Ubuntu How to get HDMI to work on Dell XPS 15 L502X

I installed ubuntu 11.04 on Dell XPS L502x , Everything works except HDMI.
I am not able to make my external monitor work using HDMI.
I tried noveau as well as the nVida graphics from "additional drivers" but nothing seems to work.
once there was a black screen with _ on the external monitor using noveau and the ubuntu desktop on laptop's screen , if i pressed ctrl + alt + f1 , i would take me there and desktop would freeze , i could exit it by ctrl + alt + f7

pls post step by step instructions

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