Hello,

On Ubuntu 13.10 (fresh install not upgrade) I observed that subwoofer yielded 
no sound.
So I tested two fixes separately, changes from vanilla configuration are 
indicated with "-->".

1. Post #8: Setting the pin configuration default to 0x99130112 for pin 0x16
--> Subwoofer plays sound, high frequencies included
--> Muting right channel at source mutes subwoofer, muting left channel at 
source does not affect subwoofer
--> alsamixer shows a "bass" volume control that affects subwoofer
--> alsamixer master volume affects all channels as expected
--> interference noise in subwoofer, not very loud but clearly audible when ear 
close to subwoofer

2. Post #34:
edit /etc/modprobe.d/alsa-base.conf and add this line:
options snd-hda-intel model=asus-mode4
--> Same consequences (not tested volume details though)


Interference noise in subwoofer only happens when enabling one of those fixes.
Disappears immediately when doing rmmod snd-hda-intel.

Close attention to this noise, revealed that some noise remains even
after rmmod snd-hda-intel, but it's more subtle because more or less the
same power as the PC fan noise. As expected, unplugging the subwoofer
from the jack removes that noise.


Keeping in mind the usual "hey it's open source, it's done when someone does it 
philosophy, why is this bug/feature not addressed  ?
Because wiring is non-standard ?
Because it's difficult to implement an auto-detect + jack sense feature that 
just works ?
Because no one really cares (IMHO sound is not that good anyway, any decent 
external stereo will do much better, so I consider myself in the "not really 
cares" option) ?

Just my two cents.

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

Title:
  Asus N55SF/N75SF - External subwoofer not working

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