Nouveau (NVIDIA) cards

modulename: nouveau.ko

configname: CONFIG_DRM_NOUVEAU

Linux Kernel Configuration
└─>Device Drivers
└─>Graphics support
└─>Direct Rendering Manager (XFree86 4.1.0 and higher DRI support)
└─>Nouveau (NVIDIA) cards
In linux kernel since version 2.6.33 (release Date: 2010-02-24)  
Choose this option for open-source NVIDIA support.

source code:
drivers/gpu/drm/nouveau/Kbuild