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[Olli Helenius <liff@xxxxxx>]

BIOS upgraded to 1.38 but it didn't solve the problem.

# dmidecode -s bios-version
8CET58WW (1.38 )
# dmidecode -s bios-release-date
07/18/2013

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https://bugs.launchpad.net/bugs/1250027

Title:
  10de:1056 [Lenovo ThinkPad T420s] Fails to boot using nvidia drivers

Status in “linux” package in Ubuntu:
  Incomplete

Bug description:
  Booting a ThinkPad T420s with discrete graphics enabled in the causes
  a hang during the boot. The hang happens somewhere during udev
  startup, I think.

  WORKAROUND: User kernel parameter:
  pci=noacpi

  ProblemType: Bug
  DistroRelease: Ubuntu 13.10
  Package: linux-image-3.11.0-13-generic 3.11.0-13.20
  ProcVersionSignature: Ubuntu 3.11.0-13.20-generic 3.11.6
  Uname: Linux 3.11.0-13-generic x86_64
  NonfreeKernelModules: nvidia
  ApportVersion: 2.12.5-0ubuntu2.1
  Architecture: amd64
  AudioDevicesInUse:
   USER        PID ACCESS COMMAND
   /dev/snd/controlC1:  olli       1732 F.... pulseaudio
   /dev/snd/controlC0:  olli       1732 F.... pulseaudio
   /dev/snd/pcmC0D0p:   olli       1732 F...m pulseaudio
  Date: Mon Nov 11 12:08:47 2013
  HibernationDevice: RESUME=UUID=99eff1be-4759-4df7-99d6-a91a4cf999ce
  InstallationDate: Installed on 2013-10-19 (22 days ago)
  InstallationMedia: Ubuntu 13.10 "Saucy Salamander" - Release amd64 (20131016.1)
  MachineType: LENOVO 4174PEG
  MarkForUpload: True
  ProcFB:

  ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-3.11.0-13-generic root=UUID=e773c67a-283e-4a5d-b1ab-6000e6926d63 ro quiet splash pci=noacpi
  RelatedPackageVersions:
   linux-restricted-modules-3.11.0-13-generic N/A
   linux-backports-modules-3.11.0-13-generic  N/A
   linux-firmware                             1.116
  SourcePackage: linux
  UpgradeStatus: No upgrade log present (probably fresh install)
  dmi.bios.date: 04/11/2013
  dmi.bios.vendor: LENOVO
  dmi.bios.version: 8CET57WW (1.37 )
  dmi.board.asset.tag: Not Available
  dmi.board.name: 4174PEG
  dmi.board.vendor: LENOVO
  dmi.board.version: Not Available
  dmi.chassis.asset.tag: No Asset Information
  dmi.chassis.type: 10
  dmi.chassis.vendor: LENOVO
  dmi.chassis.version: Not Available
  dmi.modalias: dmi:bvnLENOVO:bvr8CET57WW(1.37):bd04/11/2013:svnLENOVO:pn4174PEG:pvrThinkPadT420s:rvnLENOVO:rn4174PEG:rvrNotAvailable:cvnLENOVO:ct10:cvrNotAvailable:
  dmi.product.name: 4174PEG
  dmi.product.version: ThinkPad T420s
  dmi.sys.vendor: LENOVO

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