[ubuntu] Dell xps 15 l502x headphone jack won't work

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http://ubuntuforums.org – I can't seem to get my headphone jack on my xps to work properly. I have two jacks; a normal headphone jack and one labeled S/P DIF. The one with the label works, but i can't control the volume on it. I've been trying to add different options to /etc/modprobe.d/alsa.conf, but nothing has worked yet. (Hardware)