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[Elmar Pruesse <epruesse@xxxxxxxxxxxxx>]

Quite possible. I'm running it now. No change though. I also tried the
"intel graphics driver" packages
(https://download.01.org/gfx/ubuntu/13.04/main), no change either.

It might be worth noting that whatever is going over the DisplayPort
seems to "crash" my monitor. When the issue occured with 12.04 I would
have to power cycle it. Also, after the issue occurs, the monitor will
no longer go into "idle" mode (as per status led) even if the DP cable
is disconnected. I can no longer turn it of or switch to VGA or DVI.

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

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

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https://bugs.launchpad.net/bugs/1239358

Title:
  [Lenovo x220] display port stopped working after move to 13.04

Status in “linux” package in Ubuntu:
  Confirmed

Bug description:
  I get a blank (turned off) display on an Eizo monitor connected via
  DisplayPort to a Lenovo x220.

  The display works on 12.10 and does work while booting. As soon as X
  starts, the display is gone. Xrandr does show it and it can be
  configured. The screenshot tool shows entire area correctly. But
  nothing appears on the screen. Reconnecting the cable does the usual
  flicker, as does power cycling the monitor. The display stays blank.

  On 12.10 something similar occurred intermittently. After closing the
  notebook lid, the monitor had to be powercycled (re-plugging the cable
  did not help).

  ProblemType: Bug
  DistroRelease: Ubuntu 13.04
  Package: linux-image-3.8.0-31-generic 3.8.0-31.46
  ProcVersionSignature: Ubuntu 3.8.0-31.46-generic 3.8.13.8
  Uname: Linux 3.8.0-31-generic x86_64
  ApportVersion: 2.9.2-0ubuntu8
  Architecture: amd64
  AudioDevicesInUse: Error: command ['fuser', '-v', '/dev/snd/controlC0', '/dev/snd/hwC0D0', '/dev/snd/hwC0D3', '/dev/snd/pcmC0D0c', '/dev/snd/pcmC0D0p', '/dev/snd/pcmC0D3p', '/dev/snd/pcmC0D7p', '/dev/snd/pcmC0D8p', '/dev/snd/by-path', '/dev/snd/controlC29', '/dev/snd/seq', '/dev/snd/timer'] failed with exit code 1:
  Date: Sun Oct 13 16:20:33 2013
  HibernationDevice: RESUME=UUID=23a2a205-96a5-40bb-9f5f-97e7b8c1dd5d
  InstallationDate: Installed on 2013-10-13 (0 days ago)
  InstallationMedia: Ubuntu 13.04 "Raring Ringtail" - Release amd64 (20130424)
  MachineType: LENOVO 4290G51
  MarkForUpload: True
  ProcFB: 0 inteldrmfb
  ProcKernelCmdLine: BOOT_IMAGE=/vmlinuz-3.8.0-31-generic root=/dev/mapper/vg-u1304 ro quiet splash vt.handoff=7
  PulseList: Error: command ['pacmd', 'list'] failed with exit code 1: No PulseAudio daemon running, or not running as session daemon.
  RelatedPackageVersions:
   linux-restricted-modules-3.8.0-31-generic N/A
   linux-backports-modules-3.8.0-31-generic  N/A
   linux-firmware                            1.106
  SourcePackage: linux
  UpgradeStatus: No upgrade log present (probably fresh install)
  dmi.bios.date: 10/22/2012
  dmi.bios.vendor: LENOVO
  dmi.bios.version: 8DET66WW (1.36 )
  dmi.board.asset.tag: Not Available
  dmi.board.name: 4290G51
  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:bvr8DET66WW(1.36):bd10/22/2012:svnLENOVO:pn4290G51:pvrThinkPadX220:rvnLENOVO:rn4290G51:rvrNotAvailable:cvnLENOVO:ct10:cvrNotAvailable:
  dmi.product.name: 4290G51
  dmi.product.version: ThinkPad X220
  dmi.sys.vendor: LENOVO

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