My Machine: Laptop HP 6730b
Platform: Ubuntu 8.10 (using AlSA for sound)
Problem: Sound comes only in headphones,  but not through laptop speakers

I tried to repeat the above steps, but couldnt proceed after  below step

To check the model of the sound card, I run the below cmd in the terminal
>head -n 1 /proc/asound/card0/codec*

Result:
==> /proc/asound/card0/codec#0 <==
Codec: Analog Devices ID 194a

==> /proc/asound/card0/codec#1 <==
Codec: Generic 11c1 ID 1040

Now can you tell me, how to identify the model?

Without knowing the model i tried to edit below files
>/etc/modprobe.d/alsa-base
>/etc/modprobe.d/options

by trying
>options snd-hda-intel model=mobile
>options snd-hda-intel model=laptop

Now how to proceed..
I am really stuck, will be great if somebody provide me a soltion

-- 
No sound from Laptop speakers, but headphones. my solution
https://bugs.launchpad.net/bugs/269027
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