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[davez1980 <765136@xxxxxxxxxxxxxxxxxx>]

I'm having the same problem, also with the Intel chipset (GM45 in my
case).

Here are some snippets from my Xorg.0.log

[  4820.594] 
X.Org X Server 1.10.1
Release Date: 2011-04-15
[  4820.594] X Protocol Version 11, Revision 0
[  4820.594] Build Operating System: Linux 2.6.24-29-server i686 Ubuntu
[  4820.594] Current Operating System: Linux david-laptop 2.6.38-8-generic-pae #42-Ubuntu SMP Mon Apr 11 05:17:09 UTC 2011 i686
[  4820.594] Kernel command line: root=UUID=3311ce7c-f839-469c-bd24-f00efdb49c5b ro quiet splash 
[  4820.594] Build Date: 19 April 2011  03:33:17PM
[  4820.594] xorg-server 2:1.10.1-1ubuntu1 (For technical support please see http://www.ubuntu.com/support) 
[  4820.600] (II) intel: Driver for Intel Integrated Graphics Chipsets: i810,
	i810-dc100, i810e, i815, i830M, 845G, 854, 852GM/855GM, 865G, 915G,
	E7221 (i915), 915GM, 945G, 945GM, 945GME, Pineview GM, Pineview G,
	965G, G35, 965Q, 946GZ, 965GM, 965GME/GLE, G33, Q35, Q33, GM45,
	4 Series, G45/G43, Q45/Q43, G41, B43, B43, Clarkdale, Arrandale,
	Sandybridge, Sandybridge, Sandybridge, Sandybridge, Sandybridge,
	Sandybridge, Sandybridge
[  4820.608] (II) intel(0): Integrated Graphics Chipset: Intel(R) GM45
[  4820.608] (--) intel(0): Chipset: "GM45"91
[  6214.642] 
Backtrace:
[  6214.642] 0: /usr/bin/X (xorg_backtrace+0x3b) [0x80eab1b]
[  6214.642] 1: /usr/bin/X (0x8048000+0x5fac8) [0x80a7ac8]
[  6214.642] 2: (vdso) (__kernel_rt_sigreturn+0x0) [0xb782540c]
[  6214.642] 3: /usr/bin/X (_CallCallbacks+0x3e) [0x8074e1e]
[  6214.642] 4: /usr/bin/X (WriteToClient+0x267) [0x80a7607]
[  6214.642] 5: /usr/lib/xorg/modules/extensions/libdri2.so (ProcDRI2WaitMSCReply+0x62) [0xb73d4bf2]
[  6214.642] 6: /usr/lib/xorg/modules/extensions/libdri2.so (DRI2WaitMSCComplete+0x75) [0xb73d2fc5]
[  6214.642] 7: /usr/lib/xorg/modules/drivers/intel_drv.so (0xb736e000+0x226bc) [0xb73906bc]
[  6214.643] 8: /usr/lib/xorg/modules/drivers/intel_drv.so (0xb736e000+0x87d2) [0xb73767d2]
[  6214.643] 9: /lib/i386-linux-gnu/libdrm.so.2 (drmHandleEvent+0xf5) [0xb73bf665]
[  6214.643] 10: /usr/lib/xorg/modules/drivers/intel_drv.so (0xb736e000+0x7937) [0xb7375937]
[  6214.643] 11: /usr/bin/X (WakeupHandler+0x52) [0x8074602]
[  6214.643] 12: /usr/bin/X (WaitForSomething+0x1ba) [0x80a1f3a]
[  6214.643] 13: /usr/bin/X (0x8048000+0x27f1e) [0x806ff1e]
[  6214.643] 14: /usr/bin/X (0x8048000+0x1a81c) [0x806281c]
[  6214.643] 15: /lib/i386-linux-gnu/libc.so.6 (__libc_start_main+0xe7) [0xb753de37]
[  6214.643] 16: /usr/bin/X (0x8048000+0x1a411) [0x8062411]
[  6214.643] Segmentation fault at address 0xb2b99008
[  6214.643] 
Caught signal 11 (Segmentation fault). Server aborting

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https://bugs.launchpad.net/bugs/765136

Title:
  [natty] X often crashes since upgrade to natty