Area-51m R1, 5.1 channel configuration for Realtek audio

Hi All,

I have a query regarding speaker configuration for Realtek audio on Alienware Area-51m R1. I wanted to enable 5.1 channel setup, but it only shows stereo option.

My Dell XPS 15 shows both 5.1 channel setup as well as 7.1 channel setup for Realtek audio. 

Am I missing something here? I know the card versions are different and the models are different, but should it not be providing more options in newer generation laptop? I have the latest version of drivers from Dell updates in both systems.

Thanks