Public bug reported:

I'm not sure where to look for more information, but happy to debug
further.  I find that when both 4k displays are active, when the mouse
cursor is within the external monitor area, both displays are on.  When
the mouse cursor enters the laptop's display screen area, the laptop
screen either blanks or turns off (not sure which).

ProblemType: Bug
DistroRelease: Ubuntu 16.04
Package: xorg 1:7.7+13ubuntu3
ProcVersionSignature: Ubuntu 4.4.0-22.40-generic 4.4.8
Uname: Linux 4.4.0-22-generic x86_64
.tmp.unity_support_test.0:
 
ApportVersion: 2.20.1-0ubuntu2
Architecture: amd64
BootLog:
 
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: Wed May 25 10:37:41 2016
DistUpgraded: Fresh install
DistroCodename: xenial
DistroVariant: ubuntu
ExtraDebuggingInterest: Yes
GraphicsCard:
 Intel Corporation Skylake Integrated Graphics [8086:191b] (rev 06) (prog-if 00 
[VGA controller])
   Subsystem: Samsung Electronics Co Ltd Skylake Integrated Graphics [144d:c12b]
   Subsystem: Samsung Electronics Co Ltd GM107M [GeForce GTX 950M] [144d:c12b]
InstallationDate: Installed on 2015-12-22 (154 days ago)
InstallationMedia: Ubuntu 15.10 "Wily Werewolf" - Release amd64 (20151021)
MachineType: SAMSUNG ELECTRONICS CO., LTD. 940Z5L
ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-4.4.0-22-generic.efi.signed 
root=UUID=24c27814-5135-4a80-9ce1-b932e2513949 ro quiet splash vt.handoff=7
SourcePackage: xorg
Symptom: display
UpgradeStatus: No upgrade log present (probably fresh install)
dmi.bios.date: 03/11/2016
dmi.bios.vendor: American Megatrends Inc.
dmi.bios.version: P06AFC.091.160311.SH
dmi.board.asset.tag: No Asset Tag
dmi.board.name: NP940Z5L-X01US
dmi.board.vendor: SAMSUNG ELECTRONICS CO., LTD.
dmi.board.version: SGL8554A1H-C01-G001-S0001+10.0.10240
dmi.chassis.asset.tag: No Asset Tag
dmi.chassis.type: 9
dmi.chassis.vendor: SAMSUNG ELECTRONICS CO., LTD.
dmi.chassis.version: N/A
dmi.modalias: 
dmi:bvnAmericanMegatrendsInc.:bvrP06AFC.091.160311.SH:bd03/11/2016:svnSAMSUNGELECTRONICSCO.,LTD.:pn940Z5L:pvrP06AFC:rvnSAMSUNGELECTRONICSCO.,LTD.:rnNP940Z5L-X01US:rvrSGL8554A1H-C01-G001-S0001+10.0.10240:cvnSAMSUNGELECTRONICSCO.,LTD.:ct9:cvrN/A:
dmi.product.name: 940Z5L
dmi.product.version: P06AFC
dmi.sys.vendor: SAMSUNG ELECTRONICS CO., LTD.
version.compiz: compiz 1:0.9.12.2+16.04.20160415-0ubuntu1
version.ia32-libs: ia32-libs N/A
version.libdrm2: libdrm2 2.4.67-1
version.libgl1-mesa-dri: libgl1-mesa-dri 11.2.0-1ubuntu2
version.libgl1-mesa-dri-experimental: libgl1-mesa-dri-experimental N/A
version.libgl1-mesa-glx: libgl1-mesa-glx 11.2.0-1ubuntu2
version.xserver-xorg-core: xserver-xorg-core 2:1.18.3-1ubuntu2
version.xserver-xorg-input-evdev: xserver-xorg-input-evdev 1:2.10.1-1ubuntu2
version.xserver-xorg-video-ati: xserver-xorg-video-ati 1:7.7.0-1
version.xserver-xorg-video-intel: xserver-xorg-video-intel 
2:2.99.917+git20160325-1ubuntu1
version.xserver-xorg-video-nouveau: xserver-xorg-video-nouveau 1:1.0.12-1build2
xserver.bootTime: Wed May 25 09:50:07 2016
xserver.configfile: default
xserver.errors:
 Failed to load module "nvidia" (module does not exist, 0)
 Failed to load module "nvidia" (module does not exist, 0)
 Unknown chipset: NV117
xserver.logfile: /var/log/Xorg.0.log
xserver.outputs:
 product id                               16714 
 vendor                                     SDC
xserver.version: 2:1.18.3-1ubuntu2

** Affects: xorg (Ubuntu)
     Importance: Undecided
         Status: New


** Tags: amd64 apport-bug compiz-0.9 ubuntu xenial

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You received this bug notification because you are a member of Desktop
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https://bugs.launchpad.net/bugs/1585687

Title:
  Screen blanks with dual 4k displays when cursor enters built-in
  display

Status in xorg package in Ubuntu:
  New

Bug description:
  I'm not sure where to look for more information, but happy to debug
  further.  I find that when both 4k displays are active, when the mouse
  cursor is within the external monitor area, both displays are on.
  When the mouse cursor enters the laptop's display screen area, the
  laptop screen either blanks or turns off (not sure which).

