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[Timo Aaltonen <tjaalton@xxxxxxxxxx>]

this is bug https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1503655

introduced in -31.35, fixed in -31.36. I'll build another test kernel.

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https://bugs.launchpad.net/bugs/1506746

Title:
  [i915_bpo] System often hangs at the login screen after update to
  3.19.0-31.35+bpo1

Status in linux package in Ubuntu:
  Invalid

Bug description:
  After update to test kernel 3.19.0-31.35+bpo1, the system often hang
  at the login screen during system booting or reboot.

  Test configs:
  Intel broadwell UMA graphics
  Intel SKL-H graphics 
  Intel SKL-U graphics

  Kernel version: 3.19.0-31.35+bpo1
  Failure units: The above mentioned configs
  --- 
  ApportVersion: 2.14.1-0ubuntu3.12
  Architecture: amd64
  AudioDevicesInUse:
   USER        PID ACCESS COMMAND
   /dev/snd/controlC0:  u          2220 F.... pulseaudio
  CurrentDesktop: Unity
  DistributionChannelDescriptor:
   # This is a distribution channel descriptor
   # For more information see http://wiki.ubuntu.com/DistributionChannelDescriptor
   canonical-oem-kittyhawk2-trusty-amd64-20150907-1
  DistroRelease: Ubuntu 14.04
  HibernationDevice: RESUME=UUID=e81a6713-73c4-4380-a020-308203d60eb2
  InstallationDate: Installed on 2015-10-13 (2 days ago)
  InstallationMedia: Ubuntu 14.04 "Trusty" - Failed to find casper uuid.conf in 'binary/casper/initrd.img-3.19.0-28-generic.old-dkms' LIVE Binary 20150907-22:18
  IwConfig:
   eth0      no wireless extensions.
   
   lo        no wireless extensions.
  MachineType: Dell Inc. Latitude E5470
  Package: linux (not installed)
  ProcFB: 0 inteldrmfb
  ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-3.19.0-31-generic root=UUID=bdf8893c-9b81-46e3-8943-21a4c75fddcd ro quiet splash vt.handoff=7
  ProcVersionSignature: Ubuntu 3.19.0-31.35+bpo1-generic 3.19.8-ckt7
  RelatedPackageVersions:
   linux-restricted-modules-3.19.0-31-generic N/A
   linux-backports-modules-3.19.0-31-generic  N/A
   linux-firmware                             1.127.15
  Tags:  trusty
  Uname: Linux 3.19.0-31-generic x86_64
  UpgradeStatus: No upgrade log present (probably fresh install)
  UserGroups: adm cdrom dip lpadmin plugdev sambashare sudo
  _MarkForUpload: True
  dmi.bios.date: 09/03/2015
  dmi.bios.vendor: Dell Inc.
  dmi.bios.version: 99.3.34
  dmi.board.vendor: Dell Inc.
  dmi.chassis.type: 9
  dmi.chassis.vendor: Dell Inc.
  dmi.modalias: dmi:bvnDellInc.:bvr99.3.34:bd09/03/2015:svnDellInc.:pnLatitudeE5470:pvr:rvnDellInc.:rn:rvr:cvnDellInc.:ct9:cvr:
  dmi.product.name: Latitude E5470
  dmi.sys.vendor: Dell Inc.

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