On current Mesa CVS (2006.05.07) Blender works on Matrox G450, but there are many artifacts in rendering. There are no artifacts in indirect rendering, there are also no artifacts on same Mesa and r300.
These artifacts are visible when cursor changes from arrow to something else, for example after TAB, to see them one just need to open menu (space). This is probably related to bug 1236 *** This bug has been marked as a duplicate of 1236 ***
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