problem with getting 2.1 speaker working under 12.04/unity/pulseaudio

Question

I have been using askubuntu extensively and now I am going to ask my first question here.

I am trying to get my 2.1 speaker working on my ThinkPad X60 and a 12.04LTS/unity/pulseaudio (00:1b.0 Audio device: Intel Corporation N10/ICH 7 Family High Definition Audio Controller (rev 02)).

The front left/right is working fine, but I cannot get the lfe/subwoofer working.

Here is a subset of my pulseaudio conf:

enable-lfe-remixing = yes
...
default-sample-channels = 3
default-channel-map = front-left,front-right,lfe

I also notice the server sample tab in paman shows :

Default Sample Type: s16le 3ch 44100Hz

However in the device tab, the property of the sink is always s16le 2ch 44100Hz.

I also tried modify default.pa (load-module module-remap-sink OR module-alsa-sink) but it either doesn't work or switch to digital output which have no output at all.

Any idea will be very appreciated as this is something I have spent a whole morning to try to figure out...

Answer 1

Try the follwing steps:

1.

echo 'options snd-hda-intel model=asus-mode4' | sudo tee -a /etc/modprobe.d/alsa-base.conf

2.

sudo gedit /usr/share/pulseaudio/alsa-mixer/profile-sets/extra-hdmi.conf

and add following lines to extra-hdmi.conf

[Mapping analog-surround-21]
device-strings = surround40:%f
channel-map = front-left,front-right,lfe,lfe 
paths-output = analog-output analog-output-speaker 
priority = 7 
direction = out

3.

sudo gedit /etc/pulse/daemon.conf

and add following line to daemon.conf

enable-lfe-remixing = yes