Public bug reported:

Using 16.04 daily image: 20160919(downloading date)
With testing package for 4.8 kernel: ppa:canonical-kernel-team/unstable
Graphic chips:
00:02.0 VGA compatible controller [0300]: Intel Corporation HD Graphics 530 
[8086:191b] (rev 06)
01:00.0 3D controller [0302]: NVIDIA Corporation GM107M [GeForce GTX 960M] 
[10de:139b] (rev ff)

Desktop wallpaper on extended display shows black background only, and
the hdmi detection is very unstable.

ProblemType: Bug
DistroRelease: Ubuntu 16.10
Package: xorg 1:7.7+13ubuntu3
ProcVersionSignature: Ubuntu 4.8.0-14.15-generic 4.8.0-rc7
Uname: Linux 4.8.0-14-generic x86_64
.tmp.unity_support_test.0:
 
ApportVersion: 2.20.3-0ubuntu7
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 23 05:30:30 2016
DistUpgraded: Fresh install
DistroCodename: yakkety
DistroVariant: ubuntu
ExtraDebuggingInterest: Yes, including running git bisection searches
GraphicsCard:
 Intel Corporation HD Graphics 530 [8086:191b] (rev 06) (prog-if 00 [VGA 
controller])
   Subsystem: Dell HD Graphics 530 [1028:06e4]
InstallationDate: Installed on 2016-09-20 (3 days ago)
InstallationMedia: Ubuntu 16.10 "Yakkety Yak" - Alpha amd64 (20160919)
Lsusb:
 Bus 002 Device 001: ID 1d6b:0003 Linux Foundation 3.0 root hub
 Bus 001 Device 003: ID 04f3:21d5 Elan Microelectronics Corp. 
 Bus 001 Device 002: ID 0a5c:6410 Broadcom Corp. 
 Bus 001 Device 004: ID 0c45:6713 Microdia 
 Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
MachineType: Dell Inc. XPS 15 9550
ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-4.8.0-14-generic.efi.signed 
root=UUID=d16ac6eb-1b3e-4aa5-813b-57b5c7ef165a ro quiet splash vt.handoff=7
SourcePackage: xorg
UpgradeStatus: No upgrade log present (probably fresh install)
dmi.bios.date: 04/07/2016
dmi.bios.vendor: Dell Inc.
dmi.bios.version: 01.02.00
dmi.board.name: 0N7TVV
dmi.board.vendor: Dell Inc.
dmi.board.version: A01
dmi.chassis.type: 9
dmi.chassis.vendor: Dell Inc.
dmi.modalias: 
dmi:bvnDellInc.:bvr01.02.00:bd04/07/2016:svnDellInc.:pnXPS159550:pvr:rvnDellInc.:rn0N7TVV:rvrA01:cvnDellInc.:ct9:cvr:
dmi.product.name: XPS 15 9550
dmi.sys.vendor: Dell Inc.
version.compiz: compiz 1:0.9.13.0+16.10.20160818.2-0ubuntu2
version.ia32-libs: ia32-libs N/A
version.libdrm2: libdrm2 2.4.70-1
version.libgl1-mesa-dri: libgl1-mesa-dri 12.0.3-1ubuntu1
version.libgl1-mesa-dri-experimental: libgl1-mesa-dri-experimental N/A
version.libgl1-mesa-glx: libgl1-mesa-glx 12.0.3-1ubuntu1
version.xserver-xorg-core: xserver-xorg-core 2:1.18.4-1ubuntu6
version.xserver-xorg-input-evdev: xserver-xorg-input-evdev 1:2.10.2-1ubuntu1
version.xserver-xorg-video-ati: xserver-xorg-video-ati 1:7.7.1-1
version.xserver-xorg-video-intel: xserver-xorg-video-intel 
2:2.99.917+git20160706-1ubuntu1
version.xserver-xorg-video-nouveau: xserver-xorg-video-nouveau 1:1.0.12-2

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


** Tags: 201606-22346 amd64 apport-bug compiz-0.9 nplusone ubuntu yakkety

** Attachment added: "hdmi-plugged.syslog"
   
https://bugs.launchpad.net/bugs/1626935/+attachment/4746874/+files/hdmi-plugged.syslog

