clipped from: abhinay.wordpress.com   
  • Add these lines in the place of your Module Section
    • Section "Module"
Load "bitmap"

Load "ddc"

Load "dbe"

Load "dri"

Load "extmod"

Load "freetype"

Load "glx"

Load "int10"

Load "type1"

Load "vbe"

EndSection
  • Add this line in “Device” Section
    • Option "XAANoOffscreenPixmaps" "true"
  • Add this lines at the end in xorg.conf file
    • Section "Extensions"
Option "Composite" "true"
EndSection
  • And Make sure you have these lines
    • Section "DRI"
Mode    0666
EndSection