** Summary changed:

- Xorg crashed with SIGSEGV
+ Xorg crashed with SIGSEGV in NV50ConnectorDestroy() from InitOutput()

** Description changed:

  I remove the nvidia drivers using Hardware drivers tool.
  
  Installed this
  sudo apt-get install xserver-xorg-video-nouveau
  
  
  Edit the xorg.conf and add a line in the Device section:
  
  sudo gedit /etc/X11/xorg.conf
  
  ...
  Section "Device"
  Identifier "Configured Video Device"
  Driver "nouveau"
  EndSection
  ...
  
  reboot the system
  
  My system info
  x...@xpc-desktop:~$ uname -a
  Linux xpc-desktop 2.6.28-11-generic #37-Ubuntu SMP Mon Mar 23 16:40:00 UTC 
2009 x86_64 GNU/Linux
  l...@xpc-desktop:~$ lapci
  bash: lapci: command not found
  x...@xpc-desktop:~$ lspci
  00:00.0 Host bridge: ATI Technologies Inc RS480 Host Bridge (rev 01)
  00:02.0 PCI bridge: ATI Technologies Inc RS480 PCI-X Root Port
  00:06.0 PCI bridge: ATI Technologies Inc RS480 PCI Bridge
  00:18.0 Host bridge: Advanced Micro Devices [AMD] K8 [Athlon64/Opteron] 
HyperTransport Technology Configuration
  00:18.1 Host bridge: Advanced Micro Devices [AMD] K8 [Athlon64/Opteron] 
Address Map
  00:18.2 Host bridge: Advanced Micro Devices [AMD] K8 [Athlon64/Opteron] DRAM 
Controller
  00:18.3 Host bridge: Advanced Micro Devices [AMD] K8 [Athlon64/Opteron] 
Miscellaneous Control
  00:19.0 PCI bridge: ALi Corporation M5249 HTT to PCI Bridge
  00:1c.0 USB Controller: ALi Corporation USB 1.1 Controller (rev 03)
  00:1c.1 USB Controller: ALi Corporation USB 1.1 Controller (rev 03)
  00:1c.2 USB Controller: ALi Corporation USB 1.1 Controller (rev 03)
  00:1c.3 USB Controller: ALi Corporation USB 2.0 Controller (rev 01)
  00:1d.0 Audio device: ALi Corporation High Definition Audio/AC'97 Host 
Controller
  00:1e.0 ISA bridge: ALi Corporation PCI to LPC Controller (rev 31)
  00:1e.1 Bridge: ALi Corporation M7101 Power Management Controller [PMU]
  00:1f.0 IDE interface: ALi Corporation M5229 IDE (rev c7)
  00:1f.1 RAID bus controller: ALi Corporation ULi 5287 SATA (rev 02)
  01:00.0 VGA compatible controller: nVidia Corporation GeForce 8500 GT (rev a1)
  02:00.0 Ethernet controller: Broadcom Corporation NetXtreme BCM5751 Gigabit 
Ethernet PCI Express (rev 01)
  03:15.0 FireWire (IEEE 1394): VIA Technologies, Inc. VT6306 Fire II IEEE 1394 
OHCI Link Layer Controller (rev 80)
  
  ProblemType: Crash
  Architecture: amd64
  Disassembly: 0x7f9df5f370a8:
  DistroRelease: Ubuntu 9.04
  ExecutablePath: /usr/bin/Xorg
  NonfreeKernelModules: nvidia
  Package: xserver-xorg-core 2:1.6.0-0ubuntu4 [modified: 
usr/lib/xorg/modules/extensions/libglx.so]
  ProcAttrCurrent: unconfined
  ProcCmdline: /usr/X11R6/bin/X :0 -br -audit 0 -auth /var/lib/gdm/:0.Xauth 
-nolisten tcp vt7
  ProcEnviron:
   PATH=(custom, no user)
   LANG=en_US.UTF-8
   SHELL=/bin/bash
  ProcVersion: Linux version 2.6.28-11-generic (bui...@crested) (gcc version 
4.3.3 (Ubuntu 4.3.3-5ubuntu4) ) #37-Ubuntu SMP Mon Mar 23 16:40:00 UTC 2009
  Signal: 11
  SourcePackage: xorg-server
- Stacktrace:
-  #0  0x00007f9df5f370a8 in ?? ()
-  #1  0x00007f9dfa0e7010 in ?? ()
-  #2  0x00000000009f6840 in ?? ()
-  #3  0x0000000000000000 in ?? ()
- StacktraceTop:
-  ?? ()
-  ?? ()
-  ?? ()
-  ?? ()
  Title: Xorg crashed with SIGSEGV
  Uname: Linux 2.6.28-11-generic x86_64
- UserGroups:
-  
- glxinfo:
+ Stacktrace:
+ 
+ #0  NV50ConnectorDestroy (pScrn=0x9f6840) at ../../src/nv50_connector.c:103
+       connector = (nouveauConnectorPtr) 0x0
+       pNv = (NVPtr) 0x7f9dfa0e7010
+ #1  0x00007f9df5f0bc22 in NVFreeScreen (scrnIndex=0, 
+     flags=<value optimized out>) at ../../src/nv_driver.c:841
+       pScrn = (ScrnInfoPtr) 0x9f6840
+       pNv = (NVPtr) 0x7f9dfa0e7010
+ #2  0x00007f9df5f0e075 in NVPreInit (pScrn=0x9f6840, 
+     flags=<value optimized out>) at ../../src/nv_driver.c:1518
+       from = <value optimized out>
+       i = -99717104
+       max_width = 8176
+       max_height = 8192
+       clockRanges = (ClockRangePtr) 0x1
+       config_mon_rates = 0
+       regs = (volatile uint32_t *) 0x7f9dfa057000
+       rgbzeros = {red = 0, green = 0, blue = 0}
+       gammazeros = {red = 0, green = 0, blue = 1.15108934e-38}
+ #3  0x000000000046f9ec in InitOutput (pScreenInfo=0x7de280, argc=10, 
+     argv=0x7fff02154988) at ../../../../hw/xfree86/common/xf86Init.c:1008
+       i = 0
+       j = <value optimized out>
+       k = <value optimized out>
+       scr_index = <value optimized out>
+       modulelist = <value optimized out>
+       optionlist = (pointer *) 0x9ff200
+       layout = <value optimized out>
+       screenpix24 = <value optimized out>
+       pix24 = <value optimized out>
+       pix24From = <value optimized out>
+       autoconfig = <value optimized out>
+       configured_device = <value optimized out>
+ #4  0x0000000000433c2e in main (argc=10, argv=0x7fff02154988, 
+     envp=0x7fff021549e0) at ../../dix/main.c:315
+       i = 0
+       alwaysCheckForInput = {0, 1}

-- 
Xorg crashed with SIGSEGV in NV50ConnectorDestroy() from InitOutput()
https://bugs.launchpad.net/bugs/348422
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