Here is the model of my laptop: http://www.gadgetsguru.com/hp-dv6-7040tx-lowest-price-spec-cheap-sale-india-15613.aspx
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 :)