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[groucho <1553503@xxxxxxxxxxxxxxxxxx>]

Thank you for your guidance.
Here is the result of the reverse bisect :

e2e407dc093f530b771ee8bf8fe1be41e3cea8b3 is the first bad commit
commit e2e407dc093f530b771ee8bf8fe1be41e3cea8b3
Author: Matt Roper <matthew.d.roper@xxxxxxxxx>
Date:   Mon Feb 8 11:05:28 2016 -0800

    drm/i915: Pretend cursor is always on for ILK-style WM calculations (v2)
    
    Due to our lack of two-step watermark programming, our driver has
    historically pretended that the cursor plane is always on for the
    purpose of watermark calculations; this helps avoid serious flickering
    when the cursor turns off/on (e.g., when the user moves the mouse
    pointer to a different screen).  That workaround was accidentally
    dropped as we started working toward atomic watermark updates.  Since we
    still aren't quite there yet with two-stage updates, we need to
    resurrect the workaround and treat the cursor as always active.
    
    v2: Tweak cursor width calculations slightly to more closely match the
        logic we used before the atomic overhaul began.  (Ville)
    
    Cc: simdev11@xxxxxxxxxxx
    Cc: manfred.kitzbichler@xxxxxxxxx
    Cc: drm-intel-fixes@xxxxxxxxxxxxxxxxxxxxx
    Reported-by: simdev11@xxxxxxxxxxx
    Reported-by: manfred.kitzbichler@xxxxxxxxx
    Bugzilla: https://bugs.freedesktop.org/show_bug.cgi?id=93892
    Fixes: 43d59eda1 ("drm/i915: Eliminate usage of plane_wm_parameters from ILK-style WM code (v2)")
    Signed-off-by: Matt Roper <matthew.d.roper@xxxxxxxxx>
    Link: http://patchwork.freedesktop.org/patch/msgid/1454479611-6804-1-git-send-email-matthew.d.roper@xxxxxxxxx
    (cherry picked from commit b2435692dbb709d4c8ff3b2f2815c9b8423b72bb)
    Signed-off-by: Jani Nikula <jani.nikula@xxxxxxxxx>
    Link: http://patchwork.freedesktop.org/patch/msgid/1454958328-30129-1-git-send-email-matthew.d.roper@xxxxxxxxx

:040000 040000 545634aa608f59cd8959a6196761450afa57ee5b
7b3259c003cbd1e27e02c976d73af848f69d248c M      drivers


** Bug watch added: freedesktop.org Bugzilla #93892
   https://bugs.freedesktop.org/show_bug.cgi?id=93892

** Attachment added: "bisect log"
   https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1553503/+attachment/4595339/+files/log.txt

** Changed in: linux (Ubuntu)
       Status: Incomplete => Confirmed

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https://bugs.launchpad.net/bugs/1553503

Title:
  multi monitors - black flashes or black screen when the mouse cursor
  leaves a monitor

Status in linux package in Ubuntu:
  Confirmed

Bug description:
  When the mouse cursor leaves one of the screens, there is either :
  - no problem
  - the screen becomes black just below the position of the cursor and instantly comes back to normal.
  - the screen becomes entirely black with some random colored pixels flickering on the far left of the screen. I have to move the cursor to the black screen, otherwise it stays black.

  It happens on Ubuntu Gnome 16.04 Beta and Ubuntu Mate 16.04 Beta.
  I have tested with other distributions (Debian Jessie and Fedora) and everything is fine.

  Hardware : Intel Ironlake (Thinkpad X201) with an external monitor
  plugged in.

  ProblemType: Bug
  DistroRelease: Ubuntu 16.04
  Package: xorg 1:7.7+13ubuntu1
  ProcVersionSignature: Ubuntu 4.4.0-7.22-generic 4.4.2
  Uname: Linux 4.4.0-7-generic x86_64
  ApportVersion: 2.20-0ubuntu3
  Architecture: amd64
  CasperVersion: 1.367
  CompizPlugins: No value set for `/apps/compiz-1/general/screen0/options/active_plugins'
  CompositorRunning: None
  CurrentDesktop: GNOME
  Date: Sat Mar  5 13:17:15 2016
  DistUpgraded: Fresh install
  DistroCodename: xenial
  DistroVariant: ubuntu
  ExtraDebuggingInterest: Yes
  GraphicsCard:
   Intel Corporation Core Processor Integrated Graphics Controller [8086:0046] (rev 02) (prog-if 00 [VGA controller])
     Subsystem: Lenovo Core Processor Integrated Graphics Controller [17aa:215a]
  LiveMediaBuild: Ubuntu-GNOME 16.04 LTS "Xenial Xerus" - Alpha amd64 (20160225.1)
  MachineType: LENOVO 3680KD3
  ProcEnviron:
   TERM=xterm-256color
   PATH=(custom, no user)
   XDG_RUNTIME_DIR=<set>
   LANG=en_US.UTF-8
   SHELL=/bin/bash
  ProcKernelCmdLine: file=/cdrom/preseed/username.seed boot=casper initrd=/casper/initrd.lz quiet splash --- maybe-ubiquity
  SourcePackage: xorg
  Symptom: display
  UpgradeStatus: No upgrade log present (probably fresh install)
  dmi.bios.date: 10/11/2012
  dmi.bios.vendor: LENOVO
  dmi.bios.version: 6QET70WW (1.40 )
  dmi.board.name: 3680KD3
  dmi.board.vendor: LENOVO
  dmi.board.version: Not Available
  dmi.chassis.asset.tag: No Asset Information
  dmi.chassis.type: 10
  dmi.chassis.vendor: LENOVO
  dmi.chassis.version: Not Available
  dmi.modalias: dmi:bvnLENOVO:bvr6QET70WW(1.40):bd10/11/2012:svnLENOVO:pn3680KD3:pvrThinkPadX201:rvnLENOVO:rn3680KD3:rvrNotAvailable:cvnLENOVO:ct10:cvrNotAvailable:
  dmi.product.name: 3680KD3
  dmi.product.version: ThinkPad X201
  dmi.sys.vendor: LENOVO
  version.compiz: compiz N/A
  version.ia32-libs: ia32-libs N/A
  version.libdrm2: libdrm2 2.4.67-1
  version.libgl1-mesa-dri: libgl1-mesa-dri 11.1.2-1ubuntu1
  version.libgl1-mesa-dri-experimental: libgl1-mesa-dri-experimental N/A
  version.libgl1-mesa-glx: libgl1-mesa-glx 11.1.2-1ubuntu1
  version.xserver-xorg-core: xserver-xorg-core 2:1.17.3-2ubuntu4
  version.xserver-xorg-input-evdev: xserver-xorg-input-evdev 1:2.9.2-1ubuntu1
  version.xserver-xorg-video-ati: xserver-xorg-video-ati 1:7.6.1-1
  version.xserver-xorg-video-intel: xserver-xorg-video-intel 2:2.99.917+git20160218-1ubuntu1
  version.xserver-xorg-video-nouveau: xserver-xorg-video-nouveau 1:1.0.12-1
  xserver.bootTime: Sat Mar  5 13:03:55 2016
  xserver.configfile: default
  xserver.errors:
   
  xserver.logfile: /var/log/Xorg.0.log
  xserver.outputs:
   product id                                2202 
   vendor                                     BOE
  xserver.version: 2:1.17.3-2ubuntu4

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