I'm trying to stabilize a system running XFree86 4.1 with a Number Nine 
Revolution IV card and an SGI 1600SW display.  I have had serious problems 
in the past where the entire system would lock-up hard when I tried to 
switch virtual consoles.  I've also had problems with VGA font corruption 
each time I was able to get to a text mode console.

After reading an archive posting from March, I added frame buffer support 
to the kernel and the "VGA = 808" line to LILO.  Things are working _much_ 
better now, but I'm still having problems using display managers such as 
GDM and XDM.

I can reliably bring up GDM when the computer first boots to run-level 5, 
and I can reliably login to a single X session.  If I try to reboot the 
computer from within GNOME, it will lock-up hard as soon it's supposed to 
switch to a text mode console.  Logging out of my X session will lock the 
system up hard about 50% of the time on the way back to GDM.  The system 
behaves the same way, if I switch to XDM.

If I boot to run-level 3 and use "startx" to start my X session, I don't 
have any problems rebooting or logging in, starting X, and stopping X 
repeatedly.  While I can continue to operate this way, I'd really rather 
run with a display manager like GDM.

Is there something I can do to GDM, XDM, or the X server itself to keep 
them from crashing the system?  Hardware and software description follows:

HW:  Number Number T2R Revolution IV AGP
      SGI 1600SW Flat-panel display
      Abit KG7 Motherboard
      Athlon 1.4 GHz Processor
      768 Mb of RAM

SW:  Started with a stock Red Hat 7.1 install
      Added Ximian GNOME
      Upgraded to kernel 2.4.9
      Upgraded to XFree86 4.1.0-0.9.13 from Red Hat 7.2 beta RPMs

Current XFree86-4 posted at http://www.ankeny.net/XF86Config-4.

Thanks,
Alan

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