  ProblemType: Bug
  DistroRelease: Ubuntu 16.04
  Package: xorg 1:7.7+13ubuntu3
  ProcVersionSignature: Ubuntu 4.4.0-22.40-generic 4.4.8
  Uname: Linux 4.4.0-22-generic x86_64
  .tmp.unity_support_test.0:
   
  ApportVersion: 2.20.1-0ubuntu2
  Architecture: amd64
  BootLog:
   
  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: Wed May 25 10:37:41 2016
  DistUpgraded: Fresh install
  DistroCodename: xenial
  DistroVariant: ubuntu
  ExtraDebuggingInterest: Yes
  GraphicsCard:
   Intel Corporation Skylake Integrated Graphics [8086:191b] (rev 06) (prog-if 
00 [VGA controller])
     Subsystem: Samsung Electronics Co Ltd Skylake Integrated Graphics 
[144d:c12b]
     Subsystem: Samsung Electronics Co Ltd GM107M [GeForce GTX 950M] [144d:c12b]
  InstallationDate: Installed on 2015-12-22 (154 days ago)
  InstallationMedia: Ubuntu 15.10 "Wily Werewolf" - Release amd64 (20151021)
  MachineType: SAMSUNG ELECTRONICS CO., LTD. 940Z5L
  ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-4.4.0-22-generic.efi.signed 
root=UUID=24c27814-5135-4a80-9ce1-b932e2513949 ro quiet splash vt.handoff=7
  SourcePackage: xorg
  Symptom: display
  UpgradeStatus: No upgrade log present (probably fresh install)
  dmi.bios.date: 03/11/2016
  dmi.bios.vendor: American Megatrends Inc.
  dmi.bios.version: P06AFC.091.160311.SH
  dmi.board.asset.tag: No Asset Tag
  dmi.board.name: NP940Z5L-X01US
  dmi.board.vendor: SAMSUNG ELECTRONICS CO., LTD.
  dmi.board.version: SGL8554A1H-C01-G001-S0001+10.0.10240
  dmi.chassis.asset.tag: No Asset Tag
  dmi.chassis.type: 9
  dmi.chassis.vendor: SAMSUNG ELECTRONICS CO., LTD.
  dmi.chassis.version: N/A
  dmi.modalias: 
dmi:bvnAmericanMegatrendsInc.:bvrP06AFC.091.160311.SH:bd03/11/2016:svnSAMSUNGELECTRONICSCO.,LTD.:pn940Z5L:pvrP06AFC:rvnSAMSUNGELECTRONICSCO.,LTD.:rnNP940Z5L-X01US:rvrSGL8554A1H-C01-G001-S0001+10.0.10240:cvnSAMSUNGELECTRONICSCO.,LTD.:ct9:cvrN/A:
  dmi.product.name: 940Z5L
  dmi.product.version: P06AFC
  dmi.sys.vendor: SAMSUNG ELECTRONICS CO., LTD.
  version.compiz: compiz 1:0.9.12.2+16.04.20160415-0ubuntu1
  version.ia32-libs: ia32-libs N/A
  version.libdrm2: libdrm2 2.4.67-1
  version.libgl1-mesa-dri: libgl1-mesa-dri 11.2.0-1ubuntu2
  version.libgl1-mesa-dri-experimental: libgl1-mesa-dri-experimental N/A
  version.libgl1-mesa-glx: libgl1-mesa-glx 11.2.0-1ubuntu2
  version.xserver-xorg-core: xserver-xorg-core 2:1.18.3-1ubuntu2
  version.xserver-xorg-input-evdev: xserver-xorg-input-evdev 1:2.10.1-1ubuntu2
  version.xserver-xorg-video-ati: xserver-xorg-video-ati 1:7.7.0-1
  version.xserver-xorg-video-intel: xserver-xorg-video-intel 
2:2.99.917+git20160325-1ubuntu1
  version.xserver-xorg-video-nouveau: xserver-xorg-video-nouveau 
1:1.0.12-1build2
  xserver.bootTime: Wed May 25 09:50:07 2016
  xserver.configfile: default
  xserver.errors:
   Failed to load module "nvidia" (module does not exist, 0)
   Failed to load module "nvidia" (module does not exist, 0)
   Unknown chipset: NV117
  xserver.logfile: /var/log/Xorg.0.log
  xserver.outputs:
   product id                               16714 
   vendor                                     SDC
  xserver.version: 2:1.18.3-1ubuntu2

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