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mysterious X lockups on Sarge

Hi all,

For several weeks now, I've been having X lock up on me occasionally, 
and I'm a bit stumped as to where to start debugging it...

I'm running Sarge on a P4 3.2 HT, and my video card is a GeForce FX 
5200 using the nvidia binary driver.  I've had this problem on both a 
home-rolled 2.4.22 kernel and the Debian 2.6.7-SMP kernel-package.

Every couple of days or so X seems to die an abrupt death.  The display 
will freeze completely, keyboard input has no effect (including 
CTRL-ALT-F1 and CTRL-ALT-BACKSPACE).  The system is still running, 
though: If XMMS is playing when the problem hits, the music keeps on 
going; and I can ssh in to the box no problem.  If I kill -9 the XDM and 
/usr/X11R6/bin/X processes then the screen goes black... but then doing 
/etc/init.d/xdm start just silently fails.  So I've been ssh-ing in just 
to reboot the box.

Now, I've had this happen while I was surfing the web, and while the 
screensaver was running, and sometimes after the monitor has gone to 
sleep (oh, and once in the middle of a game of armagetron).

A "tail" of XFree86.0.log shows a bunch of GetModeLine entries, but 
nothing that looks like error or panic or "ack! I'm dying!"...
I've done an 8-hr run of memtest86 with no complaints at all, the 
temperature seems to be happy, and loading the crap out of the system 
doesn't make it fail (I tried 5 hours of a kernel-compile loop, and 2 
hours of cpuburn with no problems).

So where do I start looking to figure out what's causing this and/or to 
fix it.

	Thanks for any help
            I do not agree with what you have to say,
            but I'll defend to the death your right to say it.
            - Voltaire
--------------------------<<Please do not CC me>>--------------------------

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