** Changed in: xorg (Ubuntu)
   Importance: Undecided => Medium

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https://bugs.launchpad.net/bugs/1578196

Title:
  External Display Port monitor not working

Status in X.Org X server:
  Confirmed
Status in xorg package in Ubuntu:
  Confirmed

Bug description:
  I have three monitors on my Lenovo X250, one built-in and two
  connected via a Lenovo docking station :

  built-in: 1920x1080
  HP 2335: 1920x1200
  BenQ GW2765: 2560x1440

  The HP is connected via DVI and the BenQ via Display Port.

  In this configuration, I get my HP and built-in ok, but the BenQ
  doesn't show up at all (using xrandr --query).

  If I connect the BenQ via HDMI, then it shows up in xrandr --query,
  but the display is still blank (bandwidth issue?).

  Here's the output with the DVI + DP config :

  $ xrandr --query
  Screen 0: minimum 8 x 8, current 3840 x 1200, maximum 32767 x 32767
  eDP1 connected 1920x1080+1920+0 (normal left inverted right x axis y axis) 
276mm x 156mm
     1920x1080     60.04*+  59.93  
     1680x1050     59.95    59.88  
     1600x1024     60.17  
     1400x1050     59.98  
     1600x900      60.00  
     1280x1024     60.02  
     1440x900      59.89  
     1280x960      60.00  
     1368x768      60.00  
     1360x768      59.80    59.96  
     1152x864      60.00  
     1280x720      60.00  
     1024x768      60.00  
     1024x576      60.00  
     960x540       60.00  
     800x600       60.32    56.25  
     864x486       60.00  
     640x480       59.94  
     720x405       60.00  
     640x360       60.00  
  DP1 disconnected (normal left inverted right x axis y axis)
  DP2 disconnected (normal left inverted right x axis y axis)
  DP2-1 disconnected (normal left inverted right x axis y axis)
  DP2-2 connected primary 1920x1200+0+0 (normal left inverted right x axis y 
axis) 495mm x 310mm
     1920x1200     59.95*+
     1600x1200     60.00  
     1280x1024     85.02    75.02    60.02  
     1280x960      60.00  
     1152x864      75.00  
     1024x768      85.00    75.03    70.07    60.00  
     832x624       74.55  
     800x600       75.00    60.32  
     640x480       75.00    59.94  
     720x400       70.08  
  DP2-3 disconnected (normal left inverted right x axis y axis)
  HDMI1 disconnected (normal left inverted right x axis y axis)
  HDMI2 disconnected (normal left inverted right x axis y axis)
  VIRTUAL1 disconnected (normal left inverted right x axis y axis)

  and with built-in and BenQ only :

  $ xrandr --query
  Screen 0: minimum 8 x 8, current 4480 x 1440, maximum 32767 x 32767
  eDP1 connected primary 1920x1080+0+360 (normal left inverted right x axis y 
axis) 276mm x 156mm
     1920x1080     60.04*+  59.93  
     1680x1050     59.95    59.88  
     1600x1024     60.17  
     1400x1050     59.98  
     1600x900      60.00  
     1280x1024     60.02  
     1440x900      59.89  
     1280x960      60.00  
     1368x768      60.00  
     1360x768      59.80    59.96  
     1152x864      60.00  
     1280x720      60.00  
     1024x768      60.00  
     1024x576      60.00  
     960x540       60.00  
     800x600       60.32    56.25  
     864x486       60.00  
     640x480       59.94  
     720x405       60.00  
     640x360       60.00  
  DP1 disconnected (normal left inverted right x axis y axis)
  DP2 disconnected (normal left inverted right x axis y axis)
  DP2-1 connected 2560x1440+1920+0 (normal left inverted right x axis y axis) 
597mm x 336mm
     2560x1440     59.95*+
     1920x1080     60.00    50.00    59.94  
     1680x1050     59.88  
     1600x900      59.98  
     1280x1024     75.02    60.02  
     1280x800      59.91  
     1152x864      75.00  
     1280x720      60.00    50.00    59.94  
     1024x768      75.08    60.00  
     832x624       74.55  
     800x600       75.00    60.32  
     720x576       50.00  
     720x480       60.00    59.94  
     640x480       75.00    60.00    59.94  
     720x400       70.08  
  DP2-2 disconnected (normal left inverted right x axis y axis)
  DP2-3 disconnected (normal left inverted right x axis y axis)
  HDMI1 disconnected (normal left inverted right x axis y axis)
  HDMI2 disconnected (normal left inverted right x axis y axis)
  VIRTUAL1 disconnected (normal left inverted right x axis y axis)

  This looks relevant :

  <https://lists.freedesktop.org/archives/intel-
  gfx/2016-April/091414.html>

  I'm running kernel 4.6.0-040600rc6-generic (installed as part of the
  debugging process).

