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[prs <peter@xxxxxx>]

Had problem on Lenovo W520 with Kubuntu 14.04 to get external VGA AND LVDS working. 
With Optimus no chance. 
Had to switch to discrete graphics in Bios.
Nvidia drivers nogo.
Switched to Nouveau i.e. reinstalled the driver.
But than had problem with brightness on LVDS.
Finally figured out working boot params:

GRUB_CMDLINE_LINUX_DEFAULT="agp=off quiet splash acpi_osi=linux
thinkpad-acpi.brightness_enable=1 nox2apic"

Other settings like recommended here
https://wiki.ubuntu.com/Kernel/Debugging/Backlight did not work.

Works for now. Will check next on docking station.

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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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