Audio on Laptop HP dv7-6c80us not working

Problem:

HP-PAVILION-DV7:~$ aplay -l
aplay: device_list:268: no soundcards found...
HP-PAVILION-DV7:~$ 

HP-PAVILION-DV7:~$ lsmod | grep snd

snd_hda_codec_hdmi     41154  0 

snd_hda_codec_idt      50341  1 

snd_hda_intel          52267  0 

snd_hda_codec         188738  3 snd_hda_codec_hdmi,snd_hda_codec_idt,snd_hda_intel

snd_hwdep              13602  1 snd_hda_codec

snd_pcm               102033  3 snd_hda_codec_hdmi,snd_hda_codec,snd_hda_intel

snd_page_alloc         18710  2 snd_pcm,snd_hda_intel

snd_seq_midi           13324  0 

snd_seq_midi_event     14899  1 snd_seq_midi

snd_rawmidi            30095  1 snd_seq_midi

snd_seq                61560  2 snd_seq_midi_event,snd_seq_midi

snd_seq_device         14497  3 snd_seq,snd_rawmidi,snd_seq_midi

snd_timer              29433  2 snd_pcm,snd_seq

snd                    69141  11 snd_hwdep,snd_timer,snd_hda_codec_hdmi,snd_hda_codec_idt,snd_pcm,snd_seq,snd_rawmidi,snd_hda_codec,snd_hda_intel,snd_seq_device,snd_seq_midi

soundcore              12680  1 snd

HP-PAVILION-DV7:~$ cat /proc/asound/pcm 
00-00: 92HD81B1X5 Analog : 92HD81B1X5 Analog : playback 1 : capture 1

HP-PAVILION-DV7:~$  lspci -v
...
...
00:1b.0 Audio device: Intel Corporation 6 Series/C200 Series Chipset Family High Definition Audio Controller (rev 05)
Subsystem: Hewlett-Packard Company Device 165b
Flags: bus master, fast devsel, latency 0, IRQ 54
Memory at c6500000 (64-bit, non-prefetchable) [size=16K]
Capabilities: [50] Power Management version 2
Capabilities: [60] MSI: Enable+ Count=1/1 Maskable- 64bit+
Capabilities: [70] Express Root Complex Integrated Endpoint, MSI 00
Capabilities: [100] Virtual Channel
Capabilities: [130] Root Complex Link
Kernel driver in use: snd_hda_intel