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I've just got the Asus N76VZ DH71 with a Sonicmaster subwoofer. I got the output on the sonicmaster, but essential its a right channel, not the sub.

I was following:

to try to fix the Intel Audio bug, but after reboot, Ubuntu does not see any audio device at all.

I had to remove the new 2.1 mapping in extra-hdmi.conf in order to have it work again. The Intel Card here is

00:1b.0 Audio device: Intel Corporation Panther Point High Definition Audio Controller (rev 04)
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try this it helped me to have some level of controle on the sub but its still in the right chanell

All needed is to pass a parameter to snd-hda-intel module. Open the file /etc/modprobe.d/alsa-base.conf (you need to create this file if there is no file with that name) and add this line at the ending of the file:

options snd-hda-intel model=asus-mode4

there is the url where i found it http://th0th.me/log/enabling-subwoofer-of-asus-notebook-on-gnulinux/

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Thanks for your answer. AU asks contributors to “Always quote the most relevant part of an important link, in case the target site is unreachable or goes permanently offline.” –  David Foerster Oct 6 at 11:52

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