It seems that the MGA driver in XFree86 (all versions, AFAIK) does not
support XVideo display in interlaced mode. I'd like to hack it myself,
but I have a hard time finding the specs of the G400 processor (I own a
Millenium G400). Any idea where from I could get those specs? Anyone
interested in helping me?

HTML lesson #42:
The only legitimate use of the greatly loathed tag.

Schroedinger's Cat is NOT dead.