Sound from headphones only.

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Hi,

I have a HP dc7700 which uses an intel hda soundcard(ICH8). I managed to
get sound to work by upgrading to a 2.6.19 kernel with alsa 1.0.14rc1,
but I get sound only from the headphones output on the front of the
comp.
The comp has three jacks on the back : in, out and mic, and two on the
front : headphones and mic.

here's lspci's output : 
00:1b.0 Audio device: Intel Corporation 82801H (ICH8 Family) HD Audio
Controller (rev 02)

loaded modules : 
snd_hda_intel          21784  3
snd_hda_codec         188544  1 snd_hda_intel
snd_pcm_oss            42912  0
snd_mixer_oss          17280  1 snd_pcm_oss
snd_pcm                76548  4 snd_hda_intel,snd_hda_codec,snd_pcm_oss
snd_timer              23300  2 snd_pcm
snd                    53092  10
snd_hda_intel,snd_hda_codec,snd_pcm_oss,snd_mixer_oss,snd_pcm,snd_timer
soundcore               8928  1 snd
snd_page_alloc         11016  2 snd_hda_intel,snd_pcm

I've also tried loading the snd_hda_intel module with various model=
options without success.
I also tried to unplug the cable providing audio output to the front
panel.
Tried various mixer settings unsucessfully.

Thanks in advance.



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