Comment 82 for bug 292214

to jo and all whichfind it useful,

here is the description of what I did:

I have a standard Ubuntu 9.10 installation - xserver-xorg-video-mga, version 1:1.4.11.dfsg-1, my adapter is Matrox Millenium G550 (Matrox Graphics, Inc. MGA G550 AGP (rev 01) - from lspci).

I downloaded patched driver from here: http://launchpadlibrarian.net/32153149/mga_drv.so and copied it to /usr/lib/xorg/modules/drivers/ (after backing up the original version).

Then I created xorg.conf (attached).
You probably have to change HorizSync and VertRefresh lines according to your monitors specifications. For the first try you don't need them at all. You also don't need the "Display" subsections at the begining, I added them when it already worked, just to set up preferred resolutions.