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[Andreas Schildbach <launchpad.net@xxxxxxxxxxxxx>]

I bisected the bug down to this commit:

commit fdbc3b1f639bb2cbfb32c612b2699e0ba373317d
Author: Jani Nikula <jani.nikula@xxxxxxxxx>
Date:   Tue Nov 12 17:10:13 2013 +0200

    drm/i915/dp: set sink to power down mode on dp disable


FWIW, here is the full bisect log:

$ git bisect log
# bad: [52cd2b0342665668e7d3806d4a0b2ff837651690] UBUNTU: Ubuntu-3.13.0-0.2
# good: [4f57e47bab90529e40d11878ba8b5f429cfa1d95] UBUNTU: Ubuntu-3.12.0-8.16
git bisect start 'Ubuntu-3.13.0-0.2' 'Ubuntu-3.12.0-8.16'
# good: [5e01dc7b26d9f24f39abace5da98ccbd6a5ceb52] Linux 3.12
git bisect good 5e01dc7b26d9f24f39abace5da98ccbd6a5ceb52
# good: [5cbb3d216e2041700231bcfc383ee5f8b7fc8b74] Merge branch 'akpm' (patches from Andrew Morton)
git bisect good 5cbb3d216e2041700231bcfc383ee5f8b7fc8b74
# good: [d8fe4acc88da8fbbe360b6592c9d0abbb85117dc] Merge branch 'akpm' (patch-bomb from Andrew Morton)
git bisect good d8fe4acc88da8fbbe360b6592c9d0abbb85117dc
# good: [73d75ba99e3bdd627275afd3fe48cc933723084b] Merge tag 'sound-fix-3.13-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/tiwai/sound
git bisect good 73d75ba99e3bdd627275afd3fe48cc933723084b
# good: [e6d69a60b77a6ea8d5f9d41765c7571bb8d45531] Merge branch 'next' of git://git.infradead.org/users/vkoul/slave-dma
git bisect good e6d69a60b77a6ea8d5f9d41765c7571bb8d45531
# good: [d2c2ad54c485e7ebca5c0b7e4a7b2c56103fda38] Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net
git bisect good d2c2ad54c485e7ebca5c0b7e4a7b2c56103fda38
# bad: [26b265cd29dde56bf0901c421eabc7ae815f38c4] Merge git://git.kernel.org/pub/scm/linux/kernel/git/herbert/crypto-2.6
git bisect bad 26b265cd29dde56bf0901c421eabc7ae815f38c4
# bad: [aecde27c4fc4939f7c16ae13645f896438190567] Merge branch 'drm-fixes' of git://people.freedesktop.org/~airlied/linux
git bisect bad aecde27c4fc4939f7c16ae13645f896438190567
# good: [b0e3636f656c98bdeded5aaa78601e3256b18d6d] Merge branch 'for-next' of git://git.kernel.org/pub/scm/linux/kernel/git/nab/target-pending
git bisect good b0e3636f656c98bdeded5aaa78601e3256b18d6d
# bad: [cf969677945e6e19810d616873617320da002e32] Merge tag 'drm-intel-fixes-2013-11-20' of git://people.freedesktop.org/~danvet/drm-intel into drm-fixes
git bisect bad cf969677945e6e19810d616873617320da002e32
# good: [7272c9d2286525d4c6bce788243cf2b6f306d15c] drm/radeon: hook up backlight functions for CI and KV family.
git bisect good 7272c9d2286525d4c6bce788243cf2b6f306d15c
# bad: [7a495cfd9b5f82c40608f26fe523dc9e8533dc14] drm/i915/tv: add ->get_config callback
git bisect bad 7a495cfd9b5f82c40608f26fe523dc9e8533dc14
# bad: [f69e515699d8e9b1c25dcfe1c4c6f435087495d2] i915: Use 120MHz LVDS SSC clock for gen5/gen6/gen7
git bisect bad f69e515699d8e9b1c25dcfe1c4c6f435087495d2
# bad: [7bd40c16ccb2cb6877dd00b0e66249c171e6fa43] x86/early quirk: use gen6 stolen detection for VLV
git bisect bad 7bd40c16ccb2cb6877dd00b0e66249c171e6fa43
# bad: [fdbc3b1f639bb2cbfb32c612b2699e0ba373317d] drm/i915/dp: set sink to power down mode on dp disable
git bisect bad fdbc3b1f639bb2cbfb32c612b2699e0ba373317d
# first bad commit: [fdbc3b1f639bb2cbfb32c612b2699e0ba373317d] drm/i915/dp: set sink to power down mode on dp disable


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

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https://bugs.launchpad.net/bugs/1296224

Title:
  Horrible noise via DisplayPort [regression]

Status in linux package in Ubuntu:
  Confirmed

Bug description:
  This issue has been present and fixed two years ago and with Trusty
  Tahr it re-appeared:

  When logging in and my display is extended to two monitors, and also
  when the screen blanks, I get 3-5 seconds of horrible noise via
  DisplayPort audio out.

