No sound on a Thinkpad T61 w/ ALSA and AS1984 sound card (redux)

["Kyle Barbour" <kylebarbour@gmail.com>]

Hello everyone,

A while back (http://lists.debian.org/debian-user/2008/01/msg02415.html),
I was having trouble getting sound  to work on my Thinkpad T61.
Although that was resolved and everything worked wonderfully, a few
days ago sound stopped working again, and I haven't been successful at
fixing the problem. Neither the internal speakers nor the headphones
produce any sound. The master volume and the PCM volume are on full,
neither are muted, and both the speaker and headphones are enabled.

My sound card is an Analog Devices 1984 (AD1984) sound card, and I'm
running Debian Lenny (2.6.26-1-686 kernel) with ALSA 1.0.16. According
to thinkwiki (http://www.thinkwiki.org/wiki/AD1984), this card should
be supported in the kernel and in the alsa driver in the versions I'm
using.

lsmod | grep snd_hda_intel returns:

snd_hdsnd_hda_intel         324248  2
snd_pcm                62596  2 snd_pcm_oss,snd_hda_intel
snd                    45604  12
snd_pcm_oss,snd_mixer_oss,snd_hda_intel,snd_pcm,snd_seq_oss,snd_seq,snd_timer,snd_seq_device
snd_page_alloc          7816  2 snd_hda_intel,snd_pcm
a_intel         324248  2
snd_pcm                62596  2 snd_pcm_oss,snd_hda_intel
snd                    45604  12
snd_pcm_oss,snd_mixer_oss,snd_hda_intel,snd_pcm,snd_seq_oss,snd_seq,snd_timer,snd_seq_device
snd_page_alloc          7816  2 snd_hda_intel,snd_pcm

so it looks as though the correct module is loaded.

I tried reconfiguring the sound card with alsaconf, which didn't fix
the problem, although it reported a successful status. Compiling ALSA
from alsa-source (using module-assistant) and manually loading the
modules didn't fix anything either (so maybe not an ALSA problem?).

Some more information:

$ cat /proc/asound/cards
0 [Intel          ]: HDA-Intel - HDA Intel
                     HDA Intel at 0xfe020000 irq 17
$ cat /proc/asound/version
Advanced Linux Sound Architecture Driver Version 1.0.16.
$ cat /dev/sndstat
Sound Driver:3.8.1a-980706 (ALSA v1.0.16 emulation code)
Kernel: Linux finnegan 2.6.26-1-686 #1 SMP Mon Dec 15 18:15:07 UTC 2008 i686
Config options: 0

Installed drivers:
Type 10: ALSA emulation

Card config:
HDA Intel at 0xfe020000 irq 17

Audio devices:
0: AD198x Analog (DUPLEX)

Synth devices: NOT ENABLED IN CONFIG

Midi devices: NOT ENABLED IN CONFIG

Timers:
7: system timer

Mixers:
0: Analog Devices AD1984

Any thoughts on what might be causing the problem?

Thanks!

Kyle Barbour