[ubuntu] Macbook 8,2 EFI install / GPU switching

Dear Ubuntu Community,

I have a macbook 8,2 and want to install ubuntu 12.10. I need both GPUs to work, since i need external display support and decent battery life.

I've found tutorials to :

enable EFI to work on 12.10: http://www.rodsbooks.com/ubuntu-efi/index.html

Full install with switching kinda working?: http://dentifrice.poivron.org/laptops/macbookpro8,2/ However, this one seems to be made for debian (ubuntu?) Oneiric and seems a little bit out of date, i'm not exactly an experienced user and i'm wondering if it'll work.

Full gentoo linux install with switching: http://ck.kennt-wayne.de/2012/jun/ge...o-82-late-2011 well this one is for a completely diferent linux distribution and seems a little bit dated as well, i'm not sure this will work too.

So i'll probably end up trying the first tutorial.

i might also remove rEFInd through this tutorial : http://glandium.org/blog/?p=2830

Unfortunately there seems to be very little information on "graphic switching" and i'm not sure on how to switch between both GPUs.
The https://help.ubuntu.com/community/MacBookPro8-2/Quantal says switching doesn't work. So how do i choose which GPU to boot and use ? i don't mind rebooting each time i need a different GPU.

Best Regards,
SilverOne