CONFIG_DRM_KMS_HELPER (not configurable)

modulename: drm_kms_helper.ko

configname: CONFIG_DRM_KMS_HELPER

Linux Kernel Configuration
└─>Device Drivers
└─>Graphics support
└─>Direct Rendering Manager
└─>Direct Rendering Manager (XFree86 4.1.0 and higher DRI support)
└─>DRM_KMS_HELPER
In linux kernel since version 2.6.32 (release Date: 2009-12-02)  
CRTC helpers for KMS drivers.

source code:
drivers/gpu/drm//