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[dronus <1453353@xxxxxxxxxxxxxxxxxx>]

Seems to be fixed, I hadn't had this issue for some time now currently
using the 3.13.0-58-generic kernel.

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https://bugs.launchpad.net/bugs/1453353

Title:
  Erratic VGA device appears connected on Thinkpad T420s

Status in linux-lts-trusty package in Ubuntu:
  New

Bug description:
  Just updated to 3.13.0-52-generic kernel, the screen switches
  resolution after every login. This is caused by a clone view mode that
  is enabled by the fact that an "Unknown" display device is considered
  to be connected to the VGA1 output, despite nothing is connected at
  all!

  xrandr says:
  Screen 0: minimum 320 x 200, current 2624 x 900, maximum 8192 x 8192
  LVDS1 connected 1600x900+0+0 (normal left inverted right x axis y axis) 310mm x 174mm
     1600x900       60.0*+
     1440x900       59.9  
     1360x768       59.8     60.0  
     1152x864       60.0  
     1024x768       60.0  
     800x600        60.3     56.2  
     640x480        59.9  
  VGA1 connected 1024x768+1600+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

  ProblemType: Bug
  DistroRelease: Ubuntu 12.04
  Package: linux-image-3.13.0-52-generic 3.13.0-52.86~precise1
  ProcVersionSignature: Ubuntu 3.13.0-52.86~precise1-generic 3.13.11-ckt18
  Uname: Linux 3.13.0-52-generic x86_64
  AlsaVersion: Advanced Linux Sound Architecture Driver Version k3.13.0-52-generic.
  AplayDevices:
   **** List of PLAYBACK Hardware Devices ****
   card 0: PCH [HDA Intel PCH], device 0: CX20590 Analog [CX20590 Analog]
     Subdevices: 1/1
     Subdevice #0: subdevice #0
  ApportVersion: 2.0.1-0ubuntu17.8
  Architecture: amd64
  ArecordDevices:
   **** List of CAPTURE Hardware Devices ****
   card 0: PCH [HDA Intel PCH], device 0: CX20590 Analog [CX20590 Analog]
     Subdevices: 1/1
     Subdevice #0: subdevice #0
  AudioDevicesInUse:
   USER        PID ACCESS COMMAND
   /dev/snd/controlC0:  dronus     2912 F.... pulseaudio
  CRDA:
   country DE:
   	(2400 - 2483 @ 40), (N/A, 20)
   	(5150 - 5250 @ 40), (N/A, 20), NO-OUTDOOR
   	(5250 - 5350 @ 40), (N/A, 20), NO-OUTDOOR, DFS
   	(5470 - 5725 @ 40), (N/A, 26), DFS
  Card0.Amixer.info:
   Card hw:0 'PCH'/'HDA Intel PCH at 0xf2a20000 irq 53'
     Mixer name	: 'Conexant CX20590'
     Components	: 'HDA:14f1506e,17aa21d2,00100000'
     Controls      : 21
     Simple ctrls  : 10
  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: Sat May  9 07:44:14 2015
  EcryptfsInUse: Yes
  HibernationDevice: RESUME=UUID=6ccee672-78cd-4314-817e-edc6c8e72563
  InstallationMedia: Ubuntu 12.04 LTS "Precise Pangolin" - Release amd64 (20120425)
  MachineType: LENOVO 4173W1J
  MarkForUpload: True
  ProcFB: 0 inteldrmfb
  ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-3.13.0-52-generic root=UUID=44f71bef-2898-4ffa-bc57-631db5e42ca7 ro splash quiet
  RelatedPackageVersions:
   linux-restricted-modules-3.13.0-52-generic N/A
   linux-backports-modules-3.13.0-52-generic  N/A
   linux-firmware                             1.79.18
  RfKill:
   0: phy0: Wireless LAN
   	Soft blocked: no
   	Hard blocked: no
  SourcePackage: linux-lts-trusty
  UpgradeStatus: No upgrade log present (probably fresh install)
  dmi.bios.date: 09/14/2011
  dmi.bios.vendor: LENOVO
  dmi.bios.version: 8CET49WW (1.29 )
  dmi.board.asset.tag: Not Available
  dmi.board.name: 4173W1J
  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:bvr8CET49WW(1.29):bd09/14/2011:svnLENOVO:pn4173W1J:pvrThinkPadT420s:rvnLENOVO:rn4173W1J:rvrNotAvailable:cvnLENOVO:ct10:cvrNotAvailable:
  dmi.product.name: 4173W1J
  dmi.product.version: ThinkPad T420s
  dmi.sys.vendor: LENOVO

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