minimized windows - sometimes white rectangles are shown instead of window previews

[Alistair Buxton]

I have no idea what causes this. It just happens randomly. See screenshot. They should all be terminal windows.

ProblemType: Bug
DistroRelease: Ubuntu 11.10
Package: unity 4.22.0-0ubuntu2
ProcVersionSignature: Ubuntu 3.0.0-12.19-generic 3.0.4
Uname: Linux 3.0.0-12-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: ""
.proc.driver.nvidia.version:
 NVRM version: NVIDIA UNIX x86_64 Kernel Module 280.13 Wed Jul 27 16:53:56 PDT 2011
 GCC version: gcc version 4.6.1 (Ubuntu/Linaro 4.6.1-9ubuntu3)
.tmp.unity.support.test.0:

ApportVersion: 1.23-0ubuntu2
Architecture: amd64
CompizPlugins: [core,bailer,detection,composite,opengl,compiztoolbox,decor,resize,snap,place,mousepoll,move,gnomecompat,grid,vpswitch,imgpng,wall,session,unitymtgrabhandles,regex,animation,expo,workarounds,fade,ezoom,scale,unityshell]
CompositorRunning: compiz
Date: Fri Oct 7 01:46:17 2011
DistUpgraded: Fresh install
DistroCodename: oneiric
DistroVariant: ubuntu
DkmsStatus: nvidia-current, 280.13, 3.0.0-12-generic, x86_64: installed
GraphicsCard:
 nVidia Corporation GT215 [GeForce GT 240] [10de:0ca3] (rev a2) (prog-if 00 [VGA controller])
   Subsystem: Giga-byte Technology Device [1458:34e2]
InstallationMedia: Ubuntu 11.10 "Oneiric Ocelot" - Beta amd64 (20110921.2)
JockeyStatus:
 xorg:nvidia_current - NVIDIA accelerated graphics driver (Proprietary, Enabled, In use)
 xorg:nvidia_current_updates - NVIDIA accelerated graphics driver (post-release updates) (Proprietary, Disabled, Not in use)
MachineType: System manufacturer System Product Name
ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-3.0.0-12-generic root=UUID=e201088a-cec2-4b74-a583-bc7991dabd32 ro quiet splash vt.handoff=7
SourcePackage: unity
UpgradeStatus: No upgrade log present (probably fresh install)
dmi.bios.date: 11/25/2009
dmi.bios.vendor: American Megatrends Inc.
dmi.bios.version: 0704
dmi.board.asset.tag: To Be Filled By O.E.M.
dmi.board.name: M4A79XTD EVO
dmi.board.vendor: ASUSTeK Computer INC.
dmi.board.version: Rev X.0X
dmi.chassis.asset.tag: Asset-1234567890
dmi.chassis.type: 3
dmi.chassis.vendor: Chassis Manufacture
dmi.chassis.version: Chassis Version
dmi.modalias: dmi:bvnAmericanMegatrendsInc.:bvr0704:bd11/25/2009:svnSystemmanufacturer:pnSystemProductName:pvrSystemVersion:rvnASUSTeKComputerINC.:rnM4A79XTDEVO:rvrRevX.0X:cvnChassisManufacture:ct3:cvrChassisVersion:
dmi.product.name: System Product Name
dmi.product.version: System Version
dmi.sys.vendor: System manufacturer
version.compiz: compiz 1:0.9.6+bzr20110929-0ubuntu3
version.ia32-libs: ia32-libs 20090808ubuntu25
version.libdrm2: libdrm2 2.4.26-1ubuntu1
version.libgl1-mesa-dri: libgl1-mesa-dri 7.11-0ubuntu3
version.libgl1-mesa-dri-experimental: libgl1-mesa-dri-experimental N/A
version.libgl1-mesa-glx: libgl1-mesa-glx 7.11-0ubuntu3
version.nvidia-graphics-drivers: nvidia-graphics-drivers N/A
version.xserver-xorg: xserver-xorg 1:7.6+7ubuntu7
version.xserver-xorg-input-evdev: xserver-xorg-input-evdev 1:2.6.0-1ubuntu13
version.xserver-xorg-video-ati: xserver-xorg-video-ati 1:6.14.99~git20110811.g93fc084-0ubuntu1
version.xserver-xorg-video-intel: xserver-xorg-video-intel 2:2.15.901-1ubuntu2
version.xserver-xorg-video-nouveau: xserver-xorg-video-nouveau 1:0.0.16+git20110411+8378443-1

[Alistair Buxton (a-j-buxton)]

Note, this happens with other programs than gnome terminal, including firefox.

[Launchpad Janitor (janitor)]

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

[ubuntuuser (fancker)]

Actually it happens with Firefox every time I minimize a Firefox window.

[Omer Akram (om26er)]

I does not happen every time, If there are any specific steps to reproduce this problem those will be very helpful for us to get it fixed in Ubuntu.

[Alistair Buxton (a-j-buxton)]

I can consistently reproduce this bug as follows:

1. Open a terminal window.
2. Maximize it.
3. Minimize it.
4. Switch to workspace 2 (ctrl-alt-right)
5. Middle click terminal launcher to open a new window.
6. Left click terminal launcher to show spread.

The window from workspace 1 now shows the white rectangle.

[ubuntuuser (fancker)]

OK, you are right it only happens when I minimize a maximized firefox window.

[ubuntuuser (fancker)]

I tried somewhat more and it seem to behave this way for Firefox and Chrome:

Firefox
- minimize a maximized window -> always white rectangle
- minimize a smaller window -> never white rectangle

Chrome
- minimize a maximized window -> always white rectangle
- minimize a smaller window -> every second try white rectangle

[Alistair Buxton (a-j-buxton)]

This bug is still present in Precise and Unity 5.2rc1.