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[Bug 729979] [NEW] Windows sometimes become blank when changing focus to them in natty


Public bug reported:

Binary package hint: compiz

When switching focus from one window to another, the target window may
become blank. See the attached screenshot, where I opened two gnome-
terminals and clicked on their titlebars alternately - the issue was
triggered after about 5-10 clicks. I've had this happen on other
appications too, e.g. software-centre, empathy, etc.

Doing shade+unshade, maximizing or clicking away from the problematic
window usually makes the window contents come back. The window remains
responsive to both keyboard and mouse (by the way, in the screenshot the
mouse cursor was an I-beam before I pressed PrtScr).

This is on up-to-date natty, installed from scratch using the daily
image from the 1st of March.

ProblemType: Bug
DistroRelease: Ubuntu 11.04
Package: compiz 1:0.9.4-0ubuntu3
ProcVersionSignature: Ubuntu 2.6.38-5.32-generic 2.6.38-rc6
Uname: Linux 2.6.38-5-generic x86_64
NonfreeKernelModules: nvidia
.proc.driver.nvidia.gpus.0: Error: [Errno 21] Is a directory: '/proc/driver/nvidia/gpus/0'
.proc.driver.nvidia.registry: Binary: ""
 NVRM version: NVIDIA UNIX x86_64 Kernel Module  270.29  Wed Feb 23 16:18:35 PST 2011
 GCC version:  gcc version 4.5.2 (Ubuntu/Linaro 4.5.2-3ubuntu3)
Architecture: amd64
CompizPlugins: [core,bailer,detection,composite,opengl,decor,imgsvg,resize,resizeinfo,mousepoll,wall,regex,animation,place,blur,compiztoolbox,text,session,grid,put,imgpng,imgjpeg,gnomecompat,commands,copytex,wobbly,annotate,move,vpswitch,workarounds,expo,ezoom,staticswitcher,fade,scale,scaleaddon,unityshell]
CompositorRunning: compiz
Date: Sun Mar  6 02:42:49 2011
DistUpgraded: Log time: 2011-03-03 20:05:16.908415
DistroCodename: natty
DistroVariant: ubuntu
DkmsStatus: nvidia-current, 270.29, 2.6.38-5-generic, x86_64: installed
 nVidia Corporation ION VGA [GeForce 9400M] [10de:0876] (rev b1) (prog-if 00 [VGA controller])
   Subsystem: ASUSTeK Computer Inc. Device [1043:8402]
InstallationMedia: Ubuntu 11.04 "Natty Narwhal" - Alpha amd64 (20110301.1)
InstallationMedia_: Ubuntu 11.04 "Natty Narwhal" - Alpha amd64 (20110301.1)
JockeyStatus: xorg:nvidia_current - NVIDIA accelerated graphics driver (Proprietary, Enabled, In use)
 Bus 004 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub
 Bus 003 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub
 Bus 002 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
 Bus 001 Device 002: ID 13d3:5126 IMC Networks 
 Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
MachineType: ASUSTeK Computer INC. 1201N
PackageArchitecture: all
 PATH=(custom, user)
ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-2.6.38-5-generic root=UUID=56551fbd-03c7-48af-b7f4-c8f165bc66ed ro quiet splash vt.handoff=7
ProcVersionSignature_: Ubuntu 2.6.38-5.32-generic 2.6.38-rc6
Renderer: Unknown
SourcePackage: compiz
UpgradeStatus: Upgraded to natty on 2011-03-03 (2 days ago)
dmi.bios.date: 04/29/2010
dmi.bios.vendor: American Megatrends Inc.
dmi.bios.version: 0326
dmi.board.asset.tag: To Be Filled By O.E.M.
dmi.board.name: 1201N
dmi.board.vendor: ASUSTeK Computer INC.
dmi.board.version: x.xx
dmi.chassis.asset.tag: 0x00000000
dmi.chassis.type: 10
dmi.chassis.vendor: ASUSTeK Computer INC.
dmi.chassis.version: x.x
dmi.modalias: dmi:bvnAmericanMegatrendsInc.:bvr0326:bd04/29/2010:svnASUSTeKComputerINC.:pn1201N:pvrx.x:rvnASUSTeKComputerINC.:rn1201N:rvrx.xx:cvnASUSTeKComputerINC.:ct10:cvrx.x:
dmi.product.name: 1201N
dmi.product.version: x.x
dmi.sys.vendor: ASUSTeK Computer INC.
version.compiz: compiz 1:0.9.4-0ubuntu3
version.libdrm2: libdrm2 2.4.23-1ubuntu3
version.libgl1-mesa-glx: libgl1-mesa-glx 7.10.1~git20110215.cc1636b6-0ubuntu2
version.nvidia-graphics-drivers: nvidia-graphics-drivers N/A
version.xserver-xorg: xserver-xorg 1:7.6~3ubuntu11
version.xserver-xorg-video-ati: xserver-xorg-video-ati 1:6.14.0-0ubuntu2
version.xserver-xorg-video-intel: xserver-xorg-video-intel 2:2.14.0-4ubuntu1
version.xserver-xorg-video-nouveau: xserver-xorg-video-nouveau 1:0.0.16+git20110107+b795ca6e-0ubuntu5

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

** Tags: amd64 apport-bug compiz-0.9 natty running-unity ubuntu

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  Windows sometimes become blank when changing focus to them in natty

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