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[Bug 709461] Re: Application windows can sometimes fail to display and will mask regions of the screen


** Description changed:

  Binary package hint: unity
  On 2 separate machines  w/ updated as of 1/28 -
  On rare occasions a window will open in the top left corner with top deco buried.  The most likely for this to happen is a utility window like  update manager.
  After pulling back down into the desktop (Alt+click) it may or may not show some graphical distortion (window split in 2 parts), if so it returns to normal if opening any other window.
  What does appear to happen is an invisible window is created in the
  area where it was pulled down to, this only happens on the current
  workspace, any others are unaffected
  Attached xwininfo - first shows on affected workspace, 2nd when
  switching to another and clicking in same spot
  Note that this does not always happen, I'm thinking the 'buried' window
  may need to show some distorttion, not sure yet
  ### IMPORTANT ###
- This can cause the central area of the screen (where the Alt-Tab switcher is drawn) to be unclickable. This also happens on Classic desktop.
- ### REPRODUCTION STEPS (thanks to glennric) ###
- 1. Log in
- 2. Open a terminal and move it away from the center of the screen where the switcher will appear. Make sure that it still has focus.
- 3. Hold down Alt-Tab to activate and show the switcher. Sometimes you need to call the switcher twice.
- 4. While the switcher is still visible move the mouse to a point right above the very bottom of the gray switcher window (it should be window titles area, not thumbnails area, within 1-5 pixels of the bottom is sufficient)
- 5. Click there. You will see that the desktop does not take focus, and the terminal window still has focus. If you run xwininfo you can click at that location and you will see information about a window that you can't see, and that is definitely not the background nautilus window.
+ This can cause some areas of the screen to be unclickable. This also happens on Classic desktop.
  ProblemType: Bug
  DistroRelease: Ubuntu 11.04
  Package: unity 3.2.16-0ubuntu1
  ProcVersionSignature: Ubuntu 2.6.38-1.27-generic 2.6.38-rc2
  Uname: Linux 2.6.38-1-generic i686
  NonfreeKernelModules: nvidia
   NVRM version: NVIDIA UNIX x86 Kernel Module  173.14.28  Wed Sep 29 09:47:25 PDT 2010
   GCC version:  gcc version 4.5.2 (Ubuntu/Linaro 4.5.2-2ubuntu1)
  Architecture: i386
  Date: Fri Jan 28 14:36:27 2011
  DistUpgraded: Fresh install
  DistroCodename: natty
  DistroVariant: ubuntu
   nvidia-current, 260.19.29, 2.6.37-12-generic, i686: installed
   nvidia-current, 260.19.29, 2.6.38-1-generic, i686: installed
   nvidia-173, 173.14.28, 2.6.37-12-generic, i686: installed
   nvidia-173, 173.14.28, 2.6.38-1-generic, i686: installed
  GraphicsCard:   Subsystem: Dell Device [1028:0209]
  InstallationMedia: Ubuntu 11.04 "Natty Narwhal" - Alpha i386 (20110120)
  InstallationMedia_: Ubuntu 11.04 "Natty Narwhal" - Alpha i386 (20110120)
  MachineType: Dell Inc. XPS M1330
   PATH=(custom, user)
  ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-2.6.38-1-generic root=UUID=28d68c1b-9e85-45a3-9ec2-ad4f992ba387 ro
  ProcVersionSignature_: Ubuntu 2.6.38-1.27-generic 2.6.38-rc2
  SourcePackage: unity
  dmi.bios.date: 12/26/2008
  dmi.bios.vendor: Dell Inc.
  dmi.bios.version: A15
  dmi.board.vendor: Dell Inc.
  dmi.chassis.type: 8
  dmi.chassis.vendor: Dell Inc.
  dmi.modalias: dmi:bvnDellInc.:bvrA15:bd12/26/2008:svnDellInc.:pnXPSM1330:pvr:rvnDellInc.:rn:rvr:cvnDellInc.:ct8:cvr:
  dmi.product.name: XPS M1330
  dmi.sys.vendor: Dell Inc.
  version.libdrm2: libdrm2 2.4.23-1ubuntu3
  version.libgl1-mesa-glx: libgl1-mesa-glx 7.10-1ubuntu1
  version.nvidia-graphics-drivers: nvidia-graphics-drivers N/A
  version.xserver-xorg: xserver-xorg 1:7.5+6ubuntu8
  version.xserver-xorg-video-ati: xserver-xorg-video-ati 1:6.13.2+git20110124.fadee040-0ubuntu1
  version.xserver-xorg-video-intel: xserver-xorg-video-intel 2:2.14.0-1ubuntu2
  version.xserver-xorg-video-nouveau: xserver-xorg-video-nouveau 1:0.0.16+git20110107+b795ca6e-0ubuntu1

** Tags removed: patch

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  Application windows can sometimes fail to display and will mask
  regions of the screen