Enable input device for es1968 volume buttons

configname: CONFIG_SND_ES1968_INPUT

Linux Kernel Configuration
└─>Device Drivers
└─>Sound card support
└─>Advanced Linux Sound Architecture
└─>PCI sound devices
└─>Enable input device for es1968 volume buttons
In linux kernel since version 2.6.35 (release Date: 2010-08-01)  
If you say Y here, you will get an input device which reports
keypresses for the volume buttons connected to the es1968 chip.
If you say N the buttons will directly control the master volume.
It is recommended to say Y.