I noticed that to have 3D accelerated, you had to add monitor section for each 
output 
try modifying xorg.conf as follow :

in the device   section add :

Option          "monitor-VGA1" "vga"

Option          "monitor-LVDS1" "lvds"

 
EndSection section add :

and  2 monitor sections :

Section "Monitor"
        Identifier      "vga"

EndSection

Section "Monitor"
        Identifier      "lvds"
Option "Ignore"  "true"

EndSection

-- 
Slow rendering opengl and CPU 100% (intel gma945)
https://bugs.launchpad.net/bugs/565163
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