Sound on Dell XPS L702X in Linux

After getting the sound working on the laptop, I was still running into issues with distorted sound and the sub woofer not working. The sound chipset that is in it is Intel, as can be seen by:

00:1b.0 Audio device: Intel Corporation 6 Series/C200 Series Chipset Family High Definition Audio Controller (rev 05)

The fix was by adding some additional commands to the snd-hda-intel module:

echo "options snd-hda-intel model=ref index=0" >> /etc/modprobe.d/sound.conf
echo "options snd-hda-intel model=6stack-full" >> /etc/modprobe.d/sound.conf

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