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[pureblood <1314213@xxxxxxxxxxxxxxxxxx>]

Okay, I did not think about trying that. I will update the BIOS (as per
previous post, I am currently using "8DET64WW (1.34 ) 08/31/2012") over
the weekend and provide an update.

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https://bugs.launchpad.net/bugs/1314213

Title:
  [Lenovo ThinkPad X220] External DP1 monitor extremely unstable since
  upgrade to 14.04

Status in “linux” package in Ubuntu:
  Incomplete

Bug description:
  Since upgrade to 14.04, the external display on DP1 is extremely
  unstable. I get constant "[drm:intel_dp_i2c_aux_ch] *ERROR* too many
  retries, giving up" messages over dmesg. I used to get those with
  13.10, but there was no stability issue. Once the laptop (Lenovo X220)
  is connected to the monitor (resolution is 2560x1600), if I run any
  program like xrandr or unity-control-center, the system immediately
  reverts from the external display to the laptop display, and often
  crashes becoming unresponsive. Every time I run xrandr or unity-
  control-center, it triggers 20 "[drm:intel_dp_i2c_aux_ch] *ERROR* too
  many retries, giving up" messages in dmesg and if I am using the
  external monitor it further triggers a reproducible crash. It is
  possible that this might be related to the DVI->DP adapter I am using.
  Due to an unresolved bug, the correct EDID for the monitor is not
  recognized, and I have to manually add that after each boot.

  ProblemType: Bug
  DistroRelease: Ubuntu 14.04
  Package: linux-image-3.13.0-24-generic 3.13.0-24.46
  ProcVersionSignature: Ubuntu 3.13.0-24.46-generic 3.13.9
  Uname: Linux 3.13.0-24-generic x86_64
  ApportVersion: 2.14.1-0ubuntu3
  Architecture: amd64
  AudioDevicesInUse:
   USER        PID ACCESS COMMAND
   /dev/snd/controlC0:  genovese   2538 F.... pulseaudio
  CurrentDesktop: Unity
  Date: Tue Apr 29 10:00:31 2014
  EcryptfsInUse: Yes
  InstallationDate: Installed on 2013-01-21 (463 days ago)
  InstallationMedia: Ubuntu 12.10 "Quantal Quetzal" - Release amd64 (20121017.5)
  MachineType: LENOVO 42872WU
  ProcFB: 0 inteldrmfb
  ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-3.13.0-24-generic root=UUID=1f880233-e827-4c00-b11a-2c7a4eb76497 ro quiet splash nomdmonddf nomdmonisw nomdmonddf nomdmonisw nomdmonddf nomdmonisw nomdmonddf nomdmonisw nomdmonddf nomdmonisw nomdmonddf nomdmonisw vt.handoff=7
  RelatedPackageVersions:
   linux-restricted-modules-3.13.0-24-generic N/A
   linux-backports-modules-3.13.0-24-generic  N/A
   linux-firmware                             1.127
  SourcePackage: linux
  UpgradeStatus: Upgraded to trusty on 2014-04-18 (10 days ago)
  dmi.bios.date: 08/31/2012
  dmi.bios.vendor: LENOVO
  dmi.bios.version: 8DET64WW (1.34 )
  dmi.board.asset.tag: Not Available
  dmi.board.name: 42872WU
  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:bvr8DET64WW(1.34):bd08/31/2012:svnLENOVO:pn42872WU:pvrThinkPadX220:rvnLENOVO:rn42872WU:rvrNotAvailable:cvnLENOVO:ct10:cvrNotAvailable:
  dmi.product.name: 42872WU
  dmi.product.version: ThinkPad X220
  dmi.sys.vendor: LENOVO

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