I'm getting a similar error in an upgraded kubuntu (from 9.10 to 10.04)
on 64 bit hardware. There is nothing in Xorg.log files to indicate a
whole X crash, but my ~/.xsession-error has similar output:

XIO:  fatal IO error 104 (Connection reset by peer) on X server ":0.0"
      after 394169 requests (394168 known processed) with 3 events remaining.
kxkb: Fatal IO error: client killed
kded4: Fatal IO error: client killed
kdeinit4: Fatal IO error: client killed
kdeinit4: sending SIGHUP to children.
. . .
(followed by 150+ lines of application crashes, see attached xsession-errors 
for the full output).

I just posted a thread at ubuntuforums.org (before I saw this) in case anyone 
wants to follow whatever discussion results there: 
http://ubuntuforums.org/showthread.php?p=9300254  (that thread also complains 
about the hundreds of thousands of lines of output from kmail/kontact and 
amarok that are needlessly being thrown into xsession-errors, which is probably 
not relevant to the crashing).

$ lspci
00:00.0 Host bridge: Intel Corporation Mobile 4 Series Chipset Memory 
Controller Hub (rev 07)
00:02.0 VGA compatible controller: Intel Corporation Mobile 4 Series Chipset 
Integrated Graphics Controller (rev 07)
00:02.1 Display controller: Intel Corporation Mobile 4 Series Chipset 
Integrated Graphics Controller (rev 07)
00:03.0 Communication controller: Intel Corporation Mobile 4 Series Chipset MEI 
Controller (rev 07)
00:03.3 Serial controller: Intel Corporation Mobile 4 Series Chipset AMT SOL 
Redirection (rev 07)
00:19.0 Ethernet controller: Intel Corporation 82567LM Gigabit Network 
Connection (rev 03)
00:1a.0 USB Controller: Intel Corporation 82801I (ICH9 Family) USB UHCI 
Controller #4 (rev 03)
00:1a.1 USB Controller: Intel Corporation 82801I (ICH9 Family) USB UHCI 
Controller #5 (rev 03)
00:1a.2 USB Controller: Intel Corporation 82801I (ICH9 Family) USB UHCI 
Controller #6 (rev 03)
00:1a.7 USB Controller: Intel Corporation 82801I (ICH9 Family) USB2 EHCI 
Controller #2 (rev 03)
00:1b.0 Audio device: Intel Corporation 82801I (ICH9 Family) HD Audio 
Controller (rev 03)
00:1c.0 PCI bridge: Intel Corporation 82801I (ICH9 Family) PCI Express Port 1 
(rev 03)
00:1c.1 PCI bridge: Intel Corporation 82801I (ICH9 Family) PCI Express Port 2 
(rev 03)
00:1c.3 PCI bridge: Intel Corporation 82801I (ICH9 Family) PCI Express Port 4 
(rev 03)
00:1d.0 USB Controller: Intel Corporation 82801I (ICH9 Family) USB UHCI 
Controller #1 (rev 03)
00:1d.1 USB Controller: Intel Corporation 82801I (ICH9 Family) USB UHCI 
Controller #2 (rev 03)
00:1d.2 USB Controller: Intel Corporation 82801I (ICH9 Family) USB UHCI 
Controller #3 (rev 03)
00:1d.7 USB Controller: Intel Corporation 82801I (ICH9 Family) USB2 EHCI 
Controller #1 (rev 03)
00:1e.0 PCI bridge: Intel Corporation 82801 Mobile PCI Bridge (rev 93)
00:1f.0 ISA bridge: Intel Corporation ICH9M-E LPC Interface Controller (rev 03)
00:1f.2 SATA controller: Intel Corporation ICH9M/M-E SATA AHCI Controller (rev 
03)
00:1f.3 SMBus: Intel Corporation 82801I (ICH9 Family) SMBus Controller (rev 03)
03:00.0 Network controller: Intel Corporation Wireless WiFi Link 5300



** Attachment added: ".xsession-errors following the described crash"
   http://launchpadlibrarian.net/48464424/xcrash.3

-- 
X server crashes randomly
https://bugs.launchpad.net/bugs/573957
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