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[Bug 1585329] [NEW] Sometimes a black rectangle appears briefly under the mouse cursor


Public bug reported:

I'm on 16.04, using a laptop with Nvidia Optimus (Nvidia driver installed, Intel card selected).
The problem also occurs in a guest session.
It didn't occur in 14.04.

Sometimes I see a black rectangle appear for a very brief moment (a flash).
Horizontally, the rectangle occupies the whole screen.
Vertically, the rectangle seems to start in the mouse cursor and ends in the bottom of the screen.

The easiest way to reproduce the bug is to open a Gnome terminal, move
the mouse cursor inside the window and press Alt+Backspace repeatedly.

ProblemType: Bug
DistroRelease: Ubuntu 16.04
Package: compiz 1:
ProcVersionSignature: Ubuntu 4.4.0-22.40-generic 4.4.8
Uname: Linux 4.4.0-22-generic x86_64
ApportVersion: 2.20.1-0ubuntu2
Architecture: amd64
CompizPlugins: [core,composite,opengl,compiztoolbox,decor,vpswitch,snap,mousepoll,resize,place,move,wall,grid,regex,imgpng,session,gnomecompat,animation,fade,staticswitcher,workarounds,scale,expo,ezoom,dbus]
CompositorRunning: compiz
CompositorUnredirectDriverBlacklist: '(nouveau|Intel).*Mesa 8.0'
CompositorUnredirectFSW: true
CurrentDesktop: Unity
Date: Tue May 24 19:44:19 2016
DistUpgraded: Fresh install
DistroCodename: xenial
DistroVariant: ubuntu
EcryptfsInUse: Yes
 Intel Corporation Core Processor Integrated Graphics Controller [8086:0046] (rev 02) (prog-if 00 [VGA controller])
   Subsystem: Acer Incorporated [ALI] Core Processor Integrated Graphics Controller [1025:0488]
 NVIDIA Corporation GF108M [GeForce GT 420M] [10de:0df1] (rev ff) (prog-if ff)
 b'org.compiz.core' b'outputs' b"['1366x768+0+0']"
 b'org.compiz.core' b'hsize' b'2'
 b'org.compiz.core' b'active-plugins' b"['core', 'composite', 'opengl', 'compiztoolbox', 'imgpng', 'snap', 'titleinfo', 'grid', 'vpswitch', 'move', 'regex', 'copytex', 'place', 'mousepoll', 'session', 'commands', 'wall', 'resize', 'winrules', 'dbus', 'unitymtgrabhandles', 'animation', 'expo', 'ezoom', 'fade', 'workarounds', 'scale', 'unityshell']"
 b'org.compiz.core' b'vsize' b'2'
 b'org.compiz.core' b'focus-prevention-level' b'0'
InstallationDate: Installed on 2016-04-25 (28 days ago)
InstallationMedia: Ubuntu 16.04 LTS "Xenial Xerus" - Release amd64 (20160420.1)
 Bus 002 Device 002: ID 8087:0020 Intel Corp. Integrated Rate Matching Hub
 Bus 002 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
 Bus 001 Device 003: ID 064e:a219 Suyin Corp. 1.3M WebCam (notebook emachines E730, Acer sub-brand)
 Bus 001 Device 002: ID 8087:0020 Intel Corp. Integrated Rate Matching Hub
 Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
MachineType: Acer Aspire 5742G
PackageArchitecture: all
ProcKernelCmdLine: BOOT_IMAGE=/vmlinuz-4.4.0-22-generic root=UUID=68a53fa4-4cfc-45bc-84de-762947ea37e1 ro locale=pt_PT quiet splash
SourcePackage: compiz
UpgradeStatus: No upgrade log present (probably fresh install)
dmi.bios.date: 08/13/2012
dmi.bios.vendor: Acer
dmi.bios.version: V1.30
dmi.board.asset.tag: Base Board Asset Tag
dmi.board.name: Aspire 5742G
dmi.board.vendor: Acer
dmi.board.version: V1.30
dmi.chassis.type: 10
dmi.chassis.vendor: Acer
dmi.chassis.version: V1.30
dmi.modalias: dmi:bvnAcer:bvrV1.30:bd08/13/2012:svnAcer:pnAspire5742G:pvrV1.30:rvnAcer:rnAspire5742G:rvrV1.30:cvnAcer:ct10:cvrV1.30:
dmi.product.name: Aspire 5742G
dmi.product.version: V1.30
dmi.sys.vendor: Acer
version.compiz: compiz 1:
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: Tue May 24 19:18:29 2016
xserver.configfile: default
xserver.logfile: /var/log/Xorg.0.log
 product id                                 592 
 vendor                                     LGD
xserver.version: 2:1.18.3-1ubuntu2

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

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

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