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[Fabio Marconi <marconifabio@xxxxxxxxxxxxx>]

Hello Patrick
to switch from compiz to metacity and viceversa, by terminal:
sudo metacity --replace 
(to use metacity), this is just a temporarily switch that disable every special effect and gives you the base desktop (without cube or others compiz plugins), at the reboot your system will be restored as ususal, if you don't want to reboot, simply
sudo compiz --replace
Is possible also in graphical way, but actually i cannot remeber how,because i upgraded to natty months ago.
Well seems that our bugbot detect something interesting:
Backtrace:
[ 12698.351] 0: /usr/bin/X (xorg_backtrace+0x3b) [0x80ef31b]
[ 12698.351] 1: /usr/bin/X (0x8048000+0x5d00d) [0x80a500d]
[ 12698.351] 2: (vdso) (__kernel_rt_sigreturn+0x0) [0x14e40c]
[ 12698.351] 3: /usr/bin/X (FreeClientResources+0xed) [0x80655ad]
[ 12698.352] 4: /usr/bin/X (FreeAllResources+0x60) [0x8065680]
[ 12698.352] 5: /usr/bin/X (0x8048000+0x1a606) [0x8062606]
[ 12698.352] 6: /lib/libc.so.6 (__libc_start_main+0xe7) [0x2c2ce7]
[ 12698.352] 7: /usr/bin/X (0x8048000+0x1a1b1) [0x80621b1]
[ 12698.352] Backtrace:
[ 12698.351] 0: /usr/bin/X (xorg_backtrace+0x3b) [0x80ef31b]
[ 12698.351] 1: /usr/bin/X (0x8048000+0x5d00d) [0x80a500d]
[ 12698.351] 2: (vdso) (__kernel_rt_sigreturn+0x0) [0x14e40c]
[ 12698.351] 3: /usr/bin/X (FreeClientResources+0xed) [0x80655ad]
[ 12698.352] 4: /usr/bin/X (FreeAllResources+0x60) [0x8065680]
[ 12698.352] 5: /usr/bin/X (0x8048000+0x1a606) [0x8062606]
[ 12698.352] 6: /lib/libc.so.6 (__libc_start_main+0xe7) [0x2c2ce7]
[ 12698.352] 7: /usr/bin/X (0x8048000+0x1a1b1) [0x80621b1]
[ 12698.352] Segmentation fault at address 0x4
[ 12698.352] 
Caught signal 11 (Segmentation fault). Server aborting

This is a serious problem in the graphical Xorg server, so i mark this issue as confirmed.
Thanks to reporting this issue.
Fabio

** Changed in: xserver-xorg-video-intel (Ubuntu)
       Status: Incomplete => Confirmed

** Description changed:

+ [ 12698.352] Segmentation fault at address 0x4
+ 
  When the mouse pointer closes a window by left click on the top-right
  button and the application takes a while to quit, a popup-window tells
  that the application has hung and you can select "wait" or "force quit".
  
  On my netbook this popup comes very often and I'm annoyed by it, because it sets the focus to the popup when I've started to work with an other window. What about having a popup that doesn't bring the hung window to front nor changes focus to the popup-window. I need to manually switch to the hung application to get the popup.
- --- 
+ ---
  Architecture: i386
  DRM.card0.LVDS.1:
-  status: connected
-  enabled: enabled
-  dpms: On
-  modes: 1366x768
-  edid-base64: AP///////wBMo1I0AAAAAAAUAQOAFg14CoWVmVdPjyYhUFQAAAABAQEBAQEBAQEBAQEBAQEBOhtWe1AADDAwICUA330AAAAZAAAADwAAAAAAAAAAAB60AnQAAAAA/gBTQU1TVU5HCiAgICAgAAAA/gAxMDFBVDAzLTgwMQogAEA=
+  status: connected
+  enabled: enabled
+  dpms: On
+  modes: 1366x768
+  edid-base64: AP///////wBMo1I0AAAAAAAUAQOAFg14CoWVmVdPjyYhUFQAAAABAQEBAQEBAQEBAQEBAQEBOhtWe1AADDAwICUA330AAAAZAAAADwAAAAAAAAAAAB60AnQAAAAA/gBTQU1TVU5HCiAgICAgAAAA/gAxMDFBVDAzLTgwMQogAEA=
  DRM.card0.VGA.1:
-  status: disconnected
-  enabled: disabled
-  dpms: On
-  modes: 
-  edid-base64:
+  status: disconnected
+  enabled: disabled
+  dpms: On
+  modes:
+  edid-base64:
  DistroRelease: Ubuntu 10.10
  InstallationMedia: Ubuntu 10.10 "Maverick Meerkat" - Release i386 (20101007)
  MachineType: SAMSUNG ELECTRONICS CO., LTD. NF110/NF210/NF310
  NonfreeKernelModules: wl
  Package: xorg 1:7.5+6ubuntu3
  PackageArchitecture: i386
  ProcCmdLine: BOOT_IMAGE=/vmlinuz-2.6.35-28-generic root=/dev/mapper/hostname-root ro quiet splash
  ProcEnviron:
-  LANG=en_US.utf8
-  SHELL=/bin/bash
+  LANG=en_US.utf8
+  SHELL=/bin/bash
  ProcVersionSignature: Ubuntu 2.6.35-28.50-generic 2.6.35.11
  Tags: maverick maverick
  Uname: Linux 2.6.35-28-generic i686
  UserGroups: adm admin cdrom dialout lpadmin plugdev sambashare
  dmi.bios.date: 03/08/2011
  dmi.bios.vendor: Phoenix Technologies Ltd.
  dmi.bios.version: 04MY.M033.20110308.JIP
  dmi.board.asset.tag: SAMSUNG
  dmi.board.name: NF110/NF210/NF310
  dmi.board.vendor: SAMSUNG ELECTRONICS CO., LTD.
  dmi.board.version: Not Applicable
  dmi.chassis.asset.tag: No Asset Tag
  dmi.chassis.type: 10
  dmi.chassis.vendor: SAMSUNG ELECTRONICS CO., LTD.
  dmi.chassis.version: N/A
  dmi.modalias: dmi:bvnPhoenixTechnologiesLtd.:bvr04MY.M033.20110308.JIP:bd03/08/2011:svnSAMSUNGELECTRONICSCO.,LTD.:pnNF110/NF210/NF310:pvrNotApplicable:rvnSAMSUNGELECTRONICSCO.,LTD.:rnNF110/NF210/NF310:rvrNotApplicable:cvnSAMSUNGELECTRONICSCO.,LTD.:ct10:cvrN/A:
  dmi.product.name: NF110/NF210/NF310
  dmi.product.version: Not Applicable
  dmi.sys.vendor: SAMSUNG ELECTRONICS CO., LTD.
  glxinfo: Error: [Errno 2] No such file or directory
  system:
-  distro:             Ubuntu
-  codename:           maverick
-  architecture:       i686
-  kernel:             2.6.35-28-generic
+  distro:             Ubuntu
+  codename:           maverick
+  architecture:       i686
+  kernel:             2.6.35-28-generic

-- 
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which is subscribed to xserver-xorg-video-intel in Ubuntu.
https://bugs.launchpad.net/bugs/571305

Title:
  gnome "application not responding" when exiting