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[Shuhao <shuhao@xxxxxxxxxxxx>]

Why was this made confirmed? Does it happen on someone elses' as well?
In the same manner?

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https://bugs.launchpad.net/bugs/1509111

Title:
  Hard lockup but certain UI elements keeps changing

Status in linux package in Ubuntu:
  Confirmed

Bug description:
  I recently upgraded to Wily and I discovered that my system hard
  freezes about 2-3 times a day. This is the usual: unresponsive
  keyboard (including magic sysrq), unresponsive USB, no response to
  pings over the network, music/audio loops, as well as no evidence of
  errors in syslog, kern.log, Xorg.log.

  However, there's one very unusual aspect of this lockup: I have an on
  screen clock to the second and when the lockup occurs, the clock keeps
  ticking by the second! This means that code must be executing
  somewhere... This happened all but one occurance of hard freeze, where
  the clock also froze. In fact, I was on Facebook at one point and saw
  that I was disconnected. The facebook UI then followed up with the
  animation of "Reconnecting... 10... 9... 8...".

  I feel like posting here is a very long shot, but maybe someone else
  has something similar.

  Next time this happens I'll try to hook this machine to ethernet to
  see if there's any response and try to ssh into it. I could also write
  a program that writes to syslog every 5 seconds and see if those get
  written when the machine is "locked up". Not sure what else I can do
  at this point. I can also memtest or play kernel roulette with
  mainline, but the machine was previously stable on utopic (with BIOS
  instead of UEFI boot, tho).

  ProblemType: Bug
  DistroRelease: Ubuntu 15.10
  Package: linux-image-4.2.0-16-generic 4.2.0-16.19 [modified: boot/vmlinuz-4.2.0-16-generic]
  ProcVersionSignature: Ubuntu 4.2.0-16.19-generic 4.2.3
  Uname: Linux 4.2.0-16-generic x86_64
  ApportVersion: 2.19.1-0ubuntu3
  Architecture: amd64
  AudioDevicesInUse:
   USER        PID ACCESS COMMAND
   /dev/snd/controlC0:  shuhao     1884 F.... pulseaudio
  CurrentDesktop: XFCE
  Date: Thu Oct 22 17:49:21 2015
  HibernationDevice: RESUME=UUID=0b162d26-cb30-4f74-b80c-6cd03fd55a69
  InstallationDate: Installed on 2015-10-14 (8 days ago)
  InstallationMedia: Xubuntu 15.10 "Wily Werewolf" - Alpha amd64 (20151013)
  MachineType: LENOVO 4180J4C
  ProcEnviron:
   LANGUAGE=en_CA:en
   PATH=(custom, no user)
   XDG_RUNTIME_DIR=<set>
   LANG=en_CA.UTF-8
   SHELL=/bin/zsh
  ProcFB: 0 inteldrmfb
  ProcKernelCmdLine: BOOT_IMAGE=/vmlinuz-4.2.0-16-generic.efi.signed root=/dev/mapper/xubuntu--vg-root ro noprompt 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: No upgrade log present (probably fresh install)
  dmi.bios.date: 07/05/2013
  dmi.bios.vendor: LENOVO
  dmi.bios.version: 83ET76WW (1.46 )
  dmi.board.asset.tag: Not Available
  dmi.board.name: 4180J4C
  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:bvr83ET76WW(1.46):bd07/05/2013:svnLENOVO:pn4180J4C:pvrThinkPadT420:rvnLENOVO:rn4180J4C:rvrNotAvailable:cvnLENOVO:ct10:cvrNotAvailable:
  dmi.product.name: 4180J4C
  dmi.product.version: ThinkPad T420
  dmi.sys.vendor: LENOVO

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