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I have an Alienware M14x, as the title sais i have two audio jack but only one works when I plug the earphones. Also mi mic jack doesn’t work either. what can i do to activate them or make Ubuntu aware that they exist

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Try editing the /etc/modprobe.d/alienware-audio-fix.conf file

gksudo gedit /etc/modprobe.d/alienware-audio-fix.conf

and adding the following:

options snd-hda-intel model=dell-eq

It's lets the sound driver know what type of computer you are using (when autodetection fails).

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