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[shoeman <fleck@xxxxxxxxxxxx>]

same issue with Asus ux21a,  3.16.0-24-generic:

dmesg | grep voltage
[    2.659756] [drm:intel_dp_start_link_train] *ERROR* too many voltage retries, give up
[  936.220837] [drm:intel_dp_start_link_train] *ERROR* too many voltage retries, give up
[ 3230.334988] [drm:intel_dp_start_link_train] *ERROR* too many voltage retries, give up
[ 4568.440454] [drm:intel_dp_start_link_train] *ERROR* too many voltage retries, give up

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Touch seeded packages, which is subscribed to xorg in Ubuntu.
https://bugs.launchpad.net/bugs/1359117

Title:
  lightdm and xorg fails to start after kernel update, voltage errors

Status in “xorg” package in Ubuntu:
  Confirmed

Bug description:
  Hardware: ASUS UX32VD (zenbook prime)
  Software: Ubuntu 14.04

  I see following errors on dmesg after kernel updated to 3.13.0-34:
  [drm:intel_dp_start_link_train] *ERROR* too many voltage retries, give up

  Lightdm won't start, startx did not help also.

  Tried linux-image-3.16.1 from Utopic - same issue.
  Last working kernel where there is no such problem: 3.13.0-32-generic

  Upstream bug reports:
  https://bugs.freedesktop.org/show_bug.cgi?id=70117
  https://bugzilla.kernel.org/show_bug.cgi?id=74931

  ProblemType: Bug
  DistroRelease: Ubuntu 14.04
  Package: xorg 1:7.7+1ubuntu8
  ProcVersionSignature: Ubuntu 3.13.0-32.57-generic 3.13.11.4
  Uname: Linux 3.13.0-32-generic x86_64
  .tmp.unity.support.test.0:
   
  ApportVersion: 2.14.1-0ubuntu3.3
  Architecture: amd64
  CompizPlugins: No value set for `/apps/compiz-1/general/screen0/options/active_plugins'
  CompositorRunning: compiz
  CompositorUnredirectDriverBlacklist: '(nouveau|Intel).*Mesa 8.0'
  CompositorUnredirectFSW: true
  CurrentDesktop: Unity
  Date: Wed Aug 20 12:57:32 2014
  DistUpgraded: Fresh install
  DistroCodename: trusty
  DistroVariant: ubuntu
  EcryptfsInUse: Yes
  ExtraDebuggingInterest: Yes
  GraphicsCard:
   Intel Corporation 3rd Gen Core processor Graphics Controller [8086:0166] (rev 09) (prog-if 00 [VGA controller])
     Subsystem: ASUSTeK Computer Inc. Device [1043:1507]
     Subsystem: ASUSTeK Computer Inc. GeForce GT 620M [1043:1507]
  MachineType: ASUSTeK COMPUTER INC. UX32VD
  ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-3.13.0-32-generic.efi.signed root=UUID=69b256f1-59c3-4193-a1e0-b7c0e333cfbd ro quiet splash pcie_aspm=force drm.vblankoffdelay=1 i915.semaphores=1 nmi_watchdog=0 vt.handoff=7
  SourcePackage: xorg
  Symptom: display
  UpgradeStatus: No upgrade log present (probably fresh install)
  dmi.bios.date: 01/29/2013
  dmi.bios.vendor: American Megatrends Inc.
  dmi.bios.version: UX32VD.214
  dmi.board.asset.tag: ATN12345678901234567
  dmi.board.name: UX32VD
  dmi.board.vendor: ASUSTeK COMPUTER INC.
  dmi.board.version: 1.0
  dmi.chassis.asset.tag: No Asset Tag
  dmi.chassis.type: 10
  dmi.chassis.vendor: ASUSTeK COMPUTER INC.
  dmi.chassis.version: 1.0
  dmi.modalias: dmi:bvnAmericanMegatrendsInc.:bvrUX32VD.214:bd01/29/2013:svnASUSTeKCOMPUTERINC.:pnUX32VD:pvr1.0:rvnASUSTeKCOMPUTERINC.:rnUX32VD:rvr1.0:cvnASUSTeKCOMPUTERINC.:ct10:cvr1.0:
  dmi.product.name: UX32VD
  dmi.product.version: 1.0
  dmi.sys.vendor: ASUSTeK COMPUTER INC.
  version.compiz: compiz 1:0.9.11.2+14.04.20140714-0ubuntu1
  version.ia32-libs: ia32-libs N/A
  version.libdrm2: libdrm2 2.4.52-1
  version.libgl1-mesa-dri: libgl1-mesa-dri 10.1.3-0ubuntu0.1
  version.libgl1-mesa-dri-experimental: libgl1-mesa-dri-experimental N/A
  version.libgl1-mesa-glx: libgl1-mesa-glx 10.1.3-0ubuntu0.1
  version.xserver-xorg-core: xserver-xorg-core 2:1.15.1-0ubuntu2
  version.xserver-xorg-input-evdev: xserver-xorg-input-evdev 1:2.8.2-1ubuntu2
  version.xserver-xorg-video-ati: xserver-xorg-video-ati 1:7.3.0-1ubuntu3.1
  version.xserver-xorg-video-intel: xserver-xorg-video-intel 2:2.99.910-0ubuntu1
  version.xserver-xorg-video-nouveau: xserver-xorg-video-nouveau N/A
  xserver.bootTime: Wed Aug 20 11:19:17 2014
  xserver.configfile: default
  xserver.errors:
   
  xserver.logfile: /var/log/Xorg.0.log
  xserver.outputs:
   product id                                4931 
   vendor                                     CMN
  xserver.version: 2:1.15.1-0ubuntu2

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