I too have a optimus laptop with GM107 / intel graphics card, and I have not
been able to use nouveau driver since I bought the laptop (using kernels 4.3.5
up to 4.8.10 on Fedora 23-25 x64).

I have searched for multiple solutions so far, and always finished by
blacklisting nouveau in order to be able to use that laptop.
I could not even able to launch lspci without rendering my system unresponsive
(process then takes 100% cpu and I get cpu softlocks)

I've tried nouveau.runpm=0 and well, I can at least boot without having nouveau
totally disabled :)

When not using runpm=0, I get the following when launching lspci / or
DRI_PRIME=1 glxgears

[ 1470.121123] nouveau 0000:01:00.0: Refused to change power state, currently
in D3
[ 1470.193738] nouveau 0000:01:00.0: Refused to change power state, currently
in D3
[ 1470.205762] nouveau 0000:01:00.0: Refused to change power state, currently
in D3
[ 1470.205766] nouveau 0000:01:00.0: DRM: resuming kernel object tree...
[ 1470.205792] nouveau 0000:01:00.0: pci: failed to adjust cap speed
[ 1470.205793] nouveau 0000:01:00.0: pci: failed to adjust lnkctl speed

So I guess the nouveau driver cannot send to sleep / wake my nvidia card for
whatever reason.

I am actually trying rely on the discrete graphics in order to reduce power
consumption by default.

I noticed that I can't use vgaswitcheroo in order to chose my primary graphic
card. Also noticed the following error messages on boot.
[    1.795356] [drm] Initialized drm 1.1.0 20060810
[    1.881362] ACPI Warning: \_SB.PCI0.GFX0._DSM: Argument #4 type mismatch -
Found [Buffer], ACPI requires [Package] (20160422/nsarguments-95)
[    1.881428] ACPI Warning: \_SB.PCI0.PEG0.PEGP._DSM: Argument #4 type
mismatch - Found [Buffer], ACPI requires [Package] (20160422/nsarguments-95)
[    1.881552] ACPI Warning: \_SB.PCI0.PEG0.PEGP._DSM: Argument #4 type
mismatch - Found [Buffer], ACPI requires [Package] (20160422/nsarguments-95)
[    1.881753] VGA switcheroo: detected Optimus DSM method \_SB_.PCI0.PEG0.PEGP
handle
[    1.881753] nouveau: detected PR support, will not use DSM

So far, when I switch graphic cards, I get the following in dmesg:

[ 1174.921195] nouveau 0000:01:00.0: DRM: resuming kernel object tree...
[ 1174.921209] nouveau 0000:01:00.0: DRM: resuming client object trees...
[ 1174.921226] nouveau 0000:01:00.0: fifo: BIND_ERROR 01 [BIND_NOT_UNBOUND]
[ 1317.637168] vga_switcheroo: client 0 refused switch

I guess that nouveau driver does not allow to disable the nvidia card when
runpm=0 is passed as argument ?

Anything I could try please ?