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[Marius Gedminas <marius@xxxxxxxxx>]

A simpler workaround: pressing Fn-Home/Fn-End (screen brightness control
keys) after plugging in the DisplayPort cable also triggers detection.

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https://bugs.launchpad.net/bugs/1263681

Title:
  8086:0126 [Lenovo a ThinkPad X220] DisplayPort-2-DVI not hotplugging

Status in “xserver-xorg-video-intel” package in Ubuntu:
  New

Bug description:
  WIth my Lenovo ThinkPad X220 I am unable to hotplug a DisplayPort-2-DVI cable, plug the DVI end into a monitor (Samsung SyncMaster 193p+), and plug the DP end into the ThinkPad, and it is detected within a reasonable time, with GNOME automatically extending my desktop. If I *unplug* the DP cable, the unplug is detected instantly.
  I once waited ~5 minutes without running xrandr, and it actually detected the monitor and reconfigured.

  WORKAROUND: If I run 'xrandr' in an xterm, the monitor is detected
  instantly and GNOME reconfigures the screen.

  WORKAROUND: if I open System Preferences -> Display, it does an xrandr
  probe and instantly detects/reconfigures the screen.

  WORKAROUND: if I plug the DP cable before I open the laptop lid to
  wake it up from S3 sleep, the external monitor is detected.

  WORKAROUND: if I use a VGA cable instead of the DP -> DVI one, hotplug
  is detected within seconds.

  ProblemType: Bug
  DistroRelease: Ubuntu 13.10
  Package: linux-image-extra-3.11.0-15-generic 3.11.0-15.23
  ProcVersionSignature: Ubuntu 3.11.0-15.23-generic 3.11.10
  Uname: Linux 3.11.0-15-generic x86_64
  ApportVersion: 2.12.5-0ubuntu2.2
  Architecture: amd64
  AudioDevicesInUse:
   USER        PID ACCESS COMMAND
   /dev/snd/controlC0:  mg         2722 F.... pulseaudio
  Date: Mon Dec 23 14:33:12 2013
  EcryptfsInUse: Yes
  HibernationDevice: RESUME=UUID=bf592a79-5f4e-486d-b69d-7525d492dcc6
  InstallationDate: Installed on 2012-07-25 (515 days ago)
  InstallationMedia: Ubuntu 12.04 LTS "Precise Pangolin" - Release amd64 (20120425)
  Lsusb:
   Bus 002 Device 002: ID 8087:0024 Intel Corp. Integrated Rate Matching Hub
   Bus 002 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
   Bus 001 Device 002: ID 8087:0024 Intel Corp. Integrated Rate Matching Hub
   Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
  MachineType: LENOVO 4291WJF
  MarkForUpload: True
  ProcFB: 0 inteldrmfb
  ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-3.11.0-15-generic root=UUID=36079681-53fc-4ca2-80ac-98321c07e8d2 ro quiet splash vt.handoff=7
  RelatedPackageVersions:
   linux-restricted-modules-3.11.0-15-generic N/A
   linux-backports-modules-3.11.0-15-generic  N/A
   linux-firmware                             1.116
  RfKill:
   0: phy0: Wireless LAN
    Soft blocked: no
    Hard blocked: no
  SourcePackage: linux
  UpgradeStatus: Upgraded to saucy on 2013-10-17 (66 days ago)
  WifiSyslog:

  dmi.bios.date: 05/31/2011
  dmi.bios.vendor: LENOVO
  dmi.bios.version: 8DET47WW (1.17 )
  dmi.board.asset.tag: Not Available
  dmi.board.name: 4291WJF
  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:bvr8DET47WW(1.17):bd05/31/2011:svnLENOVO:pn4291WJF:pvrThinkPadX220:rvnLENOVO:rn4291WJF:rvrNotAvailable:cvnLENOVO:ct10:cvrNotAvailable:
  dmi.product.name: 4291WJF
  dmi.product.version: ThinkPad X220
  dmi.sys.vendor: LENOVO
  ---
  ApportVersion: 2.12.7-0ubuntu6
  Architecture: amd64
  AudioDevicesInUse:
   USER        PID ACCESS COMMAND
   /dev/snd/controlC0:  ubuntu     2713 F.... pulseaudio
  CasperVersion: 1.336ubuntu1
  CurrentDesktop: Unity
  DistroRelease: Ubuntu 14.04
  LiveMediaBuild: Ubuntu 14.04 LTS "Trusty Tahr" - Alpha amd64 (20140109)
  Lsusb:
   Bus 002 Device 002: ID 8087:0024 Intel Corp. Integrated Rate Matching Hub
   Bus 002 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
   Bus 001 Device 003: ID 090c:1000 Silicon Motion, Inc. - Taiwan (formerly Feiya Technology Corp.) Flash Drive
   Bus 001 Device 002: ID 8087:0024 Intel Corp. Integrated Rate Matching Hub
   Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
  MachineType: LENOVO 4291WJF
  MarkForUpload: True
  Package: linux (not installed)
  ProcFB: 0 inteldrmfb
  ProcKernelCmdLine: file=/cdrom/preseed/username.seed boot=casper initrd=/casper/initrd.lz quiet splash -- maybe-ubiquity
  ProcVersionSignature: Ubuntu 3.13.0-1.16-generic 3.13.0-rc7
  RelatedPackageVersions:
   linux-restricted-modules-3.13.0-1-generic N/A
   linux-backports-modules-3.13.0-1-generic  N/A
   linux-firmware                            1.119
  RfKill:
   0: phy0: Wireless LAN
    Soft blocked: no
    Hard blocked: no
  Tags:  trusty
  Uname: Linux 3.13.0-1-generic x86_64
  UpgradeStatus: No upgrade log present (probably fresh install)
  UserGroups: adm cdrom dip lpadmin plugdev sambashare sudo
  dmi.bios.date: 07/18/2013
  dmi.bios.vendor: LENOVO
  dmi.bios.version: 8DET69WW (1.39 )
  dmi.board.asset.tag: Not Available
  dmi.board.name: 4291WJF
  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:bvr8DET69WW(1.39):bd07/18/2013:svnLENOVO:pn4291WJF:pvrThinkPadX220:rvnLENOVO:rn4291WJF:rvrNotAvailable:cvnLENOVO:ct10:cvrNotAvailable:
  dmi.product.name: 4291WJF
  dmi.product.version: ThinkPad X220
  dmi.sys.vendor: LENOVO

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