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[Anton Piatek <anton@xxxxxxxxxxxx>]

Possibly related to +1560524

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https://bugs.launchpad.net/bugs/1589397

Title:
  kernel panic connecting display port to Dell Latitude E7470

Status in linux package in Ubuntu:
  New

Bug description:
  Connecting an external Display Port screen wither via the dell E-Port
  plus or directly via the miniDP causes a kernel panic. The crash is
  not always immediate, if the internal screen is disabled when docked,
  then the external screen may work, though undocking and docking a
  second time usually crashes it.

  Kernels crashing for me are 4.4.0-21-generic and 4.4.0-22-generic.

  Testing with the mainline kernel linux-
  image-4.4.12-040412-generic=4.4.12-040412.201606011712 has not yet
  caused the panic

  ProblemType: Bug
  DistroRelease: Ubuntu 16.04
  Package: linux-image-4.4.0-22-generic 4.4.0-22.40
  ProcVersionSignature: Ubuntu 4.4.0-22.40-generic 4.4.8
  Uname: Linux 4.4.0-22-generic x86_64
  ApportVersion: 2.20.1-0ubuntu2.1
  Architecture: amd64
  AudioDevicesInUse:
   USER        PID ACCESS COMMAND
   /dev/snd/controlC0:  anton      1885 F.... pulseaudio
  CurrentDesktop: Unity
  Date: Mon Jun  6 08:25:23 2016
  InstallationDate: Installed on 2016-06-01 (4 days ago)
  InstallationMedia: Ubuntu 16.04 LTS "Xenial Xerus" - Release amd64 (20160420.1)
  Lsusb:
   Bus 002 Device 001: ID 1d6b:0003 Linux Foundation 3.0 root hub
   Bus 001 Device 004: ID 8087:0a2b Intel Corp. 
   Bus 001 Device 003: ID 0a5c:5800 Broadcom Corp. BCM5880 Secure Applications Processor
   Bus 001 Device 002: ID 1bcf:28b8 Sunplus Innovation Technology Inc. 
   Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
  MachineType: Dell Inc. Latitude E7470
  ProcFB: 0 inteldrmfb
  ProcKernelCmdLine: BOOT_IMAGE=/vmlinuz-4.4.0-22-generic root=UUID=7bebd315-73de-4106-9fef-07139edd58f2 ro rootflags=subvol=@ quiet splash vt.handoff=7
  RelatedPackageVersions:
   linux-restricted-modules-4.4.0-22-generic N/A
   linux-backports-modules-4.4.0-22-generic  N/A
   linux-firmware                            1.157
  SourcePackage: linux
  UpgradeStatus: No upgrade log present (probably fresh install)
  dmi.bios.date: 04/18/2016
  dmi.bios.vendor: Dell Inc.
  dmi.bios.version: 1.5.3
  dmi.board.name: 0T6HHJ
  dmi.board.vendor: Dell Inc.
  dmi.board.version: A00
  dmi.chassis.type: 9
  dmi.chassis.vendor: Dell Inc.
  dmi.modalias: dmi:bvnDellInc.:bvr1.5.3:bd04/18/2016:svnDellInc.:pnLatitudeE7470:pvr:rvnDellInc.:rn0T6HHJ:rvrA00:cvnDellInc.:ct9:cvr:
  dmi.product.name: Latitude E7470
  dmi.sys.vendor: Dell Inc.

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