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[Hans-Peter Schadler <1165965@xxxxxxxxxxxxxxxxxx>]

I can also confirm that it works more reliable with 3.12.0-031200rc6-generic (and 3.12.0-031200-generic), but it is still not perfect. I would have to ability to test it on two cases where it does not work. Both are beamers (different models, I have to check which one exactly) and both are connected over very long VGA cables.
This is still an annoying bug, at least there was some progress so that it started to work again for most monitors I tried. Now it would be nice to get it working on beamers too.

Can I do something to test this? I have checked the dmesg messages and there are no messages like
"[drm:intel_dp_i2c_aux_ch] *ERROR* too many retries, giving up"
what happened before kernel 3.12 (and maybe kernel 3.11.4). From xrandr output I noticed, that the DP1 connector is shown as disconnected and also no modes are shown (before kernel 3.12 there was sometimes a resolution of the external monitor detected).

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https://bugs.launchpad.net/bugs/1165965

Title:
  External display stopped working

Status in “linux” package in Ubuntu:
  Confirmed

Bug description:
  After upgrading to 13.04 beta, my external monitor is no longer
  detected/driven. This works perfectly under 12.10, and is therefore a
  major regression impacting common use cases.

  When the Display Port/VGA adapter is plugged in dmesg reports 15 instances of:
      [drm:intel_dp_i2c_aux_ch] *ERROR* too many retries, giving up

  Hardware: MacBook Air 2012
  Display configuration: Apple Display Port to VGA adaptor
  Ubuntu version: 13.04 beta.
  --- 
  ApportVersion: 2.9.2-0ubuntu5
  Architecture: amd64
  DistroRelease: Ubuntu 13.04
  EcryptfsInUse: Yes
  InstallationDate: Installed on 2012-07-24 (258 days ago)
  InstallationMedia: Ubuntu 12.04 LTS "Precise Pangolin" - Release amd64 (20120425)
  MarkForUpload: True
  Package: linux (not installed)
  Tags:  raring
  Uname: Linux 3.9.0-030900rc6-generic x86_64
  UnreportableReason: The running kernel is not an Ubuntu kernel
  UpgradeStatus: Upgraded to raring on 2013-04-07 (2 days ago)
  UserGroups: adm cdrom dip lpadmin plugdev sambashare sudo
  --- 
  ApportVersion: 2.12.5-0ubuntu2
  Architecture: amd64
  AudioDevicesInUse:
   USER        PID ACCESS COMMAND
   /dev/snd/controlC0:  mwp        3892 F.... pulseaudio
  DistroRelease: Ubuntu 13.10
  EcryptfsInUse: Yes
  InstallationDate: Installed on 2012-07-24 (453 days ago)
  InstallationMedia: Ubuntu 12.04 LTS "Precise Pangolin" - Release amd64 (20120425)
  MachineType: Apple Inc. MacBookAir5,2
  MarkForUpload: True
  NonfreeKernelModules: wl
  Package: linux (not installed)
  ProcFB: 0 inteldrmfb
  ProcKernelCmdLine: BOOT_IMAGE=/vmlinuz-3.11.0-12-generic root=UUID=6556813f-c877-4988-bde5-24ac4ec74444 ro nointremap quiet splash i915.i915_enable_rc6=1 vt.handoff=7
  ProcVersionSignature: Ubuntu 3.11.0-12.19-generic 3.11.3
  RelatedPackageVersions:
   linux-restricted-modules-3.11.0-12-generic N/A
   linux-backports-modules-3.11.0-12-generic  N/A
   linux-firmware                             1.116
  Tags:  saucy
  Uname: Linux 3.11.0-12-generic x86_64
  UpgradeStatus: Upgraded to saucy on 2013-10-21 (0 days ago)
  UserGroups: adm cdrom dip lpadmin plugdev sambashare sudo
  dmi.bios.date: 05/22/2012
  dmi.bios.vendor: Apple Inc.
  dmi.bios.version: MBA51.88Z.00EF.B00.1205221442
  dmi.board.asset.tag: Base Board Asset Tag#
  dmi.board.name: Mac-2E6FAB96566FE58C
  dmi.board.vendor: Apple Inc.
  dmi.board.version: MacBookAir5,2
  dmi.chassis.type: 10
  dmi.chassis.vendor: Apple Inc.
  dmi.chassis.version: Mac-2E6FAB96566FE58C
  dmi.modalias: dmi:bvnAppleInc.:bvrMBA51.88Z.00EF.B00.1205221442:bd05/22/2012:svnAppleInc.:pnMacBookAir5,2:pvr1.0:rvnAppleInc.:rnMac-2E6FAB96566FE58C:rvrMacBookAir5,2:cvnAppleInc.:ct10:cvrMac-2E6FAB96566FE58C:
  dmi.product.name: MacBookAir5,2
  dmi.product.version: 1.0
  dmi.sys.vendor: Apple Inc.

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