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https://bugs.launchpad.net/bugs/1626935

Title:
  [Yakkety] desktop in black background on extended HDMI display

Status in xorg package in Ubuntu:
  New

Bug description:
  Using 16.04 daily image: 20160919(downloading date)
  With testing package for 4.8 kernel: ppa:canonical-kernel-team/unstable
  Graphic chips:
  00:02.0 VGA compatible controller [0300]: Intel Corporation HD Graphics 530 
[8086:191b] (rev 06)
  01:00.0 3D controller [0302]: NVIDIA Corporation GM107M [GeForce GTX 960M] 
[10de:139b] (rev ff)

  Desktop wallpaper on extended display shows black background only, and
  the hdmi detection is very unstable.

  ProblemType: Bug
  DistroRelease: Ubuntu 16.10
  Package: xorg 1:7.7+13ubuntu3
  ProcVersionSignature: Ubuntu 4.8.0-14.15-generic 4.8.0-rc7
  Uname: Linux 4.8.0-14-generic x86_64
  .tmp.unity_support_test.0:
   
  ApportVersion: 2.20.3-0ubuntu7
  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 23 05:30:30 2016
  DistUpgraded: Fresh install
  DistroCodename: yakkety
  DistroVariant: ubuntu
  ExtraDebuggingInterest: Yes, including running git bisection searches
  GraphicsCard:
   Intel Corporation HD Graphics 530 [8086:191b] (rev 06) (prog-if 00 [VGA 
controller])
     Subsystem: Dell HD Graphics 530 [1028:06e4]
  InstallationDate: Installed on 2016-09-20 (3 days ago)
  InstallationMedia: Ubuntu 16.10 "Yakkety Yak" - Alpha amd64 (20160919)
  Lsusb:
   Bus 002 Device 001: ID 1d6b:0003 Linux Foundation 3.0 root hub
   Bus 001 Device 003: ID 04f3:21d5 Elan Microelectronics Corp. 
   Bus 001 Device 002: ID 0a5c:6410 Broadcom Corp. 
   Bus 001 Device 004: ID 0c45:6713 Microdia 
   Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
  MachineType: Dell Inc. XPS 15 9550
  ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-4.8.0-14-generic.efi.signed 
root=UUID=d16ac6eb-1b3e-4aa5-813b-57b5c7ef165a ro quiet splash vt.handoff=7
  SourcePackage: xorg
  UpgradeStatus: No upgrade log present (probably fresh install)
  dmi.bios.date: 04/07/2016
  dmi.bios.vendor: Dell Inc.
  dmi.bios.version: 01.02.00
  dmi.board.name: 0N7TVV
  dmi.board.vendor: Dell Inc.
  dmi.board.version: A01
  dmi.chassis.type: 9
  dmi.chassis.vendor: Dell Inc.
  dmi.modalias: 
dmi:bvnDellInc.:bvr01.02.00:bd04/07/2016:svnDellInc.:pnXPS159550:pvr:rvnDellInc.:rn0N7TVV:rvrA01:cvnDellInc.:ct9:cvr:
  dmi.product.name: XPS 15 9550
  dmi.sys.vendor: Dell Inc.
  version.compiz: compiz 1:0.9.13.0+16.10.20160818.2-0ubuntu2
  version.ia32-libs: ia32-libs N/A
  version.libdrm2: libdrm2 2.4.70-1
  version.libgl1-mesa-dri: libgl1-mesa-dri 12.0.3-1ubuntu1
  version.libgl1-mesa-dri-experimental: libgl1-mesa-dri-experimental N/A
  version.libgl1-mesa-glx: libgl1-mesa-glx 12.0.3-1ubuntu1
  version.xserver-xorg-core: xserver-xorg-core 2:1.18.4-1ubuntu6
  version.xserver-xorg-input-evdev: xserver-xorg-input-evdev 1:2.10.2-1ubuntu1
  version.xserver-xorg-video-ati: xserver-xorg-video-ati 1:7.7.1-1
  version.xserver-xorg-video-intel: xserver-xorg-video-intel 
2:2.99.917+git20160706-1ubuntu1
  version.xserver-xorg-video-nouveau: xserver-xorg-video-nouveau 1:1.0.12-2

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