Public bug reported:

I am running Ubuntu 16.04.3 on a Macbook Pro using a dock with two
monitors. While docked, the internal display is not operational, instead
using only the two monitors. I have repeatedly encountered issues where
application windows that are active on the left display are not
selectable with the mouse. I can still use the Unity launcher bar and
the top menu bar but not any open windows. The windows on the right
monitor still work properly. If I drag applications from the right
display to the left display, that application also becomes unclickable
with the mouse. Windows that span across both display and clickable on
the right display, but not the left display. This behavior happens
occasionally (about once a week) with any running applications, and I
have not been able to cause the behavior repeatably. I can still use the
applications by using the Unity launcher to switch to the application,
then using keyboard commands. I would note that usually when this
happens, I have a Windows virtual machine running in Virtualbox. I'm not
sure if that is related or just a coincidence. At times, I can get the
OS operating correctly again by closing all open application windows.
Other times, it requires a complete reboot to restore operation to the
left side monitor.

ProblemType: Bug
DistroRelease: Ubuntu 16.04
Package: xorg 1:7.7+13ubuntu3
ProcVersionSignature: Ubuntu 4.10.0-38.42~16.04.1-generic 4.10.17
Uname: Linux 4.10.0-38-generic x86_64
NonfreeKernelModules: nvidia_modeset nvidia wl
.proc.driver.nvidia.gpus.0000.01.00.0: Error: [Errno 21] Is a directory: 
'/proc/driver/nvidia/gpus/0000:01:00.0'
.proc.driver.nvidia.registry: Binary: ""
.proc.driver.nvidia.version:
 NVRM version: NVIDIA UNIX x86_64 Kernel Module  375.66  Mon May  1 15:29:16 
PDT 2017
 GCC version:  gcc version 5.4.0 20160609 (Ubuntu 5.4.0-6ubuntu1~16.04.5)
.tmp.unity_support_test.0:
 
ApportVersion: 2.20.1-0ubuntu2.10
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 Nov 15 11:39:50 2017
DistUpgraded: Fresh install
DistroCodename: xenial
DistroVariant: ubuntu
ExtraDebuggingInterest: Yes
GraphicsCard:
 Intel Corporation 3rd Gen Core processor Graphics Controller [8086:0166] (rev 
09) (prog-if 00 [VGA controller])
   Subsystem: Apple Inc. 3rd Gen Core processor Graphics Controller [106b:00f7]
 NVIDIA Corporation GK107M [GeForce GT 650M Mac Edition] [10de:0fd5] (rev a1) 
(prog-if 00 [VGA controller])
   Subsystem: Apple Inc. GK107M [GeForce GT 650M Mac Edition] [106b:00f2]
InstallationDate: Installed on 2016-05-04 (559 days ago)
InstallationMedia: Ubuntu 16.04 LTS "Xenial Xerus" - Release amd64 (20160420.1)
MachineType: Apple Inc. MacBookPro10,1
ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-4.10.0-38-generic 
root=UUID=398390d3-f6be-4e80-8a20-f036f9ec4d26 ro net.ifnames=0 biosdevname=0 
quiet splash vt.handoff=7
SourcePackage: xorg
Symptom: display
UpgradeStatus: No upgrade log present (probably fresh install)
dmi.bios.date: 06/08/2015
dmi.bios.vendor: Apple Inc.
dmi.bios.version: MBP101.88Z.00EE.B09.1506081405
dmi.board.asset.tag: Base Board Asset Tag#
dmi.board.name: Mac-C3EC7CD22292981F
dmi.board.vendor: Apple Inc.
dmi.board.version: MacBookPro10,1
dmi.chassis.type: 10
dmi.chassis.vendor: Apple Inc.
dmi.chassis.version: Mac-C3EC7CD22292981F
dmi.modalias: 
dmi:bvnAppleInc.:bvrMBP101.88Z.00EE.B09.1506081405:bd06/08/2015:svnAppleInc.:pnMacBookPro10,1:pvr1.0:rvnAppleInc.:rnMac-C3EC7CD22292981F:rvrMacBookPro10,1:cvnAppleInc.:ct10:cvrMac-C3EC7CD22292981F:
dmi.product.name: MacBookPro10,1
dmi.product.version: 1.0
dmi.sys.vendor: Apple Inc.
version.compiz: compiz 1:0.9.12.2+16.04.20160823-0ubuntu1
version.ia32-libs: ia32-libs N/A
version.libdrm2: libdrm2 2.4.76-1~ubuntu16.04.1
version.libgl1-mesa-dri: libgl1-mesa-dri 17.0.7-0ubuntu0.16.04.2
version.libgl1-mesa-dri-experimental: libgl1-mesa-dri-experimental N/A
version.libgl1-mesa-glx: libgl1-mesa-glx 17.0.7-0ubuntu0.16.04.2
version.nvidia-graphics-drivers: nvidia-graphics-drivers-* N/A
version.xserver-xorg-core: xserver-xorg-core N/A
version.xserver-xorg-input-evdev: xserver-xorg-input-evdev N/A
version.xserver-xorg-video-ati: xserver-xorg-video-ati N/A
version.xserver-xorg-video-intel: xserver-xorg-video-intel N/A
version.xserver-xorg-video-nouveau: xserver-xorg-video-nouveau N/A
xserver.bootTime: Wed Nov 15 11:32:04 2017
xserver.configfile: /etc/X11/xorg.conf
xserver.errors:
 
