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External audio set detection issues on Alienware M17x R4

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https://bbs.archlinux.org – I have a M17xR4 too and the same problem with kernel 3.9 (I tested the 3.9.3, and the problem is still here).First, I discovered that the headphones were muted in alsa, as Johni said. I unmuted them with alsa mixer and then they worked again. But now I'm facing another problem : the sound plays by both the headphones and my HDMI screen (which have speakers).I don't know which one of pulseaudio or alsa mixed up the two, and lack time to make tests this week. I will dig in it this week-end, and try the snd-hda-intel option you're suggesting.If anyone find a solution before, I will (HowTos)