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[Joseph Salisbury <joseph.salisbury@xxxxxxxxxxxxx>]

I built the next test kernel, up to the following commit:
b44a3d2a85c64208a57362a1728efb58a6556cd6

The test kernel can be downloaded from:
http://kernel.ubuntu.com/~jsalisbury/lp1547619

Can you test that kernel and report back if it has the bug or not? I
will build the next test kernel based on your test results.

Thanks in advance

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https://bugs.launchpad.net/bugs/1547619

Title:
  Intermittent screen blinking with 4k external mini display port with
  4.4 kernels

Status in linux package in Ubuntu:
  In Progress
Status in linux source package in Xenial:
  In Progress

Bug description:
  When using an external 4K monitor plugged into the mini display port on my Dell XPS 13 9343 using both the laptop screen and the external monitor (external monitor is left and laptop screen right), when using all of the following kernels:
  4.4.0-2.16-generic
  4.4.0-4.19-generic
  4.4.0-6.21-generic
  4.4.0-7.22-generic

  the external monitor will sometimes blink off for about a second or
  two, then back on. What is weird is this seems to only happen when
  typing into a gnome-terminal as opposed to firefox or evolution.
  Simply changing to a gnome-terminal and typing into it doesn't cause
  the blinking, but it might happen immediately or it might take several
  minutes.

  4.3.0-7.18-generic worked fine and I can go hours and hours in a
  gnome-terminal with no issues.

  ProblemType: Bug
  DistroRelease: Ubuntu 16.04
  Package: linux-image-4.4.0-6-generic 4.4.0-6.21
  ProcVersionSignature: Ubuntu 4.4.0-6.21-generic 4.4.1
  Uname: Linux 4.4.0-6-generic x86_64
  ApportVersion: 2.20-0ubuntu3
  Architecture: amd64
  AudioDevicesInUse:
   USER        PID ACCESS COMMAND
   /dev/snd/controlC2:  jamie      5882 F.... pulseaudio
   /dev/snd/controlC1:  jamie      5882 F.... pulseaudio
   /dev/snd/controlC0:  jamie      5882 F.... pulseaudio
  CurrentDesktop: Unity
  Date: Fri Feb 19 12:09:28 2016
  HibernationDevice: RESUME=UUID=27fa6713-c8c2-4eb8-9766-ba6918bc1cfb
  InstallationDate: Installed on 2015-06-13 (250 days ago)
  InstallationMedia: Ubuntu 15.04 "Vivid Vervet" - Release amd64 (20150422)
  MachineType: Dell Inc. XPS 13 9343
  ProcFB: 0 inteldrmfb
  ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-4.4.0-6-generic.efi.signed root=UUID=7bc4dcd2-0bd8-4e42-b8b7-9f1ed6b8a3e9 ro libata.force=noncq kaslr quiet splash vt.handoff=7
  RelatedPackageVersions:
   linux-restricted-modules-4.4.0-6-generic N/A
   linux-backports-modules-4.4.0-6-generic  N/A
   linux-firmware                           1.156
  SourcePackage: linux
  UpgradeStatus: Upgraded to xenial on 2016-01-12 (38 days ago)
  dmi.bios.date: 11/11/2015
  dmi.bios.vendor: Dell Inc.
  dmi.bios.version: A07
  dmi.board.name: 0310JH
  dmi.board.vendor: Dell Inc.
  dmi.board.version: A00
  dmi.chassis.type: 9
  dmi.chassis.vendor: Dell Inc.
  dmi.modalias: dmi:bvnDellInc.:bvrA07:bd11/11/2015:svnDellInc.:pnXPS139343:pvr:rvnDellInc.:rn0310JH:rvrA00:cvnDellInc.:ct9:cvr:
  dmi.product.name: XPS 13 9343
  dmi.sys.vendor: Dell Inc.

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