  (This bug is the 'next step' from
  <https://bugs.launchpad.net/ubuntu/+source/xorg/+bug/1577760>)

  ProblemType: Bug
  DistroRelease: Ubuntu 16.04
  Package: xorg 1:7.7+13ubuntu3
  Uname: Linux 4.6.0-040600rc6-generic x86_64
  .tmp.unity_support_test.0:
   
  ApportVersion: 2.20.1-0ubuntu2
  Architecture: amd64
  CompizPlugins: No value set for 
`/apps/compiz-1/general/screen0/options/active_plugins'
  CompositorRunning: compiz
  CompositorUnredirectDriverBlacklist: '(nouveau|Intel).*Mesa 8.0'
  CompositorUnredirectFSW: true
  CurrentDesktop: Unity
  Date: Wed May  4 13:39:08 2016
  DistUpgraded: 2016-04-22 10:05:12,580 DEBUG icon theme changed, re-reading
  DistroCodename: xenial
  DistroVariant: ubuntu
  EcryptfsInUse: Yes
  ExtraDebuggingInterest: Yes, including running git bisection searches
  GraphicsCard:
   Intel Corporation Broadwell-U Integrated Graphics [8086:1616] (rev 09) 
(prog-if 00 [VGA controller])
     Subsystem: Lenovo Broadwell-U Integrated Graphics [17aa:2226]
  InstallationDate: Installed on 2015-05-20 (349 days ago)
  InstallationMedia: Ubuntu 15.04 "Vivid Vervet" - Release amd64 (20150422)
  MachineType: LENOVO 20CM001QUK
  ProcKernelCmdLine: BOOT_IMAGE=/vmlinuz-4.6.0-040600rc6-generic 
root=/dev/mapper/ubuntu--vg-root ro quiet splash vt.handoff=7
  SourcePackage: xorg
  UpgradeStatus: Upgraded to xenial on 2016-04-22 (12 days ago)
  dmi.bios.date: 04/06/2015
  dmi.bios.vendor: LENOVO
  dmi.bios.version: N10ET33W (1.12 )
  dmi.board.asset.tag: Not Available
  dmi.board.name: 20CM001QUK
  dmi.board.vendor: LENOVO
  dmi.board.version: SDK0E50510 WIN
  dmi.chassis.asset.tag: No Asset Information
  dmi.chassis.type: 10
  dmi.chassis.vendor: LENOVO
  dmi.chassis.version: None
  dmi.modalias: 
dmi:bvnLENOVO:bvrN10ET33W(1.12):bd04/06/2015:svnLENOVO:pn20CM001QUK:pvrThinkPadX250:rvnLENOVO:rn20CM001QUK:rvrSDK0E50510WIN:cvnLENOVO:ct10:cvrNone:
  dmi.product.name: 20CM001QUK
  dmi.product.version: ThinkPad X250
  dmi.sys.vendor: LENOVO
  version.compiz: compiz 1:0.9.12.2+16.04.20160415-0ubuntu1
  version.ia32-libs: ia32-libs N/A
  version.libdrm2: libdrm2 2.4.67-1
  version.libgl1-mesa-dri: libgl1-mesa-dri 11.2.0-1ubuntu2
  version.libgl1-mesa-dri-experimental: libgl1-mesa-dri-experimental N/A
  version.libgl1-mesa-glx: libgl1-mesa-glx 11.2.0-1ubuntu2
  version.xserver-xorg-core: xserver-xorg-core 2:1.18.3-1ubuntu2
  version.xserver-xorg-input-evdev: xserver-xorg-input-evdev 1:2.10.1-1ubuntu2
  version.xserver-xorg-video-ati: xserver-xorg-video-ati 1:7.7.0-1
  version.xserver-xorg-video-intel: xserver-xorg-video-intel 
2:2.99.917+git20160325-1ubuntu1
  version.xserver-xorg-video-nouveau: xserver-xorg-video-nouveau 
1:1.0.12-1build2
  xserver.bootTime: Wed May  4 12:49:51 2016
  xserver.configfile: default
  xserver.errors:
   
  xserver.logfile: /var/log/Xorg.0.log
  xserver.outputs:
   product id                                1079 
   vendor                                     LGD
  xserver.version: 2:1.18.3-1ubuntu2

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