Black/Blank screen when open/close apps

[Mehdi Hassanpour]

I've upgraded to Ubuntu 14.04 and I see a full black screen for a second when I open or close an application! I can type while I see this Black screen so my pc is not hanged!

This happens even when I open a new tab in FF or Chrome...

ProblemType: Bug
DistroRelease: Ubuntu 14.04
Package: unity 7.2.0+14.04.20140416-0ubuntu1
ProcVersionSignature: Ubuntu 3.13.0-24.46-generic 3.13.9
Uname: Linux 3.13.0-24-generic i686
NonfreeKernelModules: nvidia
.proc.driver.nvidia.gpus.0: Error: [Errno 21] Is a directory: '/proc/driver/nvidia/gpus/0'
.proc.driver.nvidia.registry: Binary: ""
.proc.driver.nvidia.version:
 NVRM version: NVIDIA UNIX x86 Kernel Module 304.117 Tue Nov 26 21:36:39 PST 2013
 GCC version: gcc version 4.8.2 (Ubuntu 4.8.2-19ubuntu1)
.tmp.unity.support.test.0:

ApportVersion: 2.14.1-0ubuntu3
Architecture: i386
CompizPlugins: [core,bailer,detection,composite,opengl,decor,mousepoll,vpswitch,regex,animation,snap,expo,move,compiztoolbox,place,grid,imgpng,gnomecompat,wall,ezoom,workarounds,resize,fade,unitymtgrabhandles,scale,session,unityshell]
CompositorRunning: compiz
CompositorUnredirectDriverBlacklist: '(nouveau|Intel).*Mesa 8.0'
CompositorUnredirectFSW: true
CurrentDesktop: Unity
Date: Mon Apr 21 17:51:48 2014
DistUpgraded: 2013-05-04 10:21:25,017 DEBUG enabling apt cron job
DistroCodename: trusty
DistroVariant: ubuntu
DkmsStatus:
 bbswitch, 0.7, 3.13.0-24-generic, i686: installed
 nvidia-304-updates, 304.117, 3.13.0-24-generic, i686: installed
GraphicsCard:
 NVIDIA Corporation G86 [GeForce 8400 GS] [10de:0422] (rev a1) (prog-if 00 [VGA controller])
   Subsystem: Elitegroup Computer Systems Device [1019:1808]
InstallationDate: Installed on 2011-08-10 (984 days ago)
InstallationMedia: Ubuntu 11.04 "Natty Narwhal" - Release i386 (20110427.1)
MachineType: ECS P43T-A2
ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-3.13.0-24-generic root=UUID=050c1275-d8d6-4868-819c-9c86bafc0ed0 ro quiet splash
SourcePackage: unity
UpgradeStatus: Upgraded to trusty on 2013-05-04 (352 days ago)
dmi.bios.date: 06/19/2008
dmi.bios.vendor: American Megatrends Inc.
dmi.bios.version: 080015
dmi.board.asset.tag: To Be Filled By O.E.M.
dmi.board.name: P43T-A2
dmi.board.vendor: ECS
dmi.board.version: 1.0
dmi.chassis.asset.tag: To Be Filled By O.E.M.
dmi.chassis.type: 3
dmi.chassis.vendor: ECS
dmi.chassis.version: 1.0
dmi.modalias: dmi:bvnAmericanMegatrendsInc.:bvr080015:bd06/19/2008:svnECS:pnP43T-A2:pvr1.0:rvnECS:rnP43T-A2:rvr1.0:cvnECS:ct3:cvr1.0:
dmi.product.name: P43T-A2
dmi.product.version: 1.0
dmi.sys.vendor: ECS
version.compiz: compiz 1:0.9.11+14.04.20140409-0ubuntu1
version.libdrm2: libdrm2 2.4.52-1
version.libgl1-mesa-dri: libgl1-mesa-dri 10.1.0-4ubuntu5
version.libgl1-mesa-dri-experimental: libgl1-mesa-dri-experimental N/A
version.libgl1-mesa-glx: libgl1-mesa-glx 10.1.0-4ubuntu5
version.nvidia-graphics-drivers: nvidia-graphics-drivers N/A
version.xserver-xorg-core: xserver-xorg-core 2:1.15.1-0ubuntu2
version.xserver-xorg-input-evdev: xserver-xorg-input-evdev 1:2.8.2-1ubuntu2
version.xserver-xorg-video-ati: xserver-xorg-video-ati 1:7.3.0-1ubuntu3
version.xserver-xorg-video-intel: xserver-xorg-video-intel 2:2.99.910-0ubuntu1
version.xserver-xorg-video-nouveau: xserver-xorg-video-nouveau 1:1.0.10-1ubuntu2
xserver.bootTime: Sun Apr 20 19:44:26 2014
xserver.configfile: default
xserver.devices:
 input Power Button KEYBOARD, id 6
 input Power Button KEYBOARD, id 7
 input AT Translated Set 2 keyboard KEYBOARD, id 8
 input ImPS/2 Generic Wheel Mouse MOUSE, id 9
xserver.errors:
 open /dev/dri/card0: No such file or directory
 open /dev/fb0: No such file or directory
xserver.logfile: /var/log/Xorg.0.log
xserver.outputs:

xserver.version: 2:1.15.1-0ubuntu2

[Launchpad Janitor (janitor)]

Status changed to 'Confirmed' because the bug affects multiple users.

[Mehdi Hassanpour (mehdi)]

As a workaround, I un-ticked the "Allow Flipping" box under OpenGL settings of the NVIDIA x Server Settings.