basic steps to getting dual head display to work with a dual head Matrox G450 and X:
- install X and make sure it works with a single monitor
- grab the 'Linux' drivers from the Matrox site - http://www.matrox.com/mga/support/drivers/files/lnx_21.cfm- unpack them, and replace your existing mga*.o files with these new ones
- grab this example XF86Config file - http://www.numbersix.net/stuff/XF86Config.dual. If you're used to XF86Config most of this will be fairly self explanitory
- Note the xinerama line to make it one big desktop rather than two seperate ones.
That should be it. This was done on FreeBSD 5.0, but the same should work for Linux. Even works with Gnome :) Now I have to fix these weird fonts Mozilla insists on using.