[all variants] Macbook Pro 15" retina (Model 10,1) - how to disable nVidia display adapter?

I've been at this for days. The two major prolems are the wireless (still unsolved) and the high power consumption. The high power consumption is most likely because Ubuntu is using the discrete nVidia adapter all the time (vs the integrated intel one). I'm running Xubuntu 12.10 now, tried Ubuntu 12.10 ..+mac iso too and raring daily. (On raring I didn't know about the vgaswitcheroo yet, so might still try that later).

I think I'm close, if I do this in a text-mode tty (ctrl-alt-fn-f1):
- sudo /etc/init.d/lightdm stop
- sudo su
- echo DIGD > /sys/kernel/debug/vgaswitcheroo

Then the screen goes blank, so the intel adapter is probably in use. The computer doesn't crash, for example sudo reboot still works.

I've tried lots of things to get it to work including:
- Kernel 3.7: http://kernel.ubuntu.com/~kernel-ppa...7-rc2-quantal/
- initramfs script from Ubuntu guide (this doesn't work because it is run before nouveau module is loaded, which is needed for vgaswitcheroo to show up)
- OS X gfxStatus switch to integrated only etc

Any ideas?

Some sources:
http://cberner.com/2012/10/19/instal...ok-pro-retina/
https://help.ubuntu.com/community/HybridGraphics
http://www.hackermusings.com/2012/09...ook-and-linux/


EDIT: note to self (and others :) )
- try http://article.gmane.org/gmane.linux...x86.devel/3794 patch to kernel
- should work then if you force intel from OS X and reboot