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[Freek <freek_vandeursen@xxxxxxxxxxx>]

I also tried to capture a trace dump as described in
https://help.ubuntu.com/community/DebuggingSystemCrash. Unfortunately
this doesn't work. I tried it on the last 3 freezes, but nothing was
written to the kern.log

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https://bugs.launchpad.net/bugs/1511844

Title:
  System freezes occasionally

Status in linux package in Ubuntu:
  Confirmed

Bug description:
  Occasionally my system freezes totally. When this happens, the screen
  totally freezes, no mouse movements anymore. Switching to Console via
  Ctrl-Alt-F1 or rebooting via Ctrl-Alt-Del does not work. I have waited
  at least 30 min, but the system doesn't seem to recover.

  Some days my system will run for many hours without any problem,  and
  on other days I experience 2 or 3 freezes in an hour time. So far I
  have not noticed any similarities between the moments of freezing in
  regard to programs running etc.

  I filled in this report after reading
  https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1509723 which
  seemed to describe the same thing to me, on a same brand laptop. The
  freezes happened both on Ubuntu 15.04 and 15.10

  ProblemType: Bug
  DistroRelease: Ubuntu 15.10
  Package: linux-image-4.2.0-16-generic 4.2.0-16.19
  ProcVersionSignature: Ubuntu 4.2.0-16.19-generic 4.2.3
  Uname: Linux 4.2.0-16-generic x86_64
  ApportVersion: 2.19.1-0ubuntu4
  Architecture: amd64
  AudioDevicesInUse:
   USER        PID ACCESS COMMAND
   /dev/snd/controlC0:  freek      2223 F.... pulseaudio
  CurrentDesktop: Unity
  Date: Fri Oct 30 21:11:26 2015
  EcryptfsInUse: Yes
  HibernationDevice: RESUME=UUID=c4065390-4392-460d-b828-37b12c4605cb
  InstallationDate: Installed on 2015-07-13 (108 days ago)
  InstallationMedia: Ubuntu 15.04 "Vivid Vervet" - Release amd64 (20150422)
  MachineType: Acer Aspire ES1-711
  ProcFB: 0 inteldrmfb
  ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-4.2.0-16-generic.efi.signed root=UUID=772134c4-7cb5-40d6-b0c7-a6bc4a98efe5 ro quiet splash vt.handoff=7
  RelatedPackageVersions:
   linux-restricted-modules-4.2.0-16-generic N/A
   linux-backports-modules-4.2.0-16-generic  N/A
   linux-firmware                            1.149
  SourcePackage: linux
  UdevLog: Error: [Errno 2] No such file or directory: '/var/log/udev'
  UpgradeStatus: Upgraded to wily on 2015-10-27 (2 days ago)
  dmi.bios.date: 11/07/2014
  dmi.bios.vendor: Insyde Corp.
  dmi.bios.version: V1.05
  dmi.board.asset.tag: Type2 - Board Asset Tag
  dmi.board.name: EA70_BM
  dmi.board.vendor: Acer
  dmi.board.version: Type2 - A01 Board Version
  dmi.chassis.type: 10
  dmi.chassis.vendor: Chassis Manufacturer
  dmi.chassis.version: Chassis Version
  dmi.modalias: dmi:bvnInsydeCorp.:bvrV1.05:bd11/07/2014:svnAcer:pnAspireES1-711:pvrV1.05:rvnAcer:rnEA70_BM:rvrType2-A01BoardVersion:cvnChassisManufacturer:ct10:cvrChassisVersion:
  dmi.product.name: Aspire ES1-711
  dmi.product.version: V1.05
  dmi.sys.vendor: Acer

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