lgashu,
thanks alot man, finally i made the display to work on E6520 based on your extra, but installation based on unifail. I think you are right that mine may be Nvidia card, but when I boot in windows, it shows me as HD3000. I am even confused. Only 2 things pending are Audio and Wifi. I will go by your suggestion regarding Wifi. But Audio is still a puzzle to me. I will look into it. Still booting needs -x flag, but I can live with it.
Thanks a lot for all your help. We need more people like you, who takes time for others. .