layout-id fabric

modulename: snd-aoa-fabric-layout.ko

configname: CONFIG_SND_AOA_FABRIC_LAYOUT

Linux Kernel Configuration
└─>Device Drivers
└─>Sound
└─>Advanced Linux Sound Architecture
└─>Apple Onboard Audio driver
└─>layout-id fabric
In linux kernel since version 2.6.20 (release Date: 2007-02-04)  
This enables the layout-id fabric for the Apple Onboard
Audio driver, the module holding it all together
based on the device-tree's layout-id property.

If you are unsure and have a later Apple machine,
compile it as a module.

source code:
sound/aoa/fabrics/snd-aoa-fabric-layout.c