Hi Pierre,
Both patches seems to work (tested 1x on 3.17.rc6). 

Xorg-x11 starts with fluxbox, messages show that 9600 is unacclerated and 9400
is acclerated. There is are two errors in your patch "option for disabling
accleration for given chipset":
* The entries DRM_DEBUG_DRIVER are not available on 3.17.rc6, but it works
either way.
* In the kernel < 3.17 it should be "if (nouveau_noaccel ||
!nouveau_fifo(device) /*XXX*/)" not only "if (nouveau_noaccel)"

Terminating xorg-x11 crashed, probably because I switched off discrete
graphichs adapter after starting xorg. Someone else should check.

Further testing is in queue.

The previous patch you have sent: It solved a problem I had in the past: System
kernel panics if the lid is closed during startup!

Thanks.

Do you think that acceleration for 9600M will be possible sometime?

BR.

(In reply to comment #36)
> This is the minimalistic version of the previous patch.