  The noise is loud enough to damage ears and loudspeakers, if volume
  has been set to a normal listening level.

  ProblemType: Bug
  DistroRelease: Ubuntu 14.04
  Package: xserver-xorg-video-intel 2:2.99.910-0ubuntu1
  ProcVersionSignature: Ubuntu 3.13.0-18.38-generic 3.13.6
  Uname: Linux 3.13.0-18-generic x86_64
  .tmp.unity.support.test.0:
   
  ApportVersion: 2.13.3-0ubuntu1
  Architecture: amd64
  CompizPlugins: [core,composite,opengl,compiztoolbox,decor,vpswitch,snap,mousepoll,resize,place,move,wall,grid,regex,imgpng,session,gnomecompat,animation,fade,unitymtgrabhandles,workarounds,scale,expo,ezoom,unityshell]
  CompositorRunning: compiz
  CompositorUnredirectDriverBlacklist: '(nouveau|Intel).*Mesa 8.0'
  CompositorUnredirectFSW: true
  CurrentDesktop: Unity
  Date: Sun Mar 23 10:18:08 2014
  DistUpgraded: 2014-01-03 23:25:11,434 DEBUG enabling apt cron job
  DistroCodename: trusty
  DistroVariant: ubuntu
  ExtraDebuggingInterest: Yes
  GraphicsCard:
   Intel Corporation Core Processor Integrated Graphics Controller [8086:0046] (rev 02) (prog-if 00 [VGA controller])
     Subsystem: Lenovo Device [17aa:21c1]
  InstallationDate: Installed on 2011-08-05 (960 days ago)
  InstallationMedia: Ubuntu 11.10 "Oneiric Ocelot" - Alpha amd64 (20110803.1)
  MachineType: LENOVO 29123AG
  ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-3.13.0-18-generic root=UUID=b9fb2d9e-d248-4294-bd6b-9abe27dfcea4 ro quiet splash
  SourcePackage: xserver-xorg-video-intel
  UpgradeStatus: Upgraded to trusty on 2014-01-03 (78 days ago)
  dmi.bios.date: 10/11/2012
  dmi.bios.vendor: LENOVO
  dmi.bios.version: 6UET70WW (1.50 )
  dmi.board.name: 29123AG
  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:bvr6UET70WW(1.50):bd10/11/2012:svnLENOVO:pn29123AG:pvrThinkPadT410s:rvnLENOVO:rn29123AG:rvrNotAvailable:cvnLENOVO:ct10:cvrNotAvailable:
  dmi.product.name: 29123AG
  dmi.product.version: ThinkPad T410s
  dmi.sys.vendor: LENOVO
  version.compiz: compiz 1:0.9.11+14.04.20140320.1-0ubuntu1
  version.ia32-libs: ia32-libs N/A
  version.libdrm2: libdrm2 2.4.52-1
  version.libgl1-mesa-dri: libgl1-mesa-dri 10.1.0-1ubuntu1
  version.libgl1-mesa-dri-experimental: libgl1-mesa-dri-experimental N/A
  version.libgl1-mesa-glx: libgl1-mesa-glx 10.1.0-1ubuntu1
  version.xserver-xorg-core: xserver-xorg-core 2:1.15.0-1ubuntu7
  version.xserver-xorg-input-evdev: xserver-xorg-input-evdev 1:2.8.2-1ubuntu2
  version.xserver-xorg-video-ati: xserver-xorg-video-ati 1:7.3.0-1ubuntu3
  version.xserver-xorg-video-intel: xserver-xorg-video-intel 2:2.99.910-0ubuntu1
  version.xserver-xorg-video-nouveau: xserver-xorg-video-nouveau 1:1.0.10-1ubuntu2
  xserver.bootTime: Sun Mar 23 10:09:13 2014
  xserver.configfile: default
  xserver.errors:
   N-Trig Pen stylus: Invalid type 'cursor' for this device.
   N-Trig Pen stylus: Invalid type 'touch' for this device.
  xserver.logfile: /var/log/Xorg.0.log
  xserver.outputs:
   product id                               16438 
   vendor                                     LEN
  xserver.version: 2:1.15.0-1ubuntu7

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