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[Jan Wester <j.vester@xxxxxxxxx>]

Had exactly the same problems as described here since this morning when kernel was updated to 3.19.0.31 via update-manager. My system is ubuntu 14.04 LTS. With the vivid kernel. Booting with the old kernel, 3.19.0.30, makes everything working again. But trying with 3.19.0.31 seems to totally hang everything after having logged in, unity doesnt display or actually i got it displayed one time but then i had no mouse and no control and ctrl alt f1 didnt work.
So I guess there is something terribly wrong with the -31 kernel.

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https://bugs.launchpad.net/bugs/1503647

Title:
  System hangs with kernel 3.19.0-31

Status in linux package in Ubuntu:
  Confirmed

Bug description:
  After installing kernel 3.19.0-31, the system freezes at login. I got
  following error during install, I don't know if that is the reason for
  the freeze.

  sudo dpkg-reconfigure linux-headers-3.19.0-31 linux-
  headers-3.19.0-31-generic

  Examining /etc/kernel/header_postinst.d.
  run-parts: executing /etc/kernel/header_postinst.d/dkms 3.19.0-31-generic /boot/vmlinuz-3.19.0-31-generic
  ERROR: Cannot create report: [Errno 17] File exists: '/var/crash/i915-3.15-3.13-dkms.0.crash'
  Error! Bad return status for module build on kernel: 3.19.0-31-generic (x86_64)
  Consult /var/lib/dkms/i915-3.15-3.13/0.01/build/make.log for more information.

  ProblemType: Bug
  DistroRelease: Ubuntu 15.04
  Package: linux-headers-3.19.0-31-generic 3.19.0-31.35
  ProcVersionSignature: Ubuntu 3.19.0-30.34-generic 3.19.8-ckt6
  Uname: Linux 3.19.0-30-generic x86_64
  ApportVersion: 2.17.2-0ubuntu1.5
  Architecture: amd64
  AudioDevicesInUse:
   USER        PID ACCESS COMMAND
   /dev/snd/controlC0:  simon      2192 F.... pulseaudio
   /dev/snd/controlC1:  simon      2192 F.... pulseaudio
  CurrentDesktop: Unity
  Date: Wed Oct  7 12:18:47 2015
  HibernationDevice: RESUME=UUID=c929a208-30d1-4e36-9943-d68352b90a26
  InstallationDate: Installed on 2014-07-28 (435 days ago)
  InstallationMedia: Ubuntu 14.04 LTS "Trusty Tahr" - Release amd64 (20140417)
  MachineType: Notebook W65_67SZ
  ProcFB: 0 inteldrmfb
  ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-3.19.0-30-generic root=UUID=da3171d0-cb60-47b3-8584-e10466a6c8a9 ro quiet splash acpi_osi=Linux acpi_backlight=vendor vt.handoff=7
  RelatedPackageVersions:
   linux-restricted-modules-3.19.0-30-generic N/A
   linux-backports-modules-3.19.0-30-generic  N/A
   linux-firmware                             1.143.4
  SourcePackage: linux
  UpgradeStatus: No upgrade log present (probably fresh install)
  dmi.bios.date: 02/26/2014
  dmi.bios.vendor: American Megatrends Inc.
  dmi.bios.version: 1.03.05
  dmi.board.asset.tag: Tag 12345
  dmi.board.name: W65_67SZ
  dmi.board.vendor: Notebook
  dmi.board.version: Not Applicable
  dmi.chassis.asset.tag: No Asset Tag
  dmi.chassis.type: 9
  dmi.chassis.vendor: Notebook
  dmi.chassis.version: N/A
  dmi.modalias: dmi:bvnAmericanMegatrendsInc.:bvr1.03.05:bd02/26/2014:svnNotebook:pnW65_67SZ:pvrNotApplicable:rvnNotebook:rnW65_67SZ:rvrNotApplicable:cvnNotebook:ct9:cvrN/A:
  dmi.product.name: W65_67SZ
  dmi.product.version: Not Applicable
  dmi.sys.vendor: Notebook

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