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[Alberto Milone <alberto.milone@xxxxxxxxxxxxx>]

LP: #1290711 is the relevant bug report for 14.04

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https://bugs.launchpad.net/bugs/1079933

Title:
  [Lenovo ThinkPad T530] External display does not work through Display
  port or VGA

Status in “linux” package in Ubuntu:
  Incomplete
Status in “linux” source package in Precise:
  Confirmed

Bug description:
  Problem: 
  Connecting a display through the display port does nothing. I can try to press the key combo fn + f7 or trigger the monitor to refresh and the display is still blank on the external monitor.

  udev does not seem to notice the display port connection either.

  Expected result: External display should be mirrored when inserting a
  display port or VGA connection.

  Video info

  [    0.729694] pci 0000:00:02.0: Boot video device
  [   13.071619] Linux video capture interface: v2.00
  [   13.099290] uvcvideo: Found UVC 1.00 device Integrated Camera (5986:02d2)
  [   13.101511] usbcore: registered new interface driver uvcvideo
  [   13.101512] USB Video Class driver (1.1.1)
  [   13.182383] input: Video Bus as /devices/LNXSYSTM:00/device:00/PNP0A08:00/LNXVIDEO:00/input/input7
  [   13.183068] ACPI: Video Device [VID] (multi-head: yes  rom: no  post: no)
  ubuntu@201205-11132:~$ dmesg | grep -i graphics
  [   12.371300] [drm] MTRR allocation failed.  Graphics performance may suffer.

  ProblemType: Bug
  DistroRelease: Ubuntu 12.04
  Package: linux-image-3.2.0-29-generic 3.2.0-29.46
  ProcVersionSignature: Ubuntu 3.2.0-29.46-generic 3.2.24
  Uname: Linux 3.2.0-29-generic x86_64
  AlsaVersion: Advanced Linux Sound Architecture Driver Version 1.0.24.
  ApportVersion: 2.0.1-0ubuntu12
  Architecture: amd64
  ArecordDevices:
   **** List of CAPTURE Hardware Devices ****
   card 0: PCH [HDA Intel PCH], device 0: ALC269VC Analog [ALC269VC Analog]
     Subdevices: 1/1
     Subdevice #0: subdevice #0
  AudioDevicesInUse:
   USER        PID ACCESS COMMAND
   /dev/snd/controlC0:  ubuntu     1539 F.... pulseaudio
  Card0.Amixer.info:
   Card hw:0 'PCH'/'HDA Intel PCH at 0xf2530000 irq 46'
     Mixer name	: 'Intel PantherPoint HDMI'
     Components	: 'HDA:10ec0269,17aa21f6,00100203 HDA:80862806,80860101,00100000'
     Controls      : 36
     Simple ctrls  : 13
  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: Fri Nov 16 18:44:51 2012
  HibernationDevice: RESUME=UUID=33af243d-8694-4458-a1eb-5c94d7303d8e
  InstallationMedia: Ubuntu 12.04.1 LTS "Precise Pangolin" - Release amd64 (20120823.1)
  MachineType: LENOVO 235923U
  ProcEnviron:
   TERM=xterm
   PATH=(custom, no user)
   LANG=en_US.UTF-8
   SHELL=/bin/bash
  ProcFB: 0 inteldrmfb
  ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-3.2.0-29-generic root=UUID=212db818-8dcd-4bbd-94a9-0a9ca8d086a3 ro quiet splash initcall_debug vt.handoff=7
  RelatedPackageVersions:
   linux-restricted-modules-3.2.0-29-generic N/A
   linux-backports-modules-3.2.0-29-generic  N/A
   linux-firmware                            1.79
  SourcePackage: linux
  StagingDrivers: mei
  UpgradeStatus: No upgrade log present (probably fresh install)
  dmi.bios.date: 05/29/2012
  dmi.bios.vendor: LENOVO
  dmi.bios.version: G4ET37WW (1.12 )
  dmi.board.asset.tag: Not Available
  dmi.board.name: 235923U
  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:bvrG4ET37WW(1.12):bd05/29/2012:svnLENOVO:pn235923U:pvrThinkPadT530:rvnLENOVO:rn235923U:rvrNotAvailable:cvnLENOVO:ct10:cvrNotAvailable:
  dmi.product.name: 235923U
  dmi.product.version: ThinkPad T530
  dmi.sys.vendor: LENOVO

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