According to Martin, Matrox P series video card are not properly supported and even more ignored by the support staff when it comes to Linux support, despite it being advertised on the box. Looks like we are sort of back to 1996 when Matrox was refusing to provide the spec for XFree86 to write proper MGA/Millenium drivers.

Too bad Matrox, you would be able to gain back some market share with the Linux folks by just making the right decision instead of being worse than your competitors.