As I recall, the Voodoo 3 only supports 3D acceleration at 16 bit.  This 
is not a driver limitation, but a hardware limitation.

Adam

Kristaps Esterlins wrote:
> Hi, I'm trying to get proper hw acceleration using this 3dfx card so 
> far it's not possible using 1280x1024 @ 24bit depth, which I'm 
> currently using. I need some ideas, suggestions how to fix this :)
>
> dmesg | grep -i drm
> [    0.275903] [drm] Initialized drm 1.1.0 20060810
> [ 6587.330829] [drm] Initialized tdfx 1.0.0 20010216 for 0000:01:00.0 
> on minor 0
>
>  lspci -nn | grep -i VGA
> 01:00.0 VGA compatible controller [0300]: 3Dfx Interactive, Inc. 
> Voodoo 3 [121a:0005] (rev 01)
>
> glxinfo | grep render
> direct rendering: Yes
> OpenGL renderer string: Software Rasterizer
>
> Xorg.conf - http://pastebin.ca/1483668
> Xorg.0.log - http://pastebin.ca/1483667
>
> Thanks.
> ------------------------------------------------------------------------
>
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