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[Russ Brown <russell.t.brown@xxxxxxxxx>]

I was having the same problems and the information here definitely
improved things - so maybe it'll help things along here too:

https://bugtrack.alsa-project.org/alsa-bug/view.php?id=4086

** Bug watch added: ALSA Bug Tracker #4086
   https://bugtrack.alsa-project.org/alsa-bug/view.php?id=4086

-- 
Headphones don't work for aluminum iMac
https://bugs.launchpad.net/bugs/360866
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Support, which is the registrant for Mactel Support.

Status in Mactel Support: New

Bug description:
Hello!
    For the most part, the Jaunty beta is working very nicely on my intel iMac.   This aluminum 20" imac reports 7,1 using dmidecode.  Under 8.04 and 8.1 as well, I have been able to hear lower quality sounds through the built-in speakers using either of these additions to alsa-base.conf:

options snd-hda-intel model=mbp3
or
options snd-hda-intel model=imac24.

Unfortunately, the sound quality seems impaired, and I haven't been able to get the headphones to work at all.  Using the default alsa-base.conf gives very low amplitude headphone output that requires a lot of amplification to hear; no internal speaker output is heard with the default.

    Here's the output from aplay -l:

**** List of PLAYBACK Hardware Devices ****
card 0: Intel [HDA Intel], device 0: ALC885 Analog [ALC885 Analog]
  Subdevices: 0/1
  Subdevice #0: subdevice #0
card 0: Intel [HDA Intel], device 1: ALC885 Digital [ALC885 Digital]
  Subdevices: 1/1
  Subdevice #0: subdevice #0

    cat /proc/asound/cards:

 0 [Intel          ]: HDA-Intel - HDA Intel
                      HDA Intel at 0x90700000 irq 20

I have also attached the output from dmidecode.

Please let me know if I can furnish any other information or assist in the resolution of this sound problem.

Aloha,
-Jeff Mings