Hello,

I don't know if some one already noticed this but is it possible to 
start intel and nvidia card properly with kernel 3.8-rc6.

the way to do so is :

- Disable EFI frame buffer in kernel option,
- switch to intel ouput with gmux, I made the attached durty code based 
on kernel code to do so. It should be the default but if not, you have 
to switch. USE at your own risk
- load nouveau module.
- switch to intel ouput with gmux.
- load i915 module

it make both card loaded properly but there still issue with 
console/frame buffer switch since console are bind to only one video 
output by default, I managed to remap them with fbcon=map:01 that cause 
half console are on intel and other half are on nvidia output.

but this allow to boot with intel video card or nvidia video card (via 
boot script) without the help of MacOS X.

I tested several thinks based on this the following working:

- switch to nvidia output (apple-gmux 1)
- load nouveau
- switch to intel output (apple-gmux 0)
- load i915
- echo OFF > /sys/kernel/debug/vgaswitcheroo/switch

this allow to turn of nvidia (i guess) and run intel a main video output.

I currently use the following:

- switch to intel output
- load i915
- switch to nvidia output
- load nvidia (proprietary driver)
- startx

X start properly with nvidia proprietary driver, with side effect to not 
disable gmux. vt are show by intel output, and X are show with nvidia 
output, consequently vt switch is not trivial but posible (I use actkbd 
to do so)

All this test was done by ssh because most of time I do not have video 
output working.

I don't know who care about that, or who already know that, but if this 
can help, please send this information to people that need them.

Best regards.