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#1 2011-11-18 21:11:29

chthon
Member
Registered: 2010-04-18
Posts: 8

External subwoofer not working on Asus n55sf notebook

The external subwoofer that comes with the notebook -- which has a proprietary audio jack connection -- doesn't seem to work. 

While based on a web search I'm not certain anyone has got the subwoofer working reliably, the following Ubuntu bug thread suggests there is at least one other Arch user who has got the subwoofer working for a while (at least until the upgrade to Kernel 3.1). 
https://bugs.launchpad.net/ubuntu/+sour … bug/871808

Does anyone have any ideas how I can get it working?  I've tried all the possible solutions suggested in the bug.  The hda_analyzer codec tweaks don't work for me. My system is up to date. I'm running Gnome 3, alsa and pulseaudio.

The output of my alsa-info.sh is http://www.alsa-project.org/db/?f=4777d … af41b8d3bb

Perhaps I need to file a bug with the alsa project?

Thanks in advance for any suggestions.

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#2 2011-11-18 22:05:05

lagagnon
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From: an Island in the Pacific...
Registered: 2009-12-10
Posts: 1,087
Website

Re: External subwoofer not working on Asus n55sf notebook

It appears that someone here: https://bugs.launchpad.net/ubuntu/+sour … bug/871808 has found a solution.


Philosophy is looking for a black cat in a dark room. Metaphysics is looking for a black cat in a dark room that isn't there. Religion is looking for a black cat in a dark room that isn't there and shouting "I found it!". Science is looking for a black cat in a dark room with a flashlight.

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#3 2011-11-18 22:10:52

chthon
Member
Registered: 2010-04-18
Posts: 8

Re: External subwoofer not working on Asus n55sf notebook

Thanks for the reply.  The bug thread (at the moment) concludes with:   
"It worked on the 3.0 kernel version. But the most weird is that even if I do the changes you did in the hda_analyser tool to switch on the subwoofer, it doesn't change anything for me ..." [on kernel version 3.1]

I've tried all the suggestions on the page and they don't work for me (I'm using the 3.1 kernel).  I suppose one solution would be to revert back to the 3.0 kernel and stick with that for a while (assuming that I can get that working).

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#4 2011-12-03 22:29:08

chthon
Member
Registered: 2010-04-18
Posts: 8

Re: External subwoofer not working on Asus n55sf notebook

OK, so now running kernel 3.1.4-1-ARCH.

I can now enable the subwoofer using hda_analyzer tool using the instructions in post #7 of the Ubuntu bug report
https://bugs.launchpad.net/ubuntu/+sour … bug/871808

As noted in the the post, the sound from the subwoofer is the same as the right channel and isn't very good.  Setting the suggested user defined pin settings in /etc/rc.local doesn't work still.

At least the hardware actually works.  Now to get the codec issue sorted...

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#5 2011-12-04 16:15:06

chthon
Member
Registered: 2010-04-18
Posts: 8

Re: External subwoofer not working on Asus n55sf notebook

A further update:

My sound chip is a Realtek ALC663.  I've tried to setting the model version in /etc/modprobe.d/alsa.conf using the following statement

options snd-hda-intel model=3stack-6ch-dig

Models are specified for the ALC663 chip at http://www.mjmwired.net/kernel/Document … Models.txt.  I have tried the following models:

3stack-dig     3-stack (2-channel) with SPDIF
3stack-6ch     3-stack (6-channel)
3stack-6ch-dig 3-stack (6-channel) with SPDIF
5stack-dig     5-stack with SPDIF
g50v                ASUS G50V
asus-mode1    ASUS
asus-mode2    ASUS
asus-mode8    ASUS
dell-zm1            Dell ZM1 with ALC272
auto                auto-config reading BIOS (default)

I can get the subwoofer working under some of these configurations but that typically means selecting surround sound and having missing channels (I think the laptop has a left front and a right front channel and the external subwoofer, not a front centre or any rear speakers).  Typically, the subwoofer, when working is linked to the right channel, so it would appear that the right channel is output through the subwoofer and the left channel through the front speakers. 

I think I need to file a bug with ALSA project and hope that support for my laptop can be included in a future release of ALSA.

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#6 2011-12-12 13:19:53

wzzrd
Member
Registered: 2004-01-17
Posts: 3

Re: External subwoofer not working on Asus n55sf notebook

If you get this working again, please post back. I've got the same laptop and I'm curious about this. I don't really need it though, so I'll just hitch along with you if that's ok wink

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