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[Mario Splivalo <mario.splivalo@xxxxxxxxxxxxx>]

I case anyone runs into this later in time:

I just got W520 and moved my Trusty installation from T520. Had various
issues, mostly explained above. Upgraded to nvidia-352, upgraded to
linux-image-generic-lts-wily (linux 4.2.0), problems persisted.

Then I just disabled VT-d in BIOS, and all the problems are gone. Didn't
need to supply any special kernel boot parameters (my
GRUB_CMDLINE_LINUX_DEFAULT line holds only 'verbose' in it).

I am running BIOS v1.30.

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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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