So here how I did it ...
First before installing Ubuntu 12.04LTS, go into BIOS set-up change the Graphics mode to Integrated option and then install ubuntu.
Imp Note: Do not select Graphics Mode to Switchable option until you finish step 1 below. As you're drivers will mess up!!!
Next follow these two steps from doomsword2001 guide below.
Update: I just found that my fan is getting hotter. I try figure it out asap, bit busy now!.
=D>Thanks to ahepas1999, BlinkinCat, Temujin for sharing their valuable info.
PS: I cannot guarantee it will work for you, but it worked for me.