the trouble comes with xorg. I use Mandriva, not Ubuntu, but I think problems are the same.
Matrox support told me there are no plans for an updated driver this year, but I courageously
decided to upgrade my box from Mandriva 2010.0 to 2010.1, which means from kernel 2.6.31
to 2.6.33 and xorg 1.6.5 to 1.7.7. The mtx driver compiled and installed without error, but
did not work. I downgraded xorg back to 1.6.5, using smart and the 2010.0 RPMs, installed the
driver again, and all works fine