Here's my config for a working voodoo 3k based system. Hope it helps:
# File generated by xf86config.
#
# Copyright (c) 1999 by The XFree86 Project, Inc.
#
# Permission is hereby granted, free of charge, to any person obtaining a
# copy of this software and associated documentation files (the Software),
# to deal in the Software without restriction, including without limitation
# the rights to use, copy, modify, merge, publish, distribute, sublicense,
# and/or sell copies of the Software, and to permit persons to whom the
# Software is furnished to do so, subject to the following conditions:
#
# The above copyright notice and this permission notice shall be included in
# all copies or substantial portions of the Software.
#
# THE SOFTWARE IS PROVIDED AS IS, WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
# IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
# FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
# THE XFREE86 PROJECT BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
# WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF
# OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
# SOFTWARE.
#
# Except as contained in this notice, the name of the XFree86 Project shall
# not be used in advertising or otherwise to promote the sale, use or other
# dealings in this Software without prior written authorization from the
# XFree86 Project.
#
# **
# Refer to the XF86Config(4/5) man page for details about the format of
# this file.
# **
# **
# Module section -- this section is used to specify
# which dynamically loadable modules to load.
# **
#
Section Module
# This loads the DBE extension module.
Loaddbe # Double buffer extension
# This loads the miscellaneous extensions module, and disables
# initialisation of the XFree86-DGA extension within that module.
SubSection extmod
Optionomit xfree86-dga # don't initialise the DGA extension
EndSubSection
# This loads the Type1 and FreeType font modules
Loadtype1
Loadspeedo
Loadfreetype
Loadxtt
# This loads the GLX module
Load glx
# This loads the DRI module
Load dri
EndSection
# **
# Files section. This allows default font and rgb paths to be set
# **
Section Files
# The location of the RGB database. Note, this is the name of the
# file minus the extension (like .txt or .db). There is normally
# no need to change the default.
RgbPath /usr/X11R6/lib/X11/rgb
# Multiple FontPath entries are allowed (which are concatenated together),
# as well as specifying multiple comma-separated entries in one FontPath
# command (or a combination of both methods)
#
# If you don't have a floating point coprocessor and emacs, Mosaic or other
# programs take long to start up, try moving the Type1 and Speedo directory
# to the end of this list (or comment them out).
#
FontPath unix/:7100
FontPath /usr/X11R6/lib/X11/fonts/local/
FontPath /usr/X11R6/lib/X11/fonts/misc/
FontPath /usr/X11R6/lib/X11/fonts/75dpi/:unscaled
FontPath /usr/X11R6/lib/X11/fonts/100dpi/:unscaled
FontPath /usr/X11R6/lib/X11/fonts/Speedo/
FontPath /usr/X11R6/lib/X11/fonts/Type1/
FontPath /usr/X11R6/lib/X11/fonts/TTF/
FontPath /usr/X11R6/lib/X11/fonts/freefont/
FontPath /usr/X11R6/lib/X11/fonts/75dpi/
FontPath /usr/X11R6/lib/X11/fonts/100dpi/
# The module search path. The default path is shown here.
ModulePath /usr/X11R6/lib/modules
EndSection
# **
# Server flags section.
# **
Section ServerFlags
# Uncomment this to cause a core dump at the spot where a signal is
# received. This may leave the console in an unusable state, but may
# provide a better stack trace in the core dump to aid in debugging
#Option NoTrapSignals
# Uncomment this to disable the CrtlAltFn VT switch sequence
# (where n is 1 through 12). This allows clients to receive these key
# events.
#Option DontVTSwitch
# Uncomment this to disable the CrtlAltBS server abort sequence
# This allows clients to receive this key event.
#Option DontZap
# Uncomment this to disable the CrtlAltKP_+/KP_- mode switching
# sequences. This allows clients to receive these key events.
#Option Dont Zoom
# Uncomment this to disable tuning with the xvidtune client. With
# it the client can still run and fetch card and
