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[Olli Helenius <liff@xxxxxx>]

Verified on Saucy with stock kernel and 3.12.0 mainline.

Booting with pci=noacpi works, hangs without.

** Tags added: kernel-bug-exists-upstream-3.12.0 saucy

** Tags removed: needs-upstream-testing

** Changed in: linux (Ubuntu)
       Status: Incomplete => Confirmed

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https://bugs.launchpad.net/bugs/1007138

Title:
  Initializing discrete graphics driver nouveau hangs system

Status in “linux” package in Ubuntu:
  Confirmed

Bug description:
  System hangs when loading nouveau (NVS 4200m) driver without pci=noacpi 9 out of 10 times.
  System is Lenovo T420s (7174P4G) set to "discrete graphics" (optimus disabled) in bios.
  (Need this to work with large external monitor).

  ProblemType: Bug
  DistroRelease: Ubuntu 12.04
  Package: linux-image-3.2.0-24-generic 3.2.0-24.39
  ProcVersionSignature: Ubuntu 3.2.0-24.39-generic 3.2.16
  Uname: Linux 3.2.0-24-generic x86_64
  NonfreeKernelModules: nvidia
  AlsaVersion: Advanced Linux Sound Architecture Driver Version 1.0.24.
  ApportVersion: 2.0.1-0ubuntu8
  Architecture: amd64
  ArecordDevices:
   **** List of CAPTURE Hardware Devices ****
   card 0: PCH [HDA Intel PCH], device 0: CONEXANT Analog [CONEXANT Analog]
     Subdevices: 1/1
     Subdevice #0: subdevice #0
  AudioDevicesInUse:
   USER        PID ACCESS COMMAND
   /dev/snd/controlC1:  gbs4       2316 F.... pulseaudio
   /dev/snd/controlC0:  gbs4       2316 F.... pulseaudio
  CRDA: Error: [Errno 2] No such file or directory
  Card0.Amixer.info:
   Card hw:0 'PCH'/'HDA Intel PCH at 0xf4320000 irq 26'
     Mixer name	: 'Conexant CX20590'
     Components	: 'HDA:14f1506e,17aa21d2,00100000'
     Controls      : 8
     Simple ctrls  : 5
  Card1.Amixer.info:
   Card hw:1 'NVidia'/'HDA NVidia at 0xf3000000 irq 11'
     Mixer name	: 'Nvidia GPU 1c HDMI/DP'
     Components	: 'HDA:10de001c,17aa21d2,00100100'
     Controls      : 18
     Simple ctrls  : 3
  Card29.Amixer.info:
   Card hw:29 'ThinkPadEC'/'ThinkPad Console Audio Control at EC reg 0x30, fw unknown'
     Mixer name	: 'ThinkPad EC (unknown)'
     Components	: ''
     Controls      : 1
     Simple ctrls  : 1
  Card29.Amixer.values:
   Simple mixer control 'Console',0
     Capabilities: pswitch pswitch-joined penum
     Playback channels: Mono
     Mono: Playback [on]
  Date: Thu May 31 23:05:04 2012
  HibernationDevice: RESUME=UUID=18b3caac-9a0d-4a39-b658-df34a8a7f1b1
  InstallationMedia: Ubuntu 12.04 LTS "Precise Pangolin" - Release amd64 (20120425)
  MachineType: LENOVO 4174P4G
  ProcEnviron:
   LANGUAGE=en_GB:en
   TERM=xterm
   LANG=en_GB.UTF-8
   SHELL=/bin/bash
  ProcFB:
   
  ProcKernelCmdLine: BOOT_IMAGE=/vmlinuz-3.2.0-24-generic root=/dev/mapper/u_sys-lv_root ro gfxpayload=text rdblacklist=nouveau acpi=noirq
  PulseList: Error: command ['pacmd', 'list'] failed with exit code 1: No PulseAudio daemon running, or not running as session daemon.
  RelatedPackageVersions:
   linux-restricted-modules-3.2.0-24-generic N/A
   linux-backports-modules-3.2.0-24-generic  N/A
   linux-firmware                            1.79
  SourcePackage: linux
  StagingDrivers: mei
  UpgradeStatus: No upgrade log present (probably fresh install)
  dmi.bios.date: 11/29/2011
  dmi.bios.vendor: LENOVO
  dmi.bios.version: 8CET51WW (1.31 )
  dmi.board.asset.tag: Not Available
  dmi.board.name: 4174P4G
  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:bvr8CET51WW(1.31):bd11/29/2011:svnLENOVO:pn4174P4G:pvrThinkPadT420s:rvnLENOVO:rn4174P4G:rvrNotAvailable:cvnLENOVO:ct10:cvrNotAvailable:
  dmi.product.name: 4174P4G
  dmi.product.version: ThinkPad T420s
  dmi.sys.vendor: LENOVO

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