I have 2 graphic cards :

Bus 0, device 11, function 0:
VGA compatible controller: S3 Inc. 86c988 [ViRGE/VX] (rev 2).
IRQ 10.
Master Capable. Latency=32. Min Gnt=4.Max Lat=255.
Non-prefetchable 32 bit memory at 0xdc000000 [0xdfffffff].
Bus 0, device 12, function 0:
Multimedia video controller: 3Dfx Interactive, Inc. Voodoo 2 (rev 2).
Prefetchable 32 bit memory at 0xe2000000 [0xe2ffffff].

What shall I do in order to use the second one?

I tryed to edit the XF86Config file, adding in the "Device section" the appropriate "BusID" entries, but It doesn't work. I always get a message like

(II) Primary Device is: PCI 00:0b:0

and then GNOME starts only if the BusID entry says nothing different from that default!.

Here follow the attempt I have made, if anybody can give me a hint...

------------------------------------------------------------------------------------------------------


This input

Section "Device"
Identifier "S3_VIRGE"
Driver "s3virge"
EndSection

produced this log

(II) S3VIRGE: driver (version 1.8.6) for S3 ViRGE chipsets: virge, 86C325,
virge vx, 86C988, virge dx, virge gx, 86C375, 86C385, virge gx2,
86C357, virge mx, 86C260, virge mx+, 86C280, trio 3d, 86C365,
trio 3d/2x, 86C362, 86C368
(II) Primary Device is: PCI 00:0b:0
(--) Assigning device section with no busID to primary device
(--) Chipset virge vx found


THIS IS THE CASE THAT WORKS
------------------------------------------------------------------------------
This input

Section "Device"
Identifier "S3_VIRGE"
Driver "s3virge"
BusID "PCI:0:11:0"
EndSection

produced this log

(II) S3VIRGE: driver (version 1.8.6) for S3 ViRGE chipsets: virge, 86C325,
virge vx, 86C988, virge dx, virge gx, 86C375, 86C385, virge gx2,
86C357, virge mx, 86C260, virge mx+, 86C280, trio 3d, 86C365,
trio 3d/2x, 86C362, 86C368
(II) Primary Device is: PCI 00:0b:0
(--) Chipset virge vx found

------------------------------------------------------------------------------
This input

Section "Device"
Identifier "S3_VIRGE"
Driver "s3virge"
BusID "PCI:0:0b:0"
EndSection

produced this log

(II) S3VIRGE: driver (version 1.8.6) for S3 ViRGE chipsets: virge, 86C325,
virge vx, 86C988, virge dx, virge gx, 86C375, 86C385, virge gx2,
86C357, virge mx, 86C260, virge mx+, 86C280, trio 3d, 86C365,
trio 3d/2x, 86C362, 86C368
(II) Primary Device is: PCI 00:0b:0
(WW) S3VIRGE: No matching Device section for instance (BusID PCI:0:11:0) found
(EE) No devices detected.

Fatal server error:
no screens found
-------------------------------------------------------------------------------i
This input

Section "Device"
Identifier "Voodoo2"
Driver "tdfx"
BusID "PCI:0:12:0"
EndSection

produced this log

(II) TDFX: Driver for 3dfx Banshee/Voodoo3 chipsets: 3dfx Banshee,
3dfx Voodoo3, 3dfx Voodoo5
(II) Primary Device is: PCI 00:0b:0
(EE) No devices detected.

Fatal server error:
no screens found
-------------------------------------------------------------------------------
This input

Section "Device"
Identifier "S3_VIRGE"
Driver "s3virge"
BusID "PCI:0:12:0"
EndSection

produced this log

(II) S3VIRGE: driver (version 1.8.6) for S3 ViRGE chipsets: virge, 86C325,
virge vx, 86C988, virge dx, virge gx, 86C375, 86C385, virge gx2,
86C357, virge mx, 86C260, virge mx+, 86C280, trio 3d, 86C365,
trio 3d/2x, 86C362, 86C368
(II) Primary Device is: PCI 00:0b:0
(WW) S3VIRGE: No matching Device section for instance (BusID PCI:0:11:0) found
(EE) No devices detected.

Fatal server error:
no screens found

The Voodoo 2 can not operate in 2d mode. It will pass through the signal from your S3 card until the Voodoo's glide (3d) is activated, at which point it will intercept the signal and show the 3d video.

The tdfx driver only supports either Vodoo 2 Banshee (which was a Voodoo 2 with added 2d support) or Voodoo3 and up. It will not work with a standard Voodoo 2.

Once upon a time I know someone was working on a little hack to emuate 2d on the Voodoo/Voodoo2 cards, but I do not know what became of it, I gave up on my Voodoo several years ago. In any case, it would be low resoultion, low refresh rate and max 16 bpp colour. In general pretty lousy image quality for 2d.

Cheers,
Odie