Can't hear sound from headphones (Intel HDA / ALC880)

[THROBiX]

Hi!

I'm using Ubuntu Dapper Drake (2.6.15-25 kernel) on my Quanta MW1 laptop.
My soundcard is Intel High Definition Audio, with Realtek ALC880-chipset.

My problem is that I only get sound through the internal speakers, not from the headphones. Even if I plug-in headphones in the jack, I still hear sound from the internal speakers.

I'm using Alsa 1.0.12rc1, compiled from source.

Here's the "lsmod | grep snd"-output:

snd_hda_intel          19476  1
snd_hda_codec         146736  1 snd_hda_intel
snd_pcm                81672  2 snd_hda_intel,snd_hda_codec
snd_timer              25220  1 snd_pcm
snd                    56292  6 snd_hda_intel,snd_hda_codec,snd_pcm,snd_timer
soundcore              10208  1 snd
snd_page_alloc         10760  2 snd_hda_intel,snd_pcm

And here's the "cat /proc/asound/cards"-output:

 0 [Intel          ]: HDA-Intel - HDA Intel
                      HDA Intel at 0xc0000000 irq 169

And here's the "lspci"-output:

0000:00:1b.0 0403: Intel Corporation 82801FB/FBM/FR/FW/FRW (ICH6 Family) High Definition Audio Controller (rev 04)

Contents of "/etc/modprobe.d/alsa-base":

# autoloader aliases
install sound-slot-0 modprobe snd-card-0
install sound-slot-1 modprobe snd-card-1
install sound-slot-2 modprobe snd-card-2
install sound-slot-3 modprobe snd-card-3
install sound-slot-4 modprobe snd-card-4
install sound-slot-5 modprobe snd-card-5
install sound-slot-6 modprobe snd-card-6
install sound-slot-7 modprobe snd-card-7

alias snd-card-0 snd-hda-intel
alias sound-slot-0 snd-hda-intel
alias char-major-116 snd

options snd major=116 cards_limit=1

options snd-hda-intel model=laptop-eapd

Here's the content of "/etc/modutils/alsa-base":

alias char-major-116 snd

options snd major=116 cards_limit=1

alias snd-card-0 snd-hda-intel

options snd-hda-intel model=laptop-eapd

I've tried using auto, z71v, laptop, and 3stack as "model", with no luck. I've even unmuted all the volumebars in alsamixer.
I've searched this forum too, and found others with same problem, just with another laptop (I think).. I have tried the solutions from the others, with no luck neither.

I would be very happy if someone have a solution, because I'm using headphones all the day (doesn't like to use external speakers).