Have you installed or looked at device3dfx-source?  It is a Debian package
that says: 

This package is the source for the 3Dfx device driver to allow access to
3Dfx boards and seating its MTRR:s correctly without the user having root
privileges.

You can install this into your current kernel by:
1.  First downloading it 'apt-get install device3dfx-source
kernel-source-2.6.5-1-686' or whatever kernel source you need.
2.  Then untar both under the /usr/src/ directory
3.  Copy the Debian kernel config file 'cp /boot/config-2.6.5-1-686
/usr/src/kernel-source*/'
4.  'cd /usr/src/kernel-source* && make-kpkg --append-to-version -1-686
modules_image'  Make sure to use the correct append-to-version by looking at
'uname -r'. For example, 'uname -r' could equal 2.6.5-1-686 or 2.4.25-1-686.
This puts the modules into the correct /lib/ directories.
5.  Install the package 'dpkg -i /usr/src/*.deb'
6.  Find the module and temporarily try it out 'depmod && modprobe -l | grep
3dfx' then something like 'modprobe 3dfx'
7.  If it works then you will want to run 'modconf' to add the module to the
boot up script or just add the modules manually to the end of /etc/modules.

Also take a look at http://www.debianhelp.org

Jeff Rasmussen

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