Debian 5 sem som

Olá, já consultei vários posts, mas não resolvi meu problema de som (todo o sistema tá sem som).
Meu sistema:
Debian Lenny, Kernel 2.6.29-2-amd64
KDE 3.5.10
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Alguns comandos:

lspci -vv | grep Audio
00:08.0 Audio device: nVidia Corporation Device 0ac0 (rev b1)

cat /proc/interrupts
8:          1          0   IO-APIC-edge      rtc0

lsmod | grep snd
snd_hda_codec_nvhdmi     3392 1
snd_hda_codec_idt      61280 1
snd_hda_intel          26488 0
snd_hda_codec          69664 3 snd_hda_codec_nvhdmi,snd_hda_codec_idt,snd_hda_intel
snd_hwdep               7864 1 snd_hda_codec
snd_pcm_oss            36448 0
snd_mixer_oss          14576 1 snd_pcm_oss
snd_pcm                78776 3 snd_hda_intel,snd_hda_codec,snd_pcm_oss
snd_seq_dummy           3108 0
snd_seq_oss            29184 0
snd_seq_midi            6672 0
snd_rawmidi            22896 1 snd_seq_midi
snd_seq_midi_event      7504 2 snd_seq_oss,snd_seq_midi
snd_seq                50800 6 snd_seq_dummy,snd_seq_oss,snd_seq_midi,snd_seq_midi_event
snd_timer              22240 2 snd_pcm,snd_seq
snd_seq_device          7428 5 snd_seq_dummy,snd_seq_oss,snd_seq_midi,snd_rawmidi,snd_seq
snd                    63192 12 snd_hda_codec_idt,snd_hda_intel,snd_hda_codec,snd_hwdep,snd_pcm_oss,snd_mixer_oss,snd_pcm,snd_seq_oss,snd_rawmidi,snd_seq,snd_timer,snd_seq_device
soundcore               7984 1 snd
snd_page_alloc          9776 2 snd_hda_intel,snd_pcm
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O alsa indentifica o chip da placa de som corretamente: nVidia MCP7A HDMI. O alsamix retorna: master 54, headphon 70, PCM 50 e as outras informações todos zerados.

Por favor, alguem me ajude...

___________________

Luciano Marques

Goiânia-GO