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[jz <syed.zaib@xxxxxxxxx>]

This problem still Presist in Ubuntu 14.04 (fully updated as of today).
I have Lenovo W520 running Ubuntu 14.04 and NVIDIA Corporation GF108GLM
[Quadro 1000M]. Anything that tries to change brightness can freeze the
system, but only if running in Discrete Graphics Mode (in BIOS). I need
Discrete mode to run multi-monitor setup.

Workaround I am currently using successfully is to disable Vt-d through
bios (as others suggested). But this is limiting my system's capability
to effectively utilize visualization technologies.

Please fix this. (Please let me know if I can be of any help in this
regard).

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https://bugs.launchpad.net/bugs/776999

Title:
  [Lenovo W520] laptop freezes on ACPI-related actions

Status in linux package in Ubuntu:
  Won't Fix

Bug description:
  Binary package hint: gnome-power-manager

  I got the latest Ubuntu installed on a Lenovo W520 with graphics set
  to Nvidia discrete card. The laptop freezes, however, on power-
  management actions, such as brightness change and sleep/wake-up. A
  particularly annoying problem is that the machine freezes
  automatically after a GUI login if I had started gnome-power-manager
  previously. I have to remove the gnome-power-manager settings
  directory in order to get back in.

  If I boot with acpi=off parameter to the kernel things work fine, but
  then again no ACPI functionality is available.

  ProblemType: Bug
  DistroRelease: Ubuntu 11.04
  Package: gnome-power-manager 2.32.0-2ubuntu2
  ProcVersionSignature: Ubuntu 2.6.38-8.42-generic 2.6.38.2
  Uname: Linux 2.6.38-8-generic x86_64
  NonfreeKernelModules: nvidia
  Architecture: amd64
  Date: Wed May  4 13:09:50 2011
  EcryptfsInUse: Yes
  GnomeSessionIdleInhibited: No
  GnomeSessionInhibitors: None
  GnomeSessionSuspendInhibited: No
  InstallationMedia: Ubuntu 11.04 "Natty Narwhal" - Release amd64 (20110427.1)
  MachineType: LENOVO 427638U
  ProcEnviron:
   LANGUAGE=en_US:en
   LANG=en_US.UTF-8
   SHELL=/bin/bash
  ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-2.6.38-8-generic root=UUID=df7a5cd8-18b4-4b7a-92c8-6cc8f3647cc9 ro quiet splash vt.handoff=7
  SourcePackage: gnome-power-manager
  UpgradeStatus: No upgrade log present (probably fresh install)
  dmi.bios.date: 03/02/2011
  dmi.bios.vendor: LENOVO
  dmi.bios.version: 8BET30WW (1.06 )
  dmi.board.asset.tag: Not Available
  dmi.board.name: 427638U
  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:bvr8BET30WW(1.06):bd03/02/2011:svnLENOVO:pn427638U:pvrThinkPadW520:rvnLENOVO:rn427638U:rvrNotAvailable:cvnLENOVO:ct10:cvrNotAvailable:
  dmi.product.name: 427638U
  dmi.product.version: ThinkPad W520
  dmi.sys.vendor: LENOVO

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