kernel-packages team mailing list archive

[Jamie Strandboge <jamie@xxxxxxxxxx>]

I have booted into this kernel:

$ cat /proc/version 
Linux version 4.3.0-040300rc5-generic (jsalisbury@gomeisa) (gcc version 5.2.1 20151010 (Ubuntu 5.2.1-22ubuntu2) ) #201605201447 SMP Fri May 20 18:50:00 UTC 2016

Since the bug doesn't always show itself right away, I will want to use
the kernel for at least several hours. I'll report back as soon as I see
the bug or after using the computer throughout the day.

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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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