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[Liming Wang <liming.wang@xxxxxxxxxxxxx>]

I have tested 3.16.0-37 and 3.16.0-38, all work well. It seems that only
3.16.0-36 has the issue. So from 3.16.0-36 to 3.16.0-37, there are some
commits that have already fixed the issue. We need to find out which
commits to fix the issue

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https://bugs.launchpad.net/bugs/1451357

Title:
  [Lenovo SazanW-2] system got hang and screen became black after
  execute upgrade under 14.04.2

Status in HWE Next Project:
  New
Status in linux-lts-utopic package in Ubuntu:
  New

Bug description:
  CID : 201412-16338  SazanW-2

  00:02.0 VGA compatible controller [0300]: Intel Corporation Broadwell-U Integrated Graphics [8086:1616] (rev 09)
  08:00.0 3D controller [0302]: NVIDIA Corporation Device [10de:137a] (rev a2)

  Repro steps:
  1. Install 14.04.2 on SazanW-2
  2. Execute upgrade by 'Software Updater'
  3. Make sure kernel upgrade from 3.16.0-30 to 3.16.0-36
  4. Reboot system and verify the result.

  Actual result:
  a, Booting, GRUB is pass, then system got hang and screen became black. tty1~7 are useless.

  b, Try to add a 'text' kernel parameter on GRUB page, booting system,
  got the same actual result.

  c, After system got hang, try to get logs via 'SSH', get result
  'Connection refused'.

  Notes:
  Because there is no available NV driver, system is working on 8086:1616 now. Since I can not get any logs under 3.16.0-36, just attach all logs under 3.16.0-30 here.

  ProblemType: Bug
  DistroRelease: Ubuntu 14.04
  Package: linux-image-3.16.0-30-generic 3.16.0-30.40~14.04.1 [modified: boot/vmlinuz-3.16.0-30-generic]
  ProcVersionSignature: Ubuntu 3.16.0-30.40~14.04.1-generic 3.16.7-ckt3
  Uname: Linux 3.16.0-30-generic x86_64
  ApportVersion: 2.14.1-0ubuntu3.10
  Architecture: amd64
  CurrentDesktop: Unity
  Date: Mon May  4 03:59:56 2015
  InstallationDate: Installed on 2015-05-04 (0 days ago)
  InstallationMedia: Ubuntu 14.04.2 LTS "Trusty Tahr" - Release amd64 (20150218.1)
  SourcePackage: linux-lts-utopic
  UpgradeStatus: No upgrade log present (probably fresh install)
  ---
  ApportVersion: 2.14.1-0ubuntu3.10
  Architecture: amd64
  AudioDevicesInUse:
   USER        PID ACCESS COMMAND
   /dev/snd/controlC1:  u          1831 F.... pulseaudio
   /dev/snd/controlC0:  u          1831 F.... pulseaudio
  CurrentDesktop: Unity
  DistroRelease: Ubuntu 14.04
  HibernationDevice: RESUME=UUID=d16d1f82-8c29-4e0b-bd58-fea8bb414c5b
  InstallationDate: Installed on 2015-05-04 (0 days ago)
  InstallationMedia: Ubuntu 14.04.2 LTS "Trusty Tahr" - Release amd64 (20150218.1)
  MachineType: LENOVO 20E1Z0X8US
  Package: linux (not installed)
  ProcFB: 0 inteldrmfb
  ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-3.16.0-30-generic root=UUID=1dde7ba0-2958-40e5-9dc6-d047ced139d2 ro quiet splash
  ProcVersionSignature: Ubuntu 3.16.0-30.40~14.04.1-generic 3.16.7-ckt3
  RelatedPackageVersions:
   linux-restricted-modules-3.16.0-30-generic N/A
   linux-backports-modules-3.16.0-30-generic  N/A
   linux-firmware                             1.127.11
  Tags:  trusty
  Uname: Linux 3.16.0-30-generic x86_64
  UpgradeStatus: No upgrade log present (probably fresh install)
  UserGroups: adm cdrom dip lpadmin plugdev sambashare sudo
  _MarkForUpload: True
  dmi.bios.date: 11/17/2014
  dmi.bios.vendor: LENOVO
  dmi.bios.version: N11ET26W (1.02 )
  dmi.board.asset.tag: Not Available
  dmi.board.name: 20E1Z0X8US
  dmi.board.vendor: LENOVO
  dmi.board.version: Not Defined
  dmi.chassis.asset.tag: No Asset Information
  dmi.chassis.type: 10
  dmi.chassis.vendor: LENOVO
  dmi.chassis.version: None
  dmi.modalias: dmi:bvnLENOVO:bvrN11ET26W(1.02):bd11/17/2014:svnLENOVO:pn20E1Z0X8US:pvrThinkPadW550s:rvnLENOVO:rn20E1Z0X8US:rvrNotDefined:cvnLENOVO:ct10:cvrNone:
  dmi.product.name: 20E1Z0X8US
  dmi.product.version: ThinkPad W550s
  dmi.sys.vendor: LENOVO

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