xserver.logfile: /var/log/Xorg.0.log
xserver.outputs:
 
xserver.version: 2:1.19.3-1ubuntu1~16.04.4

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


** Tags: amd64 apport-bug compiz-0.9 possible-manual-nvidia-install ubuntu 
xenial

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https://bugs.launchpad.net/bugs/1732513

Title:
  Unable to access windows on second display

Status in xorg package in Ubuntu:
  New

Bug description:
  I am running Ubuntu 16.04.3 on a Macbook Pro using a dock with two
  monitors. While docked, the internal display is not operational,
  instead using only the two monitors. I have repeatedly encountered
  issues where application windows that are active on the left display
  are not selectable with the mouse. I can still use the Unity launcher
  bar and the top menu bar but not any open windows. The windows on the
  right monitor still work properly. If I drag applications from the
  right display to the left display, that application also becomes
  unclickable with the mouse. Windows that span across both display and
  clickable on the right display, but not the left display. This
  behavior happens occasionally (about once a week) with any running
  applications, and I have not been able to cause the behavior
  repeatably. I can still use the applications by using the Unity
  launcher to switch to the application, then using keyboard commands. I
  would note that usually when this happens, I have a Windows virtual
  machine running in Virtualbox. I'm not sure if that is related or just
  a coincidence. At times, I can get the OS operating correctly again by
  closing all open application windows. Other times, it requires a
  complete reboot to restore operation to the left side monitor.

  ProblemType: Bug
  DistroRelease: Ubuntu 16.04
  Package: xorg 1:7.7+13ubuntu3
  ProcVersionSignature: Ubuntu 4.10.0-38.42~16.04.1-generic 4.10.17
  Uname: Linux 4.10.0-38-generic x86_64
  NonfreeKernelModules: nvidia_modeset nvidia wl
  .proc.driver.nvidia.gpus.0000.01.00.0: Error: [Errno 21] Is a directory: 
'/proc/driver/nvidia/gpus/0000:01:00.0'
  .proc.driver.nvidia.registry: Binary: ""
  .proc.driver.nvidia.version:
   NVRM version: NVIDIA UNIX x86_64 Kernel Module  375.66  Mon May  1 15:29:16 
PDT 2017
   GCC version:  gcc version 5.4.0 20160609 (Ubuntu 5.4.0-6ubuntu1~16.04.5)
  .tmp.unity_support_test.0:
   
