I have found a workarround to use the `mga' driver again: I activated
the kernel framebuffer interface in the device section of the X.org
configuration file /etc/X11/xorg.conf (Option "UseFBDev" "true").

Section "Device"
        Identifier      "Matrox Graphics, Inc. MGA G200"
        Driver          "mga"
        BusID           "PCI:1:6:0"
        Option          "UseFBDev"              "true"
        Option          "OldDmaInit"            "True"
EndSection

I haven't tested it with the default ubuntu kernel, but with my self-
compiled 2.6.18-rc6, I had to load the  `matroxfb_base' before starting
the X-Server. If you compile the matrox framebuffer into the kernel, you
shouldn't notice any problems. If you have compiled it as a module, you
should add `matroxfb_base' to your /etc/modules file.

-- 
Matrox MGA200 doesn't work after upgrade from Dapper to Edgy
https://launchpad.net/bugs/58721

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