ubuntu reboted while i was working why?

[unix1adm]

ubuntu crashed. how do i find out why
I was surfing the net and al of a sudden the laptop IBM r51 just loged me out went down and came back up really fast.

Here is some of the syslog info....

I dont understand what went wrong.


Jan 20 20:07:39 cj454-lt gdmgreeter[7011]: Gtk-WARNING: Unable to locate theme engine in module_path: "ubuntulooks",
Jan 20 20:07:45 cj454-lt pulseaudio[7131]: ltdl-bind-now.c: Failed to find original dlopen loader.
Jan 20 20:07:45 cj454-lt pulseaudio[7134]: pid.c: Stale PID file, overwriting.
Jan 20 20:07:45 cj454-lt pulseaudio[7134]: main.c: setrlimit(RLIMIT_NICE, (31, 31)) failed: Operation not permitted
Jan 20 20:07:45 cj454-lt pulseaudio[7134]: main.c: setrlimit(RLIMIT_RTPRIO, (9, 9)) failed: Operation not permitted
Jan 20 20:07:56 cj454-lt x-session-manager[7031]: WARNING: Application 'gnome-wm.desktop' failed to register before timeout
Jan 20 20:08:06 cj454-lt x-session-manager[7031]: WARNING: Application 'libcanberra-login-sound.desktop' failed to register before timeout
Jan 20 20:08:06 cj454-lt pulseaudio[7134]: module-x11-xsmp.c: X11 session manager not running.
Jan 20 20:08:06 cj454-lt pulseaudio[7134]: module.c: Failed to load module "module-x11-xsmp" (argument: ""): initialization failed.
Jan 20 20:08:08 cj454-lt anacron[7388]: Anacron 2.3 started on 2009-01-20
Jan 20 20:08:08 cj454-lt anacron[7388]: Normal exit (0 jobs run)
Jan 20 20:09:10 cj454-lt kernel: [ 2866.531552] ppdev0: registered pardevice
Jan 20 20:09:10 cj454-lt kernel: [ 2866.580984] ppdev0: unregistered pardevice
Jan 20 20:09:12 cj454-lt kernel: [ 2868.044627] ppdev0: registered pardevice
Jan 20 20:09:12 cj454-lt hp: io/hpmud/pp.c 627: unable to read device-id ret=-1
Jan 20 20:09:12 cj454-lt kernel: [ 2868.092689] ppdev0: unregistered pardevice
Jan 20 20:09:13 cj454-lt kernel: [ 2868.791825] ppdev0: registered pardevice
Jan 20 20:09:13 cj454-lt python: io/hpmud/pp.c 627: unable to read device-id ret=-1
Jan 20 20:09:13 cj454-lt kernel: [ 2868.840176] ppdev0: unregistered pardevice
Jan 20 20:17:01 cj454-lt /USR/SBIN/CRON[7571]: (root) CMD ( cd / && run-parts --report /etc/cron.hourly)

[unix1adm]

some more info at the top i missed

Jan 20 20:02:06 cj454-lt -- MARK --
Jan 20 20:07:35 cj454-lt kernel: [ 2771.019142] compiz.real[5523]: segfault at 2c0 ip 08055c8c sp bfeffa10 error 4 in compiz.real[8048000+34000]
Jan 20 20:07:35 cj454-lt gdm[5049]: WARNING: gdm_slave_xioerror_handler: Fatal X error - Restarting :0
Jan 20 20:07:35 cj454-lt bonobo-activation-server (cj454-6956): could not associate with desktop session: Failed to connect to socket /tmp/dbus-Yr3jJBLkHg: Connection refused
Jan 20 20:07:36 cj454-lt acpid: client connected from 6996[0:0]
Jan 20 20:07:36 cj454-lt kernel: [ 2772.533725] agpgart-intel 0000:00:00.0: AGP 2.0 bridge
Jan 20 20:07:36 cj454-lt kernel: [ 2772.533784] agpgart-intel 0000:00:00.0: putting AGP V2 device into 4x mode
Jan 20 20:07:36 cj454-lt kernel: [ 2772.533850] pci 0000:01:00.0: putting AGP V2 device into 4x mode
Jan 20 20:07:37 cj454-lt kernel: [ 2772.758449] [drm] Setting GART location based on new memory map
Jan 20 20:07:37 cj454-lt kernel: [ 2772.758478] [drm] Loading R100 Microcode
Jan 20 20:07:37 cj454-lt kernel: [ 2772.758538] [drm] writeback test succeeded in 2 usecs
Jan 20 20:07:39 cj454-lt gdmgreeter[7011]: Gtk-WARNING: Unable to locate theme engine in module_path: "ubuntulooks",
Jan 20 20:07:45 cj454-lt pulseaudio[7131]: ltdl-bind-now.c: Failed to find original dlopen loader.
Jan 20 20:07:45 cj454-lt pulseaudio[7134]: pid.c: Stale PID file, overwriting.
Jan 20 20:07:45 cj454-lt pulseaudio[7134]: main.c: setrlimit(RLIMIT_NICE, (31, 31)) failed: Operation not permitted
Jan 20 20:07:45 cj454-lt pulseaudio[7134]: main.c: setrlimit(RLIMIT_RTPRIO, (9, 9)) failed: Operation not permitted
Jan 20 20:07:56 cj454-lt x-session-manager[7031]: WARNING: Application 'gnome-wm.desktop' failed to register before timeout
Jan 20 20:08:06 cj454-lt x-session-manager[7031]: WARNING: Application 'libcanberra-login-sound.desktop' failed to register before timeout
Jan 20 20:08:06 cj454-lt pulseaudio[7134]: module-x11-xsmp.c: X11 session manager not running.
Jan 20 20:08:06 cj454-lt pulseaudio[7134]: module.c: Failed to load module "module-x11-xsmp" (argument: ""): initialization failed.
Jan 20 20:08:08 cj454-lt anacron[7388]: Anacron 2.3 started on 2009-01-20
Jan 20 20:08:08 cj454-lt anacron[7388]: Normal exit (0 jobs run)
Jan 20 20:09:10 cj454-lt kernel: [ 2866.531552] ppdev0: registered pardevice
Jan 20 20:09:10 cj454-lt kernel: [ 2866.580984] ppdev0: unregistered pardevice
Jan 20 20:09:12 cj454-lt kernel: [ 2868.044627] ppdev0: registered pardevice
Jan 20 20:09:12 cj454-lt hp: io/hpmud/pp.c 627: unable to read device-id ret=-1
Jan 20 20:09:12 cj454-lt kernel: [ 2868.092689] ppdev0: unregistered pardevice
Jan 20 20:09:13 cj454-lt kernel: [ 2868.791825] ppdev0: registered pardevice
Jan 20 20:09:13 cj454-lt python: io/hpmud/pp.c 627: unable to read device-id ret=-1
Jan 20 20:09:13 cj454-lt kernel: [ 2868.840176] ppdev0: unregistered pardevice
Jan 20 20:17:01 cj454-lt /USR/SBIN/CRON[7571]: (root) CMD ( cd / && run-parts --report /etc/cron.hourly)

[D-cat]

It doesn't look like you actually rebooted, but rather X crashed and restarted. The fault appears to be in Compiz (the 3D desktop). If it keeps up, I'd just disable compiz (it's definitely cool, but it's also eye candy you don't need, and last I used it, it used up hardware 3D resources so I couldn't run 3D GL games right). If it doesn't keep crashing on you, then you may be able to just ignore it.