  ApportVersion: 2.20.1-0ubuntu2.10
  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 Nov 15 11:39:50 2017
  DistUpgraded: Fresh install
  DistroCodename: xenial
  DistroVariant: ubuntu
  ExtraDebuggingInterest: Yes
  GraphicsCard:
   Intel Corporation 3rd Gen Core processor Graphics Controller [8086:0166] 
(rev 09) (prog-if 00 [VGA controller])
     Subsystem: Apple Inc. 3rd Gen Core processor Graphics Controller 
[106b:00f7]
   NVIDIA Corporation GK107M [GeForce GT 650M Mac Edition] [10de:0fd5] (rev a1) 
(prog-if 00 [VGA controller])
     Subsystem: Apple Inc. GK107M [GeForce GT 650M Mac Edition] [106b:00f2]
  InstallationDate: Installed on 2016-05-04 (559 days ago)
  InstallationMedia: Ubuntu 16.04 LTS "Xenial Xerus" - Release amd64 
(20160420.1)
  MachineType: Apple Inc. MacBookPro10,1
  ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-4.10.0-38-generic 
root=UUID=398390d3-f6be-4e80-8a20-f036f9ec4d26 ro net.ifnames=0 biosdevname=0 
quiet splash vt.handoff=7
  SourcePackage: xorg
  Symptom: display
  UpgradeStatus: No upgrade log present (probably fresh install)
  dmi.bios.date: 06/08/2015
  dmi.bios.vendor: Apple Inc.
  dmi.bios.version: MBP101.88Z.00EE.B09.1506081405
  dmi.board.asset.tag: Base Board Asset Tag#
  dmi.board.name: Mac-C3EC7CD22292981F
  dmi.board.vendor: Apple Inc.
  dmi.board.version: MacBookPro10,1
  dmi.chassis.type: 10
  dmi.chassis.vendor: Apple Inc.
  dmi.chassis.version: Mac-C3EC7CD22292981F
  dmi.modalias: 
dmi:bvnAppleInc.:bvrMBP101.88Z.00EE.B09.1506081405:bd06/08/2015:svnAppleInc.:pnMacBookPro10,1:pvr1.0:rvnAppleInc.:rnMac-C3EC7CD22292981F:rvrMacBookPro10,1:cvnAppleInc.:ct10:cvrMac-C3EC7CD22292981F:
  dmi.product.name: MacBookPro10,1
  dmi.product.version: 1.0
  dmi.sys.vendor: Apple Inc.
  version.compiz: compiz 1:0.9.12.2+16.04.20160823-0ubuntu1
  version.ia32-libs: ia32-libs N/A
  version.libdrm2: libdrm2 2.4.76-1~ubuntu16.04.1
  version.libgl1-mesa-dri: libgl1-mesa-dri 17.0.7-0ubuntu0.16.04.2
  version.libgl1-mesa-dri-experimental: libgl1-mesa-dri-experimental N/A
  version.libgl1-mesa-glx: libgl1-mesa-glx 17.0.7-0ubuntu0.16.04.2
  version.nvidia-graphics-drivers: nvidia-graphics-drivers-* N/A
  version.xserver-xorg-core: xserver-xorg-core N/A
  version.xserver-xorg-input-evdev: xserver-xorg-input-evdev N/A
  version.xserver-xorg-video-ati: xserver-xorg-video-ati N/A
  version.xserver-xorg-video-intel: xserver-xorg-video-intel N/A
  version.xserver-xorg-video-nouveau: xserver-xorg-video-nouveau N/A
  xserver.bootTime: Wed Nov 15 11:32:04 2017
  xserver.configfile: /etc/X11/xorg.conf
  xserver.errors:
   
  xserver.logfile: /var/log/Xorg.0.log
  xserver.outputs:
   
  xserver.version: 2:1.19.3-1ubuntu1~16.04.4

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