My setup is Gentoo +:
kernel 3.14, Mesa 10.4.0, xserver 1.15, libdrm 2.4.52, nouveau 1.0.10

Normally my machine works using the Intel HD graphics only, but I wanted to
experiment with nvidia/nouveau drivers.
Using the proprietary Nvidia driver, and kernel 3.13, I managed to make a
xorg.conf file that "disabled" the Intel card and only the Nvidia card
primarily for 2D/3D. 
Using the same xorg.conf, and the 3.14 kernel, I replaced the nvidia driver
with nouveau, and I end up with a blank screen and some weird errors in my
dmesg.

Any ideas?