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[Po-Hsu Lin <po-hsu.lin@xxxxxxxxxxxxx>]

Verified on 201403-14892
This issue does not exist in 3.5.0-54, 3.8.0-44

No display on 3.11 / 3.12 kernel, unable to test
Error message could be found in dmesg:
[   42.575835] [drm:intel_dp_complete_link_train] *ERROR* failed to train DP, aborting
(can't even switch to console, but I can ssh to it)
3.13.0-39, this issue exists.

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https://bugs.launchpad.net/bugs/1393651

Title:
  [Dell Inspiron 3531] "Unknown" display found in display utility
  [8086:0f31]

Status in HWE Next Project:
  Triaged
Status in “linux” package in Ubuntu:
  Confirmed

Bug description:
  CID: 201403-14892 Inspiron 3531

  Even without external monitor connected, there is an "unknown" display in the display utility.
  And in the screenshot, you can see the extended desktop.

  ubuntu@201403-14892:~$ xrandr -q
  Screen 0: minimum 320 x 200, current 2390 x 768, maximum 32767 x 32767
  eDP1 connected primary 1366x768+0+0 (normal left inverted right x axis y axis) 344mm x 194mm
     1366x768       60.0*+   39.9  
     1360x768       59.8     60.0  
     1024x768       60.0  
     800x600        60.3     56.2  
     640x480        59.9  
  VGA1 connected 1024x768+1366+0 (normal left inverted right x axis y axis) 0mm x 0mm
     1024x768       60.0* 
     800x600        60.3     56.2  
     848x480        60.0  
     640x480        59.9  
  HDMI1 disconnected (normal left inverted right x axis y axis)
  DP1 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)

  ubuntu@201403-14892:~$ lspci -nn| grep '\[03'
  00:02.0 VGA compatible controller [0300]: Intel Corporation Atom Processor Z36xxx/Z37xxx Series Graphics & Display [8086:0f31] (rev 0e)

  ProblemType: Bug
  DistroRelease: Ubuntu 14.04
  Package: linux-image-3.13.0-39-generic 3.13.0-39.66
  ProcVersionSignature: Ubuntu 3.13.0-39.66-generic 3.13.11.8
  Uname: Linux 3.13.0-39-generic x86_64
  ApportVersion: 2.14.1-0ubuntu3.5
  Architecture: amd64
  AudioDevicesInUse:
   USER        PID ACCESS COMMAND
   /dev/snd/controlC0:  ubuntu     1520 F.... pulseaudio
  CRDA:
   country TW:
   	(2402 - 2472 @ 40), (3, 27)
   	(5270 - 5330 @ 40), (3, 17), DFS
   	(5735 - 5815 @ 40), (3, 30)
  CurrentDesktop: Unity
  Date: Mon Nov 17 23:02:14 2014
  HibernationDevice: RESUME=UUID=217ae5ce-6101-4b1d-8ed3-e5df8cacfafa
  InstallationDate: Installed on 2014-11-17 (0 days ago)
  InstallationMedia: Ubuntu 14.04 LTS "Trusty Tahr" - Release amd64 (20140417)
  Lsusb:
   Bus 001 Device 005: ID 0bda:0129 Realtek Semiconductor Corp. RTS5129 Card Reader Controller
   Bus 001 Device 004: ID 1a40:0101 Terminus Technology Inc. Hub
   Bus 001 Device 003: ID 0c45:64ad Microdia 
   Bus 001 Device 002: ID 8087:07e6 Intel Corp. 
   Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
  MachineType: Dell Inc. Inspiron 3531
  ProcFB: 0 inteldrmfb
  ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-3.13.0-39-generic root=UUID=34aa7766-e502-48af-81d4-5a155b69c395 ro quiet splash vt.handoff=7
  RelatedPackageVersions:
   linux-restricted-modules-3.13.0-39-generic N/A
   linux-backports-modules-3.13.0-39-generic  N/A
   linux-firmware                             1.127.8
  RfKill:
   0: phy0: Wireless LAN
   	Soft blocked: no
   	Hard blocked: no
  SourcePackage: linux
  StagingDrivers: rts5139
  UpgradeStatus: No upgrade log present (probably fresh install)
  dmi.bios.date: 07/02/2014
  dmi.bios.vendor: Dell Inc.
  dmi.bios.version: A02_UpdateMCU
  dmi.board.name: 00FTTX
  dmi.board.vendor: Dell Inc.
  dmi.board.version: A00
  dmi.chassis.type: 8
  dmi.chassis.vendor: Dell Inc.
  dmi.chassis.version: A02_UpdateMCU
  dmi.modalias: dmi:bvnDellInc.:bvrA02_UpdateMCU:bd07/02/2014:svnDellInc.:pnInspiron3531:pvrA02_UpdateMCU:rvnDellInc.:rn00FTTX:rvrA00:cvnDellInc.:ct8:cvrA02_UpdateMCU:
  dmi.product.name: Inspiron 3531
  dmi.product.version: A02_UpdateMCU
  dmi.sys.vendor: Dell Inc.

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