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apport information

** Attachment added: "CurrentDmesg.txt"
   https://bugs.launchpad.net/bugs/1516216/+attachment/4519354/+files/CurrentDmesg.txt

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https://bugs.launchpad.net/bugs/1516216

Title:
  X fails to start, starting with kernel version 3.13.0-66 including
  3.13.0-68

Status in linux package in Ubuntu:
  Incomplete

Bug description:
  System: Ubuntu 14.04
  Graphics Card: Geforce GTX 670
  Graphics Driver: nvidia-352.55

  Starting with kernel 3.13.0-66, the start of X / default display manager results in a black screen. My observations are:
  - When I get this black screen, I cannot CTRL+ALT+F1 into a text console
  - Pressing the power button in this state leads to a proper shutdown (which I guess means that it is not a complete kernel panic).
  - When using these latest kernel, the graphics behavior during boot-up also has changed. Instead of a graphical animation, the system boots in text mode (I can see the syslog output), and at the moment I should get the display manager, the screen goes black.

  My work-around so far has been to boot kernel 3.13.0-65 instead of
  3.13.0-66, 3.13.0-67, or 3.13.0-68. So far this has worked reliably.
  However today, booting kernel 3.13.0-65 has resulted in a black screen
  as well. Fortunately, I found a new work-around: I can boot kernel
  3.13.0-68 in recovery mode, and chose simply "continue" in the
  recovery console. With this modification of the boot process, X will
  start.

  In the syslog, I can see some suspicious messages, around the time X
  should start: "BUG: unable to handle kernel NULL pointer dereference
  at (null)". I have attached a syslog contain some failed starts as
  well as a successful one.

  Another suspicion is that the problem is related having an Oculus Rift DK2 connected. In particular, this requires to use a custom Xorg.conf which runs individual X screens for the main display and the Oculus Rift.
  --- 
  ApportVersion: 2.14.1-0ubuntu3.18
  Architecture: amd64
  AudioDevicesInUse:
   USER        PID ACCESS COMMAND
   /dev/snd/controlC1:  fabian     2526 F.... pulseaudio
   /dev/snd/controlC0:  fabian     2526 F.... pulseaudio
  CurrentDesktop: Unity
  DistroRelease: Ubuntu 14.04
  HibernationDevice: RESUME=UUID=dfcf8d87-ab70-490e-922d-2ccfd8acdfcc
  InstallationDate: Installed on 2014-04-24 (569 days ago)
  InstallationMedia: Ubuntu 14.04 LTS "Trusty Tahr" - Release amd64 (20140417)
  IwConfig:
   eth0      no wireless extensions.
   
   lo        no wireless extensions.
  MachineType: MSI MS-7816
  NonfreeKernelModules: nvidia
  Package: linux (not installed)
  ProcFB:
   
  ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-3.13.0-68-generic root=UUID=58115c9d-156a-4608-9adb-e20d7ffc9b11 ro recovery nomodeset
  ProcVersionSignature: Ubuntu 3.13.0-68.111-generic 3.13.11-ckt27
  RelatedPackageVersions:
   linux-restricted-modules-3.13.0-68-generic N/A
   linux-backports-modules-3.13.0-68-generic  N/A
   linux-firmware                             1.127.18
  RfKill:
   
  Tags:  trusty
  Uname: Linux 3.13.0-68-generic x86_64
  UpgradeStatus: No upgrade log present (probably fresh install)
  UserGroups: adm cdrom dip lpadmin plugdev sambashare sudo
  _MarkForUpload: True
  dmi.bios.date: 05/17/2013
  dmi.bios.vendor: American Megatrends Inc.
  dmi.bios.version: V1.2
  dmi.board.asset.tag: To be filled by O.E.M.
  dmi.board.name: Z87-G43 (MS-7816)
  dmi.board.vendor: MSI
  dmi.board.version: 1.0
  dmi.chassis.asset.tag: To Be Filled By O.E.M.
  dmi.chassis.type: 3
  dmi.chassis.vendor: MSI
  dmi.chassis.version: 1.0
  dmi.modalias: dmi:bvnAmericanMegatrendsInc.:bvrV1.2:bd05/17/2013:svnMSI:pnMS-7816:pvr1.0:rvnMSI:rnZ87-G43(MS-7816):rvr1.0:cvnMSI:ct3:cvr1.0:
  dmi.product.name: MS-7816
  dmi.product.version: 1.0
  dmi.sys.vendor: MSI

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