I decided to ssh into the machine and tail a few logs then brought up
the gnome-screensaver settings dialog and here are the errors I got.

 tail -f Xorg.0.log
(II) intel(0): Modeline "1280x1024"x0.0  108.00  1280 1328 1440 1688  1024 1025 
1028 1066 +hsync +vsync (64.0 kHz)
(II) intel(0): Modeline "800x600"x0.0   40.00  800 840 968 1056  600 601 605 
628 +hsync +vsync (37.9 kHz)
(II) intel(0): Modeline "640x480"x0.0   31.50  640 656 720 840  480 481 484 500 
-hsync -vsync (37.5 kHz)
(II) intel(0): Modeline "640x480"x0.0   25.18  640 656 752 800  480 490 492 525 
-hsync -vsync (31.5 kHz)
(II) intel(0): Modeline "720x400"x0.0   28.32  720 738 846 900  400 412 414 449 
-hsync +vsync (31.5 kHz)
(II) intel(0): Modeline "1280x1024"x0.0  135.00  1280 1296 1440 1688  1024 1025 
1028 1066 +hsync +vsync (80.0 kHz)
(II) intel(0): Modeline "1024x768"x0.0   78.75  1024 1040 1136 1312  768 769 
772 800 +hsync +vsync (60.0 kHz)
(II) intel(0): Modeline "1024x768"x0.0   65.00  1024 1048 1184 1344  768 771 
777 806 -hsync -vsync (48.4 kHz)
(II) intel(0): Modeline "800x600"x0.0   49.50  800 816 896 1056  600 601 604 
625 +hsync +vsync (46.9 kHz)
(II) intel(0): Modeline "1152x864"x0.0  108.00  1152 1216 1344 1600  864 865 
868 900 +hsync +vsync (67.5 kHz)

Fatal server error:
Failed to submit batchbuffer: Input/output error


Please consult the The X.Org Foundation support
         at http://wiki.x.org
 for help.
Please also check the log file at "/var/log/Xorg.0.log" for additional 
information.

(II) Power Button: Close
(II) UnloadModule: "evdev"
(II) Power Button: Close
(II) UnloadModule: "evdev"
(II) LITEON Technology USB Multimedia Keyboard: Close
(II) UnloadModule: "evdev"
(II) LITEON Technology USB Multimedia Keyboard: Close
(II) UnloadModule: "evdev"
(II) Microsoft Microsoft 5-Button Mouse with IntelliEye(TM): Close
(II) UnloadModule: "evdev"
(II) Macintosh mouse button emulation: Close
(II) UnloadModule: "evdev"
(II) AIGLX: Suspending AIGLX clients for VT switch
 ddxSigGiveUp: Closing log


tail -f /var/log/messages
Apr  7 11:31:00 giftshopcustomer-desktop kernel: [   14.930497] type=1505 
audit(1270661460.142:6):  t3"
Apr  7 11:31:00 giftshopcustomer-desktop kernel: [   14.936243] type=1505 
audit(1270661460.150:7):  orkManager/nm-dhcp-client.action"
Apr  7 11:31:00 giftshopcustomer-desktop kernel: [   14.936630] type=1505 
audit(1270661460.150:8):  man/scripts/dhclient-script"
Apr  7 11:31:00 giftshopcustomer-desktop kernel: [   14.951262] type=1505 
audit(1270661460.162:9):
Apr  7 11:31:00 giftshopcustomer-desktop kernel: [   14.970028] type=1505 
audit(1270661460.182:10): -previewer"
Apr  7 11:31:00 giftshopcustomer-desktop kernel: [   14.980648] type=1505 
audit(1270661460.194:11): -thumbnailer"
Apr  7 11:31:01 giftshopcustomer-desktop kernel: [   16.041852] 
ADDRCONF(NETDEV_UP): eth0: link is n
Apr  7 11:31:01 giftshopcustomer-desktop kernel: [   16.044180] e100: eth0 NIC 
Link is Up 100 Mbps F
Apr  7 11:31:01 giftshopcustomer-desktop kernel: [   16.044376] 
ADDRCONF(NETDEV_CHANGE): eth0: link
Apr  7 11:31:20 giftshopcustomer-desktop pulseaudio[1117]: ratelimit.c: 1 
events suppressed
Apr  7 11:36:30 giftshopcustomer-desktop pulseaudio[1757]: pid.c: Stale PID 
file, overwriting.
Apr  7 11:36:31 giftshopcustomer-desktop pulseaudio[1757]: main.c: Unable to 
contact D-Bus: org.freedesktop.DBus.Error.NoServer: Failed to connect to socket 
/tmp/dbus-lJiDksISzC: Connection refused


