Check you have 3D rendering with this command :
glxinfo | grep rendering
Direct rendering should be enabled has czp said
Option “BusType†“PCIâ€Â
in device section should be added.
If it crashes maybe you made a syntax error because it also work like this on Ubuntu.
For that work you must restart your computer (like in Windows
)
Maybe you should check UseFBDev option, I add to uncomment (or set i to false) it I remember.
Check also that your Monitor and Display sections are correct (frequencies and res must be supported).
Example :
Exemple :
SubSection “Displayâ€Â
Depth 24
Modes “1280x1024†“1024x768†“800x600â€Â
EndSubSection
Section “Monitorâ€Â
Identifier “Generic Monitorâ€Â
Option “DPMSâ€Â
HorizSync 28-120
VertRefresh 43-85
EndSection