http://www.xfree86.org/4.3.0/Status29.html#29

XFree86 -configure

To load 3D modules :

# file:///etc/XF86Config-4

Section "Module"
Load  "dri" 	# 3d @ http://dri.sf.net
Load  "glx" 	# 3d @ http://mesa3d.org
Load  "GLcore" 	# 3d @ http://opengl.org
...

# insmod agpgart agp_try_unsupported=1

# dmesg
Linux agpgart interface v0.99 (c) Jeff Hartmann
agpgart: Maximum main memory to use for agp memory: 190M
agpgart: Trying generic Via routines for device id: 0605
agpgart: AGP aperture is 64M @ 0xec000000

# glxinfo
name of display: :0.0
Xlib:  extension "XFree86-DRI" missing on display":0.0".

I suppose the /etc/X11/XF86Config-4 # Device/driver option should be modifiied to the appropritate driver try :

xf86cfg -textmode

# cat /var/log/XFree*.0.log donne les infos suivantes

XFree86 Version 4.3.0 (Fedora Core 1: 4.3.0-55)
Release Date: 15 August 2003
X Protocol Version 11, Revision 0, Release 6.6
Build Operating System: Linux 2.4.21-9.ELsmp i686 [[ELF]]
Build Date: 12 February 2004
...
(II) Loading sub module "vgahw"
(II) LoadModule: "vgahw"
(II) Loading /usr/X11R6/lib/modules/libvgahw.a
(II) Module vgahw: vendor="The XFree86 Project"
       compiled for 4.3.0, module version = 0.1.0
      ABI class: XFree86 Video Driver, version 0.6
(**) SAVAGE(0): Depth 16, (--) framebuffer bpp 16
(==) SAVAGE(0): RGB weight 565
(==) SAVAGE(0): Default visual is TrueColor
(II) SAVAGE(0): vgaHWGetIOBase: hwp->IOBase is 0x03d0,
hwp->PIOOffset is 0x0000
(==) SAVAGE(0): Using HW cursor
(==) SAVAGE(0): Using video BIOS to set modes
(II) Loading sub module "int10"
(II) LoadModule: "int10"
(II) Loading /usr/X11R6/lib/modules/linux/libint10.a
(II) Module int10: vendor="The XFree86 Project"
       compiled for 4.3.0, module version = 1.0.0
      ABI class: XFree86 Video Driver, version 0.6
(II) SAVAGE(0): Primary V_BIOS segment is: 0xc000

(II) SAVAGE(0): VESA BIOS detected
(II) SAVAGE(0): VESA VBE Version 2.0
(II) SAVAGE(0): VESA VBE Total Mem: 15296 kB
(II) SAVAGE(0): VESA VBE OEM: S3 Incorporated. Twister BIOS
(II) SAVAGE(0): VESA VBE OEM Software Rev: 1.0
(II) SAVAGE(0): VESA VBE OEM Vendor: S3 Incorporated.
(II) SAVAGE(0): VESA VBE OEM Product: VBE 2.0
(II) SAVAGE(0): VESA VBE OEM Product Rev: Rev 1.1
(--) SAVAGE(0): Chip: id 8d01, "Twister PN133"
(--) SAVAGE(0): Engine: "ProSavage"
(--) SAVAGE(0): mapping MMIO @ 0xe8100000 with size 0x80000
(==) SAVAGE(0): Using gamma correction (1.0, 1.0, 1.0)
(--) SAVAGE(0): probed videoram:  16384k
(--) SAVAGE(0): Detected current MCLK value of 14.318 MHz
...

http://www.probo.com/timr/savage40.html