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[Iyad Kandalaft <ik@xxxxxxxxx>]

I get the same behavior when connecting a new display via display link.
then I realised that the flickering occurs when changing resolution on
the built-in display without any external monitor.  do you have the same
issue.

I had everything working without problems a week ago but I'm not sure
what I've changed since.

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https://bugs.launchpad.net/bugs/1566410

Title:
  screen flickers indefinitely when connecting a display via USB-C

Status in linux package in Ubuntu:
  Confirmed

Bug description:
  Dell XPS 13 Skylake laptop, only external display port is adapter is
  via USB-C. When connecting any of the adapters I  have (eg USB-C to
  VGA, HDMI, DisplayPort, I tried all and the behavior is the same), the
  screen starts flickering as if trying to detect something, and then
  keeps doing this indefinitely. Mouse moves but windows don't react.
  Can switch to terminal and back with Ctrl-Alt-F1 etc.

  This only happens with Unity/Gnome. KDE and XFCE4 work fine, just
  detect the display.

  It would help greatly as a workaround if I could just disable the part
  of unity/gnome which tries to detect the new display and use xrandr
  instead (which, again, works fine with other desktops), but I could
  not figure out which program that is, or where it writes its logfiles.

  Using latest xenial packages.

  ProblemType: Bug
  DistroRelease: Ubuntu 16.04
  Package: unity 7.4.0+16.04.20160401.1-0ubuntu1
  Uname: Linux 4.4.6-040406-generic x86_64
  .tmp.unity.support.test.0:
   
  ApportVersion: 2.20.1-0ubuntu1
  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: Tue Apr  5 18:06:36 2016
  DistUpgraded: 2016-02-27 15:22:35,661 DEBUG enabling apt cron job
  DistroCodename: xenial
  DistroVariant: ubuntu
  DkmsStatus:
   virtualbox, 5.0.16, 4.4.0-16-generic, x86_64: installed
   virtualbox, 5.0.16, 4.4.6-040406-generic, x86_64: installed
   virtualbox, 5.0.16, 4.5.0-040500-generic, x86_64: installed
  GraphicsCard:
   Intel Corporation Sky Lake Integrated Graphics [8086:1926] (rev 0a) (prog-if 00 [VGA controller])
     Subsystem: Dell Skylake Integrated Graphics [1028:0704]
  InstallationDate: Installed on 2016-02-26 (39 days ago)
  InstallationMedia: Ubuntu 15.10 "Wily Werewolf" - Release amd64 (20151021)
  Lsusb:
   Bus 002 Device 001: ID 1d6b:0003 Linux Foundation 3.0 root hub
   Bus 001 Device 004: ID 0bda:5682 Realtek Semiconductor Corp. 
   Bus 001 Device 003: ID 04f3:20d0 Elan Microelectronics Corp. 
   Bus 001 Device 002: ID 0a5c:6412 Broadcom Corp. 
   Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
  MachineType: Dell Inc. XPS 13 9350
  ProcEnviron:
   LANGUAGE=en_US
   PATH=(custom, no user)
   XDG_RUNTIME_DIR=<set>
   LANG=en_US.UTF-8
   SHELL=/bin/bash
  ProcKernelCmdLine: BOOT_IMAGE=/vmlinuz-4.4.6-040406-generic root=/dev/mapper/ubuntu--vg-root ro quiet splash i915.enable_rc6=0 vt.handoff=7
  SourcePackage: unity
  UpgradeStatus: Upgraded to xenial on 2016-02-27 (38 days ago)
  dmi.bios.date: 03/01/2016
  dmi.bios.vendor: Dell Inc.
  dmi.bios.version: 1.3.3
  dmi.board.name: 09JHRY
  dmi.board.vendor: Dell Inc.
  dmi.board.version: A00
  dmi.chassis.type: 9
  dmi.chassis.vendor: Dell Inc.
  dmi.modalias: dmi:bvnDellInc.:bvr1.3.3:bd03/01/2016:svnDellInc.:pnXPS139350:pvr:rvnDellInc.:rn09JHRY:rvrA00:cvnDellInc.:ct9:cvr:
  dmi.product.name: XPS 13 9350
  dmi.sys.vendor: Dell Inc.
  upstart.unity-panel-service.log: (unity-panel-service:1483): Indicator-Appmenu-WARNING **: Already have a menu for window ID 71303388 with path /com/canonical/menu/44000DC from :1.72, unregistering that one
  version.compiz: compiz 1:0.9.12.2+16.04.20160331-0ubuntu1
  version.ia32-libs: ia32-libs N/A
  version.libdrm2: libdrm2 2.4.67-1
  version.libgl1-mesa-dri: libgl1-mesa-dri 11.1.2-1ubuntu2
  version.libgl1-mesa-dri-experimental: libgl1-mesa-dri-experimental N/A
  version.libgl1-mesa-glx: libgl1-mesa-glx 11.1.2-1ubuntu2
  version.xserver-xorg-core: xserver-xorg-core 2:1.18.1-1ubuntu4
  version.xserver-xorg-input-evdev: xserver-xorg-input-evdev 1:2.10.1-1ubuntu2
  version.xserver-xorg-video-ati: xserver-xorg-video-ati 1:7.6.1-1ubuntu2
  version.xserver-xorg-video-intel: xserver-xorg-video-intel 2:2.99.917+git20160218-1ubuntu3
  version.xserver-xorg-video-nouveau: xserver-xorg-video-nouveau 1:1.0.12-1build2
  xserver.bootTime: Tue Apr  5 18:03:49 2016
  xserver.configfile: default
  xserver.errors:
   
  xserver.logfile: /var/log/Xorg.0.log
  xserver.outputs:
   product id                                5194 
   vendor                                     SHP
  xserver.version: 2:1.18.1-1ubuntu4

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