/var/log$ tail -f syslog
Apr  7 11:31:08 giftshopcustomer-desktop rtkit-daemon[1119]: Supervising 4 
threads of 2 processes of
Apr  7 11:31:08 giftshopcustomer-desktop pulseaudio[1194]: pid.c: Daemon 
already running.
Apr  7 11:31:09 giftshopcustomer-desktop acpid: client connected from 
1216[107:114]
Apr  7 11:31:09 giftshopcustomer-desktop acpid: 1 client rule loaded
Apr  7 11:31:09 giftshopcustomer-desktop kernel: [   25.920053] end_request: 
I/O error, dev fd0, sec
Apr  7 11:31:09 giftshopcustomer-desktop kernel: [   25.948042] end_request: 
I/O error, dev fd0, sec
Apr  7 11:31:09 giftshopcustomer-desktop kernel: [   26.372013] eth0: no IPv6 
routers present
Apr  7 11:31:20 giftshopcustomer-desktop pulseaudio[1117]: ratelimit.c: 1 
events suppressed
Apr  7 11:31:43 giftshopcustomer-desktop gnome-session[993]: WARNING: Detected 
that screensaver has
Apr  7 11:32:10 giftshopcustomer-desktop AptDaemon: INFO: Initializing daemon
Apr  7 11:36:07 giftshopcustomer-desktop anacron[1158]: Job `cron.daily' started
Apr  7 11:36:07 giftshopcustomer-desktop anacron[1699]: Updated timestamp for 
job `cron.daily' to 2010-04-07
Apr  7 11:36:29 giftshopcustomer-desktop kernel: [  346.388015] 
[drm:i915_hangcheck_elapsed] *ERROR* Hangcheck timer elapsed... GPU hung
Apr  7 11:36:29 giftshopcustomer-desktop kernel: [  346.388031] render error 
detected, EIR: 0x00000000
Apr  7 11:36:29 giftshopcustomer-desktop kernel: [  346.388052] 
[drm:i915_do_wait_request] *ERROR* i915_do_wait_request returns -5 (awaiting 
3524 at 3523)
Apr  7 11:36:30 giftshopcustomer-desktop acpid: client 837[0:0] has disconnected
Apr  7 11:36:30 giftshopcustomer-desktop acpid: client connected from 1760[0:0]
Apr  7 11:36:30 giftshopcustomer-desktop acpid: 1 client rule loaded
Apr  7 11:36:30 giftshopcustomer-desktop pulseaudio[1757]: pid.c: Stale PID 
file, overwriting.
Apr  7 11:36:31 giftshopcustomer-desktop pulseaudio[1757]: main.c: Unable to 
contact D-Bus: org.freedesktop.DBus.Error.NoServer: Failed to connect to socket 
/tmp/dbus-lJiDksISzC: Connection refused
Apr  7 11:36:31 giftshopcustomer-desktop gdm-binary[720]: WARNING: GdmDisplay: 
display lasted 0.665068 seconds
Apr  7 11:36:31 giftshopcustomer-desktop acpid: client 1760[0:0] has 
disconnected
Apr  7 11:36:31 giftshopcustomer-desktop acpid: client connected from 1769[0:0]
Apr  7 11:36:31 giftshopcustomer-desktop acpid: 1 client rule loaded
Apr  7 11:36:31 giftshopcustomer-desktop gdm-binary[720]: WARNING: GdmDisplay: 
display lasted 0.392763 seconds
Apr  7 11:36:31 giftshopcustomer-desktop acpid: client 1769[0:0] has 
disconnected
Apr  7 11:36:31 giftshopcustomer-desktop acpid: client connected from 1776[0:0]
Apr  7 11:36:31 giftshopcustomer-desktop acpid: 1 client rule loaded
Apr  7 11:36:31 giftshopcustomer-desktop gdm-binary[720]: WARNING: GdmDisplay: 
display lasted 0.390680 seconds
Apr  7 11:36:31 giftshopcustomer-desktop acpid: client 1776[0:0] has 
disconnected
Apr  7 11:36:31 giftshopcustomer-desktop acpid: client connected from 1783[0:0]
Apr  7 11:36:31 giftshopcustomer-desktop acpid: 1 client rule loaded
Apr  7 11:36:32 giftshopcustomer-desktop gdm-binary[720]: WARNING: GdmDisplay: 
display lasted 0.391870 seconds
Apr  7 11:36:32 giftshopcustomer-desktop acpid: client 1783[0:0] has 
disconnected
Apr  7 11:36:32 giftshopcustomer-desktop acpid: client connected from 1790[0:0]
Apr  7 11:36:32 giftshopcustomer-desktop acpid: 1 client rule loaded
Apr  7 11:36:32 giftshopcustomer-desktop gdm-binary[720]: WARNING: GdmDisplay: 
display lasted 0.389481 seconds
Apr  7 11:36:32 giftshopcustomer-desktop acpid: client 1790[0:0] has 
disconnected
Apr  7 11:36:32 giftshopcustomer-desktop acpid: client connected from 1797[0:0]
Apr  7 11:36:32 giftshopcustomer-desktop acpid: 1 client rule loaded
Apr  7 11:36:33 giftshopcustomer-desktop gdm-binary[720]: WARNING: GdmDisplay: 
display lasted 0.397483 seconds
Apr  7 11:36:33 giftshopcustomer-desktop gdm-binary[720]: WARNING: 
GdmLocalDisplayFactory: maximum number of X display failures reached: check X 
server log for errors
Apr  7 11:36:33 giftshopcustomer-desktop init: gdm main process (720) 
terminated with status 1
Apr  7 11:36:33 giftshopcustomer-desktop acpid: client 1797[0:0] has 
disconnected
Apr  7 11:36:33 giftshopcustomer-desktop acpid: client connected from 1813[0:0]
Apr  7 11:36:33 giftshopcustomer-desktop acpid: 1 client rule loaded

-- 
System Crash observed when Screensaver settings were being set
https://bugs.launchpad.net/bugs/556722
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