Re: Matrox G450 DualHead and mga_hal module

[Alexander Shen <sasha.shen@gmail.com>]

had the same problem - tried several things, but it seems that after  
copying files mga_drv.so and mga_hal_drv.so from matrox site to /usr/ 
lib/xorg/modules/drivers (the first one replaces the existing file  
with the same name in this directory) and adding

Section "ServerFlags"
    Option "IgnoreABI" "True"
EndSection

to the X configuration file,

it seems to work for now...