I recently brought up XFree (4.3.x) for the first time on my SGI 1600SW 
monitor and Number Nine Revolution IV video card (it uses the "i128" 
driver). When it runs, it runs fine, but it seems that the *2nd* time I 
logout (or switch virtual consoles away from the X display) the system 
locks up hard (doesn't respond to pings, keyboard is dead). I did a google 
search and found an XFree86 mailing list post from a couple years ago where 
somebody said they eliminated the logout problem by adding:

	DisplayManager*resetSignal:     15

  to /etc/X11/xdm/xdm-config.
	
(http://xfree86.desiato.de/xfree86/pipermail/xpert/2001-March/006636.html)

This doesn't help my logout lockups though (and obviously wouldn't help the 
lockup when switching virtual consoles).

Has anybody else experienced this on their system? How did you fix it?

(Man, this machine has a bad average! So far the builtin ethernet and audio 
don't work, and the video locks up the system. Good thing I'm just 
tinkering around with it, and don't need to actually get anything done ;-)