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[Torsten Römer <dode@xxxxxxxxxx>]

Unfortunately I still have this problem, by the time with kubuntu 14.04.
Often when the system is idling for some hours, it eventually freezes.

I again let Memtest86 running, it did 9 passes in more than 13 hours
without error, so it is probably not a memory issue.

There is usually an external screen connected via VGA, but I have seen
the freeze also when running on battery with no external devices
connected, that time while I was working. However, connecting an
external screen prevents the system from suspending - for a reasoning
that I can't follow - so this is why the system may idle for hours and
eventually freeze, while normally it would suspend after half an hour.

The syslog does not show anything besides a line of garbage at the point
where it crashed:

ul 20 18:40:01 linus CRON[5077]: (www-data) CMD ([ -x /usr/share/awstats/tools/update.sh ] && /usr/share/awstats/tools/update.sh)
Jul 20 18:40:01 linus CRON[5076]: (smmsp) CMD (test -x /etc/init.d/sendmail && /usr/share/sendmail/sendmail cron-msp)
Jul 20 18:40:01 linus sm-msp-queue[5093]: My unqualified host name (linus) unknown; sleeping for retry
^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@Jul 20 20:26:39 linus rsyslogd: [origin software="rsyslogd" swVersion="7.4.4" x-pid="969" x-info="http://www.rsyslog.com";] start
Jul 20 20:26:39 linus rsyslogd: rsyslogd's groupid changed to 103
Jul 20 20:26:39 linus rsyslogd: rsyslogd's userid changed to 101
Jul 20 20:26:39 linus kernel: [    0.000000] Initializing cgroup subsys cpuset
Jul 20 20:26:39 linus kernel: [    0.000000] Initializing cgroup subsys cpu
Jul 20 20:26:39 linus kernel: [    0.000000] Initializing cgroup subsys cpuacct
Jul 20 20:26:39 linus kernel: [    0.000000] Linux version 3.13.0-32-generic (buildd@kissel) (gcc version 4.8.2 (Ubuntu 4.8.2-19ubuntu1) ) #57-Ubuntu SMP Tue Jul 15 03:51:08 UTC 2014 (Ubuntu 3.13.0-32.57-generic 3.13.11.4)

Any advice on what I could do to find out what the reason for the
freezes is?

Cheers,
Torsten

** Changed in: linux (Ubuntu)
       Status: Invalid => New

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Packages, which is subscribed to linux in Ubuntu.
https://bugs.launchpad.net/bugs/1255531

Title:
  Daily, random hard freeze/lock up during idle since 13.10

Status in “linux” package in Ubuntu:
  New

Bug description:
  Since about the final version of 13.10 (using it since Beta 2), my
  Lenovo L420 which was running stable until then randomly hard
  freezes/locks up about once a day while idling.

  It never happens while I am using the PC, only when I am away. It
  sometimes runs through a whole night, and sometimes it freezes when I
  leave it idle for just an hour or so. Once it froze while the screen
  was not blank yet, same situation.

  I have tried to disable power management in KDE and run without
  external screen and external harddisks, just on battery with nothing
  connected, then it also happens.

  The screen is usually blank, there is no reaction to either mouse or
  keyboard, switching to a console not possible, connection through VNC
  or SSD not possible. I need to hard-shutdown by long-pressing the
  power button.

  There is nothing in dmesg or syslog, it just ends and continues with
  the restarts. No kernel panics or something like that.

  Any advice on how to trace down the issue or similar experience?

  ProblemType: Bug
  DistroRelease: Ubuntu 13.10
  Package: linux-image-3.11.0-13-generic 3.11.0-13.20
  ProcVersionSignature: Ubuntu 3.11.0-13.20-generic 3.11.6
  Uname: Linux 3.11.0-13-generic x86_64
  ApportVersion: 2.12.5-0ubuntu2.1
  Architecture: amd64
  AudioDevicesInUse:
   USER        PID ACCESS COMMAND
   /dev/snd/controlC0:  dode       2185 F.... pulseaudio
  Date: Wed Nov 27 14:06:00 2013
  HibernationDevice: RESUME=UUID=3f651677-4186-4f48-b0f8-c20b56dbb2e8
  InstallationDate: Installed on 2013-09-08 (80 days ago)
  InstallationMedia: Kubuntu 13.10 "Saucy Salamander" - Alpha amd64 (20130902.2)
  MachineType: LENOVO 78545HG
  MarkForUpload: True
  ProcFB: 0 inteldrmfb
  ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-3.11.0-13-generic root=UUID=5aa9fd7d-cb84-4ab2-90f3-514b79fa541d ro quiet splash
  RelatedPackageVersions:
   linux-restricted-modules-3.11.0-13-generic N/A
   linux-backports-modules-3.11.0-13-generic  N/A
   linux-firmware                             1.116
  SourcePackage: linux
  UpgradeStatus: No upgrade log present (probably fresh install)
  dmi.bios.date: 04/12/2013
  dmi.bios.vendor: LENOVO
  dmi.bios.version: 8GET44WW (1.21 )
  dmi.board.name: 78545HG
  dmi.board.vendor: LENOVO
  dmi.board.version: Not Available
  dmi.chassis.asset.tag: No Asset Information
  dmi.chassis.type: 10
  dmi.chassis.vendor: LENOVO
  dmi.chassis.version: Not Available
  dmi.modalias: dmi:bvnLENOVO:bvr8GET44WW(1.21):bd04/12/2013:svnLENOVO:pn78545HG:pvrThinkPadL420:rvnLENOVO:rn78545HG:rvrNotAvailable:cvnLENOVO:ct10:cvrNotAvailable:
  dmi.product.name: 78545HG
  dmi.product.version: ThinkPad L420
  dmi.sys.vendor: LENOVO

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