FC2/FC3 xorg x11 mga driver problem?

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In short: Fedora Core 2 and Fedora Core 2.90, Matrox Millennium
G400/G450 graphics card, KDE or GNOME, Open Inventor demos flicker
badly on FC2 until the window is moved to a different position, while
with FC1 no such symptoms are experienced on the same machine. The
problem goes away with "Option Accel off", but that slows down 2D
graphics operations (like window movement) too much.

Does anybody have any ideas on what could be the culprit or what I
could test to find out?

To describe the symptoms further, when I start
/usr/lib/Inventor/gview.RUNME e.g., I see only the cleanly rotating
sails of the windmill. The windmill itself flickers and is hardly
visible. When I move the window a few cm, the symptoms go away, and
everything looks good. Does that make sense? But when I move the window
across the screen's border and back to the middle, the flickering is
back. It's the same with all demos.

FC2 binaries and src.rpms here (signed with key 8ff214b4):
ftp://packman.iu-bremen.de/fedora/2

Fedora.us package submission ticket:
https://bugzilla.fedora.us/show_bug.cgi?id=1802


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