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[Bug 1501993] Re: drivers/gpu/drm/i915/intel_display.c:12326 check_crtc_state+0x2c5/0x440 [i915]()


Martin Smith, given you are the only one reporting this, and you won't
be providing any further detail, let this be closed. However, if you
have the opportunity to resume debugging, please feel free to reopen.
Despite this, given this is already fixed upstream, more than likely the
fix will flow down into the stable update channels.

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

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  check_crtc_state+0x2c5/0x440 [i915]()

Status in linux package in Ubuntu:

Bug description:
  I'm seeing a kernel hang when I 'dock' my laptop into my docking station; this happens with 4.2, specifically with:

  At this point I lose video, and can't do much else without a hard
  reboot back to linux-image-extra-3.19.0-30-generic.

  ApportVersion: 2.19-0ubuntu1
  Architecture: amd64
   /dev/snd/controlC1:  mart6985   1824 F.... pulseaudio
   /dev/snd/controlC0:  mart6985   1824 F.... pulseaudio
  DistroRelease: Ubuntu 15.10
  HibernationDevice: RESUME=UUID=ef25a70d-08ea-4cfb-a7a0-ab30671365cc
  InstallationDate: Installed on 2014-07-02 (456 days ago)
  InstallationMedia: Ubuntu 14.04 LTS "Trusty Tahr" - Release amd64 (20140417)
  MachineType: Dell Inc. Latitude E7440
  Package: linux (not installed)
  ProcFB: 0 inteldrmfb
  ProcKernelCmdLine: BOOT_IMAGE=/vmlinuz-3.19.0-30-generic root=/dev/mapper/ubuntu--vg-root ro quiet splash vt.handoff=7
  ProcVersionSignature: Ubuntu 3.19.0-30.33-generic 3.19.8-ckt6
  PulseList: Error: command ['pacmd', 'list'] failed with exit code 1: No PulseAudio daemon running, or not running as session daemon.
   linux-restricted-modules-3.19.0-30-generic N/A
   linux-backports-modules-3.19.0-30-generic  N/A
   linux-firmware                             1.148
  Tags:  wily
  Uname: Linux 3.19.0-30-generic x86_64
  UpgradeStatus: Upgraded to wily on 2015-09-29 (3 days ago)

  _MarkForUpload: True
  dmi.bios.date: 02/02/2015
  dmi.bios.vendor: Dell Inc.
  dmi.bios.version: A14
  dmi.board.name: 03HFCG
  dmi.board.vendor: Dell Inc.
  dmi.board.version: A00
  dmi.chassis.type: 9
  dmi.chassis.vendor: Dell Inc.
  dmi.modalias: dmi:bvnDellInc.:bvrA14:bd02/02/2015:svnDellInc.:pnLatitudeE7440:pvr01:rvnDellInc.:rn03HFCG:rvrA00:cvnDellInc.:ct9:cvr:
  dmi.product.name: Latitude E7440
  dmi.product.version: 01
  dmi.sys.vendor: Dell Inc.

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