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[Michael Thayer <1492170@xxxxxxxxxxxxxxxxxx>]

I can't test immediately in any case, as I am travelling and do not have
access to an external monitor.

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https://bugs.launchpad.net/bugs/1492170

Title:
  Screen flicker and resolution problems after hot-plug

Status in linux package in Ubuntu:
  Incomplete

Bug description:
  After upgrading to Wily, when I change the configuration of screens
  attached (specifically: dock the laptop to a docking station with a
  vertically larger external screen or open the laptop to activate the
  internal screen while correctly running with said external screen)
  this causes various display issues, including flickering while the
  mouse cursor is moved and or one screen flickering the contents of the
  other; incorrect resolution; incorrect offset of displayed screen
  contents on screen.  I saw similar (can't say whether or not
  identical) effects using the stock 4.1.0-3.3 generic kernel, and
  mainline generic kernels 4.0.0-040000rc2.201503031836 (working before
  the first reboot after upgrading to Wily), 4.1.3-040103.201507220129
  and 4.1.6-040106.201508170230.  In addition (probably a separate
  issue), when booting 4.1.0-3.3 to external monitor only, the mouse
  cursor was not shown.

  After my last test I was able to bring things back to "normal" by
  killing the X server and logging in again.

  $ lsb_release -rd
  Description:	Ubuntu Wily Werewolf (development branch)
  Release:	15.10

  $ apt-cache policy xserver-xorg-video-intel
  xserver-xorg-video-intel:
    Installed: 2:2.99.917+git20150808-0ubuntu2
    Candidate: 2:2.99.917+git20150808-0ubuntu2
    Version table:
   *** 2:2.99.917+git20150808-0ubuntu2 0
          500 http://de.archive.ubuntu.com/ubuntu/ wily/main amd64 Packages
          100 /var/lib/dpkg/status

  ProblemType: Bug
  DistroRelease: Ubuntu 15.10
  Package: xserver-xorg-video-intel 2:2.99.917+git20150808-0ubuntu2
  Uname: Linux 4.1.6-040106-generic x86_64
  .tmp.unity.support.test.0:
   
  ApportVersion: 2.18-0ubuntu9
  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: Fri Sep  4 11:11:59 2015
  DistUpgraded: 2015-09-03 15:02:03,761 DEBUG enabling apt cron job
  DistroCodename: wily
  DistroVariant: ubuntu
  ExtraDebuggingInterest: Yes
  GraphicsCard:
   Intel Corporation Haswell-ULT Integrated Graphics Controller [8086:0a16] (rev 0b) (prog-if 00 [VGA controller])
     Subsystem: Dell Device [1028:05cb]
  InstallationDate: Installed on 2014-08-01 (399 days ago)
  InstallationMedia: Ubuntu 14.04 LTS "Trusty Tahr" - Release amd64 (20140417)
  MachineType: Dell Inc. Latitude E7440
  ProcKernelCmdLine: BOOT_IMAGE=/vmlinuz-4.1.6-040106-generic root=/dev/mapper/ubuntu--vg-root ro quiet splash vt.handoff=7
  SourcePackage: xserver-xorg-video-intel
  UpgradeStatus: Upgraded to wily on 2015-09-03 (0 days ago)
  dmi.bios.date: 06/26/2014
  dmi.bios.vendor: Dell Inc.
  dmi.bios.version: A10
  dmi.board.name: 0RYCC9
  dmi.board.vendor: Dell Inc.
  dmi.board.version: A00
  dmi.chassis.type: 9
  dmi.chassis.vendor: Dell Inc.
  dmi.modalias: dmi:bvnDellInc.:bvrA10:bd06/26/2014:svnDellInc.:pnLatitudeE7440:pvr01:rvnDellInc.:rn0RYCC9:rvrA00:cvnDellInc.:ct9:cvr:
  dmi.product.name: Latitude E7440
  dmi.product.version: 01
  dmi.sys.vendor: Dell Inc.
  version.compiz: compiz 1:0.9.12.1+15.10.20150805-0ubuntu1
  version.ia32-libs: ia32-libs N/A
  version.libdrm2: libdrm2 2.4.64-1
  version.libgl1-mesa-dri: libgl1-mesa-dri 10.6.3-1ubuntu1
  version.libgl1-mesa-dri-experimental: libgl1-mesa-dri-experimental N/A
  version.libgl1-mesa-glx: libgl1-mesa-glx 10.6.3-1ubuntu1
  version.xserver-xorg-core: xserver-xorg-core 2:1.17.2-1ubuntu5
  version.xserver-xorg-input-evdev: xserver-xorg-input-evdev 1:2.9.2-1ubuntu1
  version.xserver-xorg-video-ati: xserver-xorg-video-ati 1:7.5.0+git20150819-0ubuntu1
  version.xserver-xorg-video-intel: xserver-xorg-video-intel 2:2.99.917+git20150808-0ubuntu2
  version.xserver-xorg-video-nouveau: xserver-xorg-video-nouveau 1:1.0.11-1ubuntu3
  xserver.bootTime: Fri Sep  4 11:10:45 2015
  xserver.configfile: default
  xserver.errors:
   
  xserver.logfile: /var/log/Xorg.0.log
  xserver.outputs:
   product id                                4413 
   vendor                                     AUO
  xserver.version: 2:1.17.2-1ubuntu5

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