Hey!
I have a Dell XPS15 L502X with Nvidia GeForce GT 525M switchable with Intel HD Graphics accelerator. I have Ubuntu 11.04 but I am aware there is some issue with Optimus and it.
I found many threads and posts for the solution for the above but couldn't make all of it.

I am all new to 'acpi', 'bumblebee' etc.

Can someone post step-by-step procedure for the solution?

There is a thread which is regularly updated here.
though I can't make much from it.

I just dont want to use my Nvidia card as I use Ubuntu for only light tasks!

Thanks a lot and appreciate it!