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[Xiaochuan Yu <xcyu.se@xxxxxxxxx>]

My laptop freezes after idling over night at lockscreen. I have Lenovo y410p on Ubuntu 14.04.
So far I've been able to "revive" it by going into tty (ctrl+alt+f2) and then do `unity start` which prints some some errors and then brings me to the lockscreen not frozen. The first time I login, screen will flash black for a sec and brings me back to lockscreen and I login again and it works (strange).
I haven't tried disabling CPU Power Management yet.

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https://bugs.launchpad.net/bugs/1255531

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

Status in linux package in Ubuntu:
  Confirmed

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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