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Here is the model of my laptop:

As the specs say, it has quad speakers with a sub-woofer... When i was using windows 8, i had no problems. But, now only two speakers work and no sub-woofer.

I recently switched over to ubuntu and i'm a newbie :).. Please post a step-by-step guide for installing audio driver.

I heard that alsa is pre installed in ubuntu 13.04

Thanks for your replies :)

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You do not need installation but configuration. Please show the output of the alsa-info script. – CL. May 25 '13 at 7:25
Does speaker-test -D hw:0,0 -t wav -c 6 work? – CL. May 25 '13 at 19:52
speaker-test 1.0.25 Playback device is hw:0,0 Stream parameters are 48000Hz, S16_LE, 6 channels WAV file(s) Channels count (6) not available for playbacks: Invalid argument Setting of hwparams failed: Invalid argument This is the output i got! – dinesh2707 May 26 '13 at 5:08
Does it work with -c 4 instead? – CL. May 26 '13 at 8:39
up vote 0 down vote accepted

NO problem @CL. Got it working... Did the following:

First, edit the following file:

sudo gedit /etc/pulse/daemon.conf

Uncommment and change the values of these lines:

enable-lfe-remixing = yes
default-sample-channels = 4
default-channel-map = front-left,front-right,center,lfe

Second, edit the following file:

sudo gedit /etc/pulse/

Add the following line to the end:

load-module module-combine channels=4 channel_map=front-left,front-right,center,lfe
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