No meu sistema, eu fiz a seguinte dica:

***************
pegue os pacotes no site do alsa http://www.alsa-project.org/

- alsa-driver 
ftp://ftp.alsa-project.org/pub/driver/alsa-driver-1.0.14rc3.tar.bz2
- alsa-lib ftp://ftp.alsa-project.org/pub/lib/alsa-lib-1.0.14rc3.tar.bz2
- alsa-utils ftp://ftp.alsa-project.org/pub/utils/alsa-utils-1.0.14rc2.tar.bz2

Compile o alsa-driver assim:

./configure --with-card-options=all
make
make install

Compile o alsa-lib e alsa-utils assim:
./configure
make
make install

***************

AĆ­ funcionou, sem recompilar o kernel. Mas funciona sem o recurso de 5.1, quem 
tiver informacoes por favor poste!

Debian etch/AMD64 placa Asus M2N-MX SE

PS: As versoes do site ja sao mais atuais.

>       Lista
>
>       Estou tentando recompiar o kernel e estou tendo problemas com a parte 
> de som.
>
> - GNU/Debian - testing
> - Kernel - 2.6.23
> - Motherboard - ASUS P5LD2-X
> - Chipset Type - Intel 945P Express / Intel ICH7
> - Audio
>       Audio Output: Sound card
>       Audio Codec: Realtek ALC662
>       Sound Output Mode: 5.1 channel surround
>       Compliant Standards: High Definition Audio
>
> - kenrel
>       Foi selecionado todas as opcoes referentes a som.
>
> - lsmod do kernel padrao debian testing
>       snd_hda_intel         239160  4
>       snd_pcm_oss            39200  0
>       snd_pcm                72324  3 snd_hda_intel,snd_pcm_oss
>       snd_mixer_oss          15424  1 snd_pcm_oss
>       snd_seq_dummy           3748  0
>       snd_seq_oss            29408  0
>       snd_seq_midi            8160  0
>       snd_rawmidi            22624  1 snd_seq_midi
>       snd_seq_midi_event      6880  2 snd_seq_oss,snd_seq_midi
>       snd_seq                46320  6
>       snd_seq_dummy,snd_seq_oss,snd_seq_midi,snd_seq_midi_event
>       snd_timer              21028  3 snd_pcm,snd_seq
>       snd_seq_device          7692  5
>       snd_seq_dummy,snd_seq_oss,snd_seq_midi,snd_rawmidi,snd_seq
>       snd                    48324  15
>       snd_hda_intel,snd_pcm_oss,snd_pcm,snd_mixer_oss,snd_seq_oss,snd_rawmidi,
>               snd_seq,snd_timer,snd_seq_device
>       soundcore               7520  1 snd
>       serio_raw               6692  0
>       snd_page_alloc          9512  2 snd_hda_intel,snd_pcm
>
> - dmesg - kernel original
>       hda_codec: Unknown model for ALC662, trying auto-probe from BIOS...
>
> - dmesg - tentativa de novo kernel
>       ALSA sound/pci/hda/hda_intel.c:695: codec_mask = 0x1
>       hda_codec: Unknown model for ALC662, trying auto-probe from BIOS...
>       ALSA sound/pci/hda/hda_codec.c:2331: autoconfig: line_outs=1
>               (0x14/0x0/0x0/0x0/0x0)
>       ALSA sound/pci/hda/hda_codec.c:2335:    speaker_outs=0
>               (0x0/0x0/0x0/0x0/0x0)
>       ALSA sound/pci/hda/hda_codec.c:2339:    hp_outs=1 (0x1b/0x0/0x0/0x0/0x0)
>       ALSA sound/pci/hda/hda_codec.c:2347:    inputs: mic=0x18, fmic=0x19,
>               line=0x1a, fline=0x0, cd=0x0, aux=0x0
>       PM: Adding info for No Bus:pcmC0D1p
>       PM: Adding info for No Bus:adsp
>       PM: Adding info for No Bus:pcmC0D0p
>       PM: Adding info for No Bus:pcmC0D0c
>       PM: Adding info for No Bus:dsp
>       PM: Adding info for No Bus:audio
>       PM: Adding info for No Bus:controlC0
>       PM: Adding info for No Bus:mixer
>       hda_codec: num_steps = 0 for NID=0xc
>       PM: Adding info for No Bus:vcs2
>       PM: Adding info for No Bus:vcsa2
>       PM: Removing info for No Bus:vcs2
>       PM: Removing info for No Bus:vcsa2
>       hda_codec: num_steps = 0 for NID=0xc
>
>       Alguem por acaso teria alguma ideia do que pode esta faltando no kernel 
> para
> que o som possa funcionar?
>
>
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