Headphone is working fine but laptop sound is not working.
Using card 1: PCH [HDA Intel PCH], device 0: HDA Generic [HDA Generic] on ubuntu 12.04. More Infos:-
Card: HDA Intel PCH Chip Realtek ID 255 Advanced Linux Sound Architecture Driver Version 1.0.25
I ran 'alsamixer' in a terminal and made 'Line' column full.
Added these lines in nano /etc/modprobe.d/alsa-base.conf file and rebooted the system.
options snd-hda-intel model=auto & options snd-hda-intel model=pch position_fix=1