try enabling only Vga, adding 2 monitors section :
option Monitor "vga1"
Section "Device"
Identifier "My Graphic Board"
...
Option "Monitor-LVDS1" "lvds"
Option "Monitor-VGA1" "vga"
EndSection
Section "Monitor"
Identifier "vga"
option "Enable" "true"
EndSection
Section "Monitor"
Identifier "lvds"
Option "Ignore" "true"
EndSection
--
Sluggish performance on Intel video card
https://bugs.launchpad.net/bugs/421232
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