I seem to have the same/very similar problem. I am using edgy's kernel
version 2.6.17-10 with alsa 1.0.12rc1. The hardware is a very new MacPro
(new enough so hal-device-manager shows tons of "unkown" strings).
--snip --
00:1b.0 Audio device: Intel Corporation Enterprise Southbridge High Definition
Audio (rev 09)
Flags: bus master, fast devsel, latency 0, IRQ 225
Memory at 52f00000 (64-bit, non-prefetchable) [size=16K]
Capabilities: [50] Power Management version 2
Capabilities: [60] Message Signalled Interrupts: 64bit+ Queue=0/0 Enable-
Capabilities: [70] Express Unknown type IRQ 0
----
gicmo at photon /proc/asound % cat cards
0 [Intel ]: HDA-Intel - HDA Intel
HDA Intel at 0x52f00000 irq 225
---
gicmo at photon /proc/asound/Intel % cat codec\#0
Codec: Realtek ALC885
Address: 0
Vendor Id: 0x10ec0885
Subsystem Id: 0x106b0c00
Revision Id: 0x100103
Default PCM: rates 0x560, bits 0x0e, types 0x1
Default Amp-In caps: N/A
Default Amp-Out caps: N/A
[... (lots of output omitted, if you need it please ask) ..]
---
snd_hda_intel 20116 2
snd_hda_codec 164608 1 snd_hda_intel
snd_pcm_oss 47360 0
snd_mixer_oss 19584 1 snd_pcm_oss
snd_pcm 84612 3 snd_hda_intel,snd_hda_codec,snd_pcm_oss
snd_timer 25348 1 snd_pcm
snd 58372 9 snd_hda_intel,snd_hda_codec,snd_pcm_oss,snd_mixer_oss,snd_pcm,snd_timer
soundcore 11232 1 snd
snd_page_alloc 11400 2 snd_hda_intel,snd_pcm
------
I of course checked mixer settings (unmute and stuff) and I also played a bit around with the model=XXX module parameter, but no luck.
--
no sound Intel HDA (ICH6) and ALC260 (or ALC880) mixer; no errors
https://launchpad.net/bugs/28443