Unexpected graphics restart

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I am having this strange problem under RH 8.0 and I am totally stumped
as to the cause.  Every once an awhile( 1 to 2 times a day) I will have
my session crash and go back to the RH login screen.  I don't think
there is any application or action that I am doing that causes it to
happen.  It just happens randomly. Here is my system specs:

RH8.0
gcc3.2
Nvidia Quadro 4 750 XGL
nvidia driver version: 4191

Another effect of this restart is that it kills my graphics
performance.  I can get 30-35 fps in the simulation program that I'm
working on before the restart.  After this crash I get only 8 fps.  The
only way that I have been able to restore the performance is to restart
the computer correctly.

Here is a sample of my /var/log/messages file (Sorry for the length, the
latest crash happened around 13:13 on Jan 27):

Jan 27 07:27:51 oceanus gdm(pam_unix)[5080]: session opened for user slc
by (uid=0)
Jan 27 07:27:55 oceanus modprobe: modprobe: Can't locate module
sound-slot-1
Jan 27 07:27:55 oceanus modprobe: modprobe: Can't locate module
sound-service-1-0
Jan 27 07:27:55 oceanus modprobe: modprobe: Can't locate module
sound-slot-1
Jan 27 07:27:55 oceanus modprobe: modprobe: Can't locate module
sound-service-1-0
Jan 27 07:27:58 oceanus modprobe: modprobe: Can't locate module
sound-slot-1
Jan 27 07:27:58 oceanus modprobe: modprobe: Can't locate module
sound-service-1-0
Jan 27 07:27:58 oceanus modprobe: modprobe: Can't locate module
sound-slot-1
Jan 27 07:27:58 oceanus modprobe: modprobe: Can't locate module
sound-service-1-0
Jan 27 07:28:59 oceanus gconfd (slc-21275): starting (version 1.0.9),
pid 21275
user 'slc'
Jan 27 08:33:14 oceanus su(pam_unix)[22199]: session opened for user
root by slc(uid=1024)
Jan 27 08:33:47 oceanus su(pam_unix)[22199]: session closed for user
root
Jan 27 10:05:19 oceanus userhelper: pam_timestamp: timestamp file
`/var/run/sudo/slc/unknown:root' is too old, disallowing access to
redhat-config-date for UID 1024
Jan 27 10:05:39 oceanus ntpd: ntpd shutdown failed
Jan 27 13:13:39 oceanus gdm(pam_unix)[5080]: session closed for user slc
Jan 27 13:13:39 oceanus gdm[5080]: gdm_slave_xioerror_handler: Fatal X
error -
Restarting :0
Jan 27 13:13:39 oceanus modprobe: modprobe: Can't locate module
char-major-10-134
Jan 27 13:13:48 oceanus gconfd (slc-21275): GConf server is not in use,
shutting down.
Jan 27 13:13:48 oceanus gconfd (slc-21275): Exiting
Jan 27 13:14:00 oceanus gdm(pam_unix)[24368]: session opened for user
slc by (uid=0)
Jan 27 13:14:02 oceanus modprobe: modprobe: Can't locate module
sound-slot-1
Jan 27 13:14:02 oceanus modprobe: modprobe: Can't locate module
sound-service-1-0
Jan 27 13:14:02 oceanus modprobe: modprobe: Can't locate module
sound-slot-1
Jan 27 13:14:02 oceanus modprobe: modprobe: Can't locate module
sound-service-1-0
Jan 27 13:14:05 oceanus modprobe: modprobe: Can't locate module
sound-slot-1
Jan 27 13:14:05 oceanus modprobe: modprobe: Can't locate module
sound-service-1-0
Jan 27 13:14:05 oceanus modprobe: modprobe: Can't locate module
sound-slot-1
Jan 27 13:14:05 oceanus modprobe: modprobe: Can't locate module
sound-service-1-0
Jan 27 13:14:39 oceanus sshd(pam_unix)[24618]: session opened for user
root by (uid=0)
Jan 27 13:18:01 oceanus gconfd (slc-24736): starting (version 1.0.9),
pid 24736 user 'slc'

Thanks in advance,
-- 
Scott Chaney





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