

Bug description:
  I installed Trusty beta 2, and since then have had maximum uptime of about 12 hours.
  System hangs frequently, sometimes with mouse still active, sometimes not.
  The clock in the upper right of the screen shows the time of the hang.
  I have not yet established whether the machine can be pinged when it is in this state.
  Nothing obvious in the logs except an increasingly frequent PCIe bus error
  similar to the one in bug 1279699, e.g.

  Apr  7 17:13:52 dank kernel: [  810.166278] pcieport 0000:00:07.0: AER: Multiple Corrected error received: id=0038
  Apr  7 17:13:52 dank kernel: [  810.166292] pcieport 0000:00:07.0: PCIe Bus Error: severity=Corrected, type=Physical Layer, id=0038(Receiver ID)
  Apr  7 17:13:52 dank kernel: [  810.166297] pcieport 0000:00:07.0:   device [8086:340e] error status/mask=00000081/00002000
  Apr  7 17:13:52 dank kernel: [  810.166300] pcieport 0000:00:07.0:    [ 0] Receiver Error
  Apr  7 17:13:52 dank kernel: [  810.166303] pcieport 0000:00:07.0:    [ 7] Bad DLLP
  Apr  7 17:15:55 dank kernel: [  933.083876] pcieport 0000:00:07.0: AER: Multiple Corrected error received: id=0038
  Apr  7 17:15:55 dank kernel: [  933.083890] pcieport 0000:00:07.0: PCIe Bus Error: severity=Corrected, type=Physical Layer, id=0038(Receiver ID)
  Apr  7 17:15:55 dank kernel: [  933.083895] pcieport 0000:00:07.0:   device [8086:340e] error status/mask=00000001/00002000
  Apr  7 17:15:55 dank kernel: [  933.083898] pcieport 0000:00:07.0:    [ 0] Receiver Error
  Apr  7 17:24:20 dank kernel: [ 1438.648487] pcieport 0000:00:07.0: AER: Multiple Corrected error received: id=0038
  Apr  7 17:24:20 dank kernel: [ 1438.648502] pcieport 0000:00:07.0: PCIe Bus Error: severity=Corrected, type=Physical Layer, id=0038(Receiver ID)
  Apr  7 17:24:20 dank kernel: [ 1438.648506] pcieport 0000:00:07.0:   device [8086:340e] error status/mask=00000001/00002000
  Apr  7 17:24:20 dank kernel: [ 1438.648510] pcieport 0000:00:07.0:    [ 0] Receiver Error         (First)
  ...

  I vacuumed out the dust from the CPU heat sink as I was installing
  Trusty, so who knows, maybe I upset its karmic balance.

  This is with an utterly vanilla installation except that I chose btrfs for the home partition; no proprietary drivers are in use.
  This is one of two machines installed like this; the other does not seem to have this instability.

  The bad machine has graphics card 
  06:00.0 VGA compatible controller: NVIDIA Corporation GT216 [GeForce GT 220] (rev a2)

  ProblemType: Bug
  DistroRelease: Ubuntu 14.04
  Package: linux-image-3.13.0-23-generic 3.13.0-23.45
  ProcVersionSignature: Ubuntu 3.13.0-23.45-generic 3.13.8
  Uname: Linux 3.13.0-23-generic x86_64
  ApportVersion: 2.14.1-0ubuntu1
  Architecture: amd64
  AudioDevicesInUse:
   USER        PID ACCESS COMMAND
   /dev/snd/controlC1:  dank       2011 F.... pulseaudio
   /dev/snd/controlC0:  dank       2011 F.... pulseaudio
  CurrentDesktop: Unity
  Date: Wed Apr  9 09:12:43 2014
  HibernationDevice: RESUME=UUID=417f2bba-dea3-496b-ad18-702d4dc6f223
  InstallationDate: Installed on 2014-04-07 (1 days ago)
  InstallationMedia: Ubuntu 14.04 LTS "Trusty Tahr" - Beta amd64 (20140326)
  IwConfig:
   eth0      no wireless extensions.
   
   lo        no wireless extensions.
  MachineType: To Be Filled By O.E.M. To Be Filled By O.E.M.
  ProcFB: 0 nouveaufb
  ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-3.13.0-23-generic root=UUID=6b949250-7b53-47a9-aa0b-53cd15f3cafe ro quiet splash vt.handoff=7
  RelatedPackageVersions:
   linux-restricted-modules-3.13.0-23-generic N/A
   linux-backports-modules-3.13.0-23-generic  N/A
   linux-firmware                             1.127
  RfKill:
   
  SourcePackage: linux
  UpgradeStatus: No upgrade log present (probably fresh install)
  dmi.bios.date: 08/16/2010
  dmi.bios.vendor: American Megatrends Inc.
  dmi.bios.version: P2.50
  dmi.board.name: X58 Extreme
  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.:bvrP2.50:bd08/16/2010:svnToBeFilledByO.E.M.:pnToBeFilledByO.E.M.:pvrToBeFilledByO.E.M.:rvnASRock:rnX58Extreme: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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