Found this nice snippet at
"Oh, you've got the same problem I had a few days ago, sorry I forgot to
precise: the new TNT glx module works only with XFree 3.3.6. Using 3.3.5
you only get software rendering. (I did this mistake too...) (you can
verify this by reading the X output, it says "### Creating new xmesa
contex for Riva...", or "### Creating new xmesa context for sw" when you
allocate a new GL context, with xf-3.3.5 it's only sw).
I upgraded and it works again for me (with the same 20000228 module and
SuSE 6.1 using a TNT2)."
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