I'm not entirely sure why the system segfaults without debug=detect.  Also, it appears that you are losing the drivers with a model parameter, as seen by the dmesg output when debug=detect.  Since your system isn't specifically listed, you should see something similar to this:

ALSA alsa-driver-1.0.14rc1/pci/hda/../../alsa-kernel/pci/hda/hda_intel.c:696: codec_mask = 0x3
hda_codec: Unknown model for ALC880, trying auto-probe from BIOS...
ALSA alsa-driver-1.0.14rc1/pci/hda/hda_codec.c:2175: autoconfig: line_outs=1 (0x15/0x0/0x0/0x0/0x0)
ALSA alsa-driver-1.0.14rc1/pci/hda/hda_codec.c:2179:    speaker_outs=0 (0x0/0x0/0x0/0x0/0x0)
ALSA alsa-driver-1.0.14rc1/pci/hda/hda_codec.c:2183:    hp_outs=1 (0x14/0x0/0x0/0x0/0x0)
ALSA alsa-driver-1.0.14rc1/pci/hda/hda_codec.c:2191:    inputs: mic=0x19, fmic=0x0, line=0x0, fline=0x0, cd=0x0, aux=0x0

Check to see that /etc/modprobe.conf (or similar file) isn't setting options for the driver at load time.  You could also override it by manually installing the driver with:
modprobe snd-hda-intel model=auto
That will force the driver into auto mode.

I do notice that there are a couple of systems with similar subdevice ID's.  You could try "model=clevo" as a load option and see what happens.  If this doesn't work, try other models listed in alsa-driver-1.0.14rc1/alsa-kernel/Documentation/ALSA-Configuration.txt (look for ALC880).

If one of these models works well, rebuild the driver without debug=detect and reload with the same parameters.

Let us know one way or the other.  If it works, we can add your system to the driver source relatively easily (1 line).  Otherwise we'll have to work with you to get a more detailed patch working.

Tobin

On Sat, 2007-01-06 at 01:27 +0100, Eric wrote: 
Thank you for your answer.

So I did the following, I hope there are enough infos to understand
what's the problem(s).

System Ubuntu Edgy with 2.6.17 ubuntu kernel on a laptop P4 system.

1) I compiled and installed alsa-driver-1.0.14rc1 with debug=none.
--> Results of dmesg are in Sager-dmesg-debugnone.txt. 
--> Results of lspci -s 0:1b -vn are in Sager-9860-lspci-debugdetect
--> Results of cat /proc/asound/card0/codec* hangs the terminal and I
have to kill it. There are 2 "codec#" files (see
Sager-9860-ls-l-debugnone.txt)
--> Results of aplay file.wav gives : 
ALSA lib pcm_dmix.c:862:(snd_pcm_dmix_open) unable to open slave
aplay: main:547: Erreur d'ouverture audio: Argument invalide

2) I compiled and installed alsa-driver-1.0.14rc1 with debug=detect :
--> Results of dmesg are in Sager-dmesg-debugdetect.txt
--> Results of lspci -s 0:1b -vn are in Sager-9860-lspci-debugdetect.txt
--> Results of cat /proc/asound/card0/codec* are in
Sager-9860-codec-debugdetect.txt . There is only one code# file (see
Sager-9860-ls-l-debugdetect.txt), contrary to the previous test.
--> Results of aplay is ok. Playing sound works ... 

Eric

Le jeudi 04 janvier 2007 à 07:12 -0800, Tobin Davis a écrit :
> To start, what version of alsa are you running
> (cat /proc/asound/version)?  You should download at least
> alsa-driver-1.0.14rc1.tar.bz2 from the alsa-project.org site.  For
> debugging and configuring your system, it is recommended that you
> build with "./configure --with-debug=detect --with-cards=hda-intel".
> 
> Clear the dmesg log with "dmesg -c" prior to loading the driver.
> After loading, the driver will output some basic information that we
> need for development.  Also send "cat /proc/asound/card0/codec*
> >Sager9860-codec.txt", and "lspci -s 0:1b -vn" output.
> 
> These three things will help us to get your system added quickly.
> 
> Thanks,
> 
> Tobin
> 
> On Thu, 2007-01-04 at 14:52 +0000, Eric De Vito wrote: 
> > I have a laptop (pentiumIV, Sager9860/D900t model) with an ALC880 Realtek
> > integrated sound card. I have problems and bugs with any alsa versions,
> > with an Ubuntu Edgy system. What must I provide as informations that may
> > be useful for tracking bugs ?
> > Thank you
> > 
> > Eric
> > 
> > -------------------------------------------------------------------------
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> -- 
> Tobin Davis <tdavis@dsl-only.net>
--
Tobin Davis <tdavis@dsl-only.net>