Tweaking XFree for 2D cards by hand ?

[Vincent Trouilliez]

I am trying to trouble-shoot H/W problems.

I would like to try switching from the on-board 3D Nvidia video chip, to
an old, PCI, Matrox Millenum card, which I guess had no 3D functions
whatsoever given it's era ?

I need to modify XF86Config-4 by hand, since the config tool always
fails to create a new file.

I will have to remove the nvidia driver ("nvidia-glx" package), but
then, there are a bunch of modules loaded in XF86Config-4, I assume some
of them must be removed when not using a 3D card (?), or is it safe to
leave them all loaded even if they are not used ?

I see the following modules :

"GLcore"
"bitmap"
"dbe"
"ddc"
"dri"
"extmod"
"freetype"
"glx"
"int10"
"record"
"speedo"
"type1"
"v4l"
"vbe"
"xtt"

I don't know what 99% of them mean. But I think "dri" and "GLcore" and
"glx" might have to do with 3D cards ? Should I remove them ?

Any info/help gracefully received... 

Vince