Sound card support

modulename: soundcore.ko

configname: CONFIG_SOUND

Linux Kernel Configuration
└─>Device Drivers
└─>Sound card support
In linux kernel since version 2.6.12  
If you have a sound card in your computer, i.e. if it can say more
than an occasional beep, say Y.

source code:

is selected by
CONFIG_SND_PXA2XX_AC97