I've posted this video where I show one of the problems I'm facing with my UX32VD in regard of external monitors.
As you can see as soon as I plugged the external monitor the laptop screen goes black and the external monitor displays a single color (color changes between red, green and blue).
However this does not always happen. For instance if I reboot the laptop with the external monitor already plugged in I get to use it but not the laptop screen. In the Displays settings the laptop screen it's not even listed.
Other times it just works. The to screens, without any problems. I tried with other to different external monitor and all this apparently random issues repeat, I even tried using HDMI cable instead. Same random behavior.
This question seams to cover one of this issues however the answer did not helped me.
I was forced to use the 3.5.2 kernel in order to use the Intel graphics card else the Gallium something was used. Also I've Bumblebee installed.