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[Rovanion <1292036@xxxxxxxxxxxxxxxxxx>]

I was able to test with the latest 4.3 rc3 kernel. The output of xrandr
is no different to that above and neither lxrandr nor arandr was able to
detect an external screen as they usually are when I plug them in on the
VGA port.

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

** Tags added: kernel-bug-exists-upstream-4.3-rc3

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Title:
  Displayport on Thinkpad T420s is not usable

Status in linux package in Ubuntu:
  Confirmed

Bug description:
  Hi,
  I'm trying to connect an external screen to my thinkpad T420s. I'm running Ubuntu 14.04 and here is the output of xrandr:

  $ xrandr
  Screen 0: minimum 320 x 200, current 1600 x 900, maximum 32767 x 32767
  LVDS1 connected primary 1600x900+0+0 (normal left inverted right x axis y axis) 309mm x 174mm
     1600x900       60.0*+   40.0  
     1440x900       59.9  
     1360x768       59.8     60.0  
     1152x864       60.0  
     1024x768       60.0  
     800x600        60.3     56.2  
     640x480        59.9  
  VGA1 disconnected (normal left inverted right x axis y axis)
  VIRTUAL1 disconnected (normal left inverted right x axis y axis)

  LVDS1 is the LCD-display on the laptop. This is the output of lspci:

  $ lspci | grep VGA
  00:02.0 VGA compatible controller: Intel Corporation 2nd Generation Core Processor Family Integrated Graphics Controller (rev 09)
  01:00.0 VGA compatible controller: NVIDIA Corporation GF119M [NVS 4200M] (rev ff)

  The screen recognises that something is plugged into the DisplayPort
  but Ubuntu is unable to send output to it. It's probably related to
  the whole dual graphics card thing.

  Thank you for reading this bug!

  ProblemType: Bug
  DistroRelease: Ubuntu 14.04
  Package: xorg 1:7.7+1ubuntu8
  ProcVersionSignature: Ubuntu 3.13.0-16.36-generic 3.13.5
  Uname: Linux 3.13.0-16-generic i686
  ApportVersion: 2.13.3-0ubuntu1
  Architecture: i386
  CompizPlugins: [core,composite,opengl,compiztoolbox,decor,vpswitch,snap,mousepoll,resize,place,move,wall,grid,regex,imgpng,session,gnomecompat,animation,fade,unitymtgrabhandles,workarounds,scale,expo,ezoom,unityshell]
  CompositorRunning: None
  Date: Thu Mar 13 15:32:36 2014
  DistUpgraded: 2014-02-24 23:10:48,392 DEBUG enabling apt cron job
  DistroCodename: trusty
  DistroVariant: ubuntu
  EcryptfsInUse: Yes
  ExtraDebuggingInterest: Yes
  GraphicsCard:
   Intel Corporation 2nd Generation Core Processor Family Integrated Graphics Controller [8086:0126] (rev 09) (prog-if 00 [VGA controller])
     Subsystem: Lenovo Device [17aa:21d3]
   NVIDIA Corporation GF119M [NVS 4200M] [10de:1056] (rev ff) (prog-if ff)
  InstallationDate: Installed on 2013-08-07 (217 days ago)
  InstallationMedia: Ubuntu 12.04.2 LTS "Precise Pangolin" - Release i386 (20130213)
  MachineType: LENOVO 4174PEG
  ProcEnviron:
   TERM=xterm
   PATH=(custom, no user)
   XDG_RUNTIME_DIR=<set>
   LANG=sv_SE.UTF-8
   SHELL=/bin/bash
  ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-3.13.0-16-generic root=UUID=7d44dac8-470f-4bb6-a331-e31a6e61ea51 ro quiet splash vt.handoff=7
  SourcePackage: xorg
  UpgradeStatus: Upgraded to trusty on 2014-02-24 (16 days ago)
  dmi.bios.date: 11/01/2011
  dmi.bios.vendor: LENOVO
  dmi.bios.version: 8CET50WW (1.30 )
  dmi.board.asset.tag: Not Available
  dmi.board.name: 4174PEG
  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:bvr8CET50WW(1.30):bd11/01/2011:svnLENOVO:pn4174PEG:pvrThinkPadT420s:rvnLENOVO:rn4174PEG:rvrNotAvailable:cvnLENOVO:ct10:cvrNotAvailable:
  dmi.product.name: 4174PEG
  dmi.product.version: ThinkPad T420s
  dmi.sys.vendor: LENOVO
  version.compiz: compiz 1:0.9.11+14.04.20140305-0ubuntu1
  version.libdrm2: libdrm2 2.4.52-1
  version.libgl1-mesa-dri: libgl1-mesa-dri 10.1.0~rc3-0ubuntu3
  version.libgl1-mesa-dri-experimental: libgl1-mesa-dri-experimental N/A
  version.libgl1-mesa-glx: libgl1-mesa-glx 10.1.0~rc3-0ubuntu3
  version.xserver-xorg-core: xserver-xorg-core 2:1.15.0-1ubuntu6
  version.xserver-xorg-input-evdev: xserver-xorg-input-evdev 1:2.8.2-1ubuntu2
  version.xserver-xorg-video-ati: xserver-xorg-video-ati 1:7.3.0-1ubuntu3
  version.xserver-xorg-video-intel: xserver-xorg-video-intel 2:2.99.910-0ubuntu1
  version.xserver-xorg-video-nouveau: xserver-xorg-video-nouveau 1:1.0.10-1ubuntu2
  xserver.bootTime: Thu Mar 13 14:44:03 2014
  xserver.configfile: default
  xserver.errors: Failed to load module "nvidia" (module does not exist, 0)
  xserver.logfile: /var/log/Xorg.0.log
  xserver.outputs:
   product id                                8510 
   vendor                                     AUO
  xserver.version: 2:1.15.0-1ubuntu6

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