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[cologic <1268669@xxxxxxxxxxxxxxxxxx>]

This is a known issue, investigated at https://github.com/Bumblebee-
Project/bbswitch/issues/78 under the title "Memory/data corruption /
crash on Lenovo T440p (GT 730M)".

abbradar suggests that "Working workarounds are either downgrading bios
to 1.14 (solves the problem completely) or using acpi_call to disable
nvidia completely (if you are not using nvidia and are concerned about
power consumption only)."

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https://bugs.launchpad.net/bugs/1268669

Title:
  Lenovo T440p (Haswell/NVidia optimus gfx) flaky unless I blacklist
  nouveau

Status in “linux” package in Ubuntu:
  Triaged

Bug description:
  I have a new Lenovo T440p laptop, which has a Haswell CPU and NVidia
  GPU in an "optimus" setup.  In a default 14.04 install, the system is
  quite flaky: suspend doesn't work and doing lspci apparently corrupts
  memory (the system hits random weird failures and then freezes about
  10 seconds after running lspci).  If I blacklist the nouveau module
  then the system seems to work fine (suspend/resume is good and lspci
  doesn't cause problems).

  ProblemType: Bug
  DistroRelease: Ubuntu 14.04
  Package: linux-image-3.13.0-2-generic 3.13.0-2.17
  ProcVersionSignature: Ubuntu 3.13.0-2.17-generic 3.13.0-rc7
  Uname: Linux 3.13.0-2-generic x86_64
  ApportVersion: 2.13.1-0ubuntu1
  Architecture: amd64
  AudioDevicesInUse:
   USER        PID ACCESS COMMAND
   /dev/snd/controlC0:  roland     2111 F.... pulseaudio
  CurrentDesktop: Unity
  Date: Mon Jan 13 09:35:00 2014
  HibernationDevice: RESUME=UUID=af5ffc5d-f07d-48f1-8bab-636acd0359be
  InstallationDate: Installed on 2014-01-11 (2 days ago)
  InstallationMedia: Ubuntu 14.04 LTS "Trusty Tahr" - Alpha amd64 (20140109)
  MachineType: LENOVO 20ANCTO1WW
  ProcFB: 0 inteldrmfb
  ProcKernelCmdLine: BOOT_IMAGE=/vmlinuz-3.13.0-2-generic.efi.signed root=/dev/mapper/ubuntu--vg-root ro plymouth:debug splash quiet drm.debug=0xe
  RelatedPackageVersions:
   linux-restricted-modules-3.13.0-2-generic N/A
   linux-backports-modules-3.13.0-2-generic  N/A
   linux-firmware                            1.121
  SourcePackage: linux
  UpgradeStatus: No upgrade log present (probably fresh install)
  dmi.bios.date: 12/04/2013
  dmi.bios.vendor: LENOVO
  dmi.bios.version: GLET43WW (1.18 )
  dmi.board.asset.tag: Not Available
  dmi.board.name: 20ANCTO1WW
  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: Not Available
  dmi.modalias: dmi:bvnLENOVO:bvrGLET43WW(1.18):bd12/04/2013:svnLENOVO:pn20ANCTO1WW:pvrThinkPadT440p:rvnLENOVO:rn20ANCTO1WW:rvrNotDefined:cvnLENOVO:ct10:cvrNotAvailable:
  dmi.product.name: 20ANCTO1WW
  dmi.product.version: ThinkPad T440p
  dmi.sys.vendor: LENOVO

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