@sami, Thanks for your comment.

I believe if you do this:

echo 0x16 0x99130111 > /sys/class/sound/hwC0D0/user_pin_configs
echo 0x1e 0x99130112 > /sys/class/sound/hwC0D0/user_pin_configs

...and then reconfig etc, you wouldn't have to do the asus-mode4 tweak
as well. The thing is that the kernel driver isn't handling 2.1 very
well (I just asked: http://mailman.alsa-project.org/pipermail/alsa-
devel/2012-August/054185.html ), so we're "faking" a rear output on pin
0x16 in the above example, and then the third output becomes C/LFE.

Is the above working for you as well?

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https://bugs.launchpad.net/bugs/871808

Title:
  Asus N55SF/N75SF - External subwoofer not working

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