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Gmane
From: Fernando Lopez-Lezcano <nando <at> ccrma.Stanford.EDU>
Subject: Re: F8 on iMac won't boot
Newsgroups: gmane.comp.audio.planetccrma.general
Date: Friday 11th April 2008 16:16:10 UTC (over 9 years ago)
On Tue, 2008-04-08 at 00:05 +0100, Michael Gurevich wrote:
> Thanks Nando,
> 
> acpi=off did the trick. The kernel boots, jack and alsa seem to work 
> normally (after removing the alsa-plugins-pulseaudio package), but with 
> one weirdness: the audio level is really low. I'm using the built-in 
> Intel hardware:
>   Intel Corporation 82801H (ICH8 Family) HD Audio Controller (rev 03)
> 
> I've cranked every output level that I know about up to maximum, but 
> everything (audio CD, soundfile playback, full-scale sine wave from Pd, 
> tried all from both jack and alsa) sounds somewhere between pianissimo 
> and piano in headphones, and non-existent from the built in speakers 
> (I'm assuming it's there but masked by the fan noise). Just to be sure, 
> I verified that the audio hardware works normally on the same machine 
> booted in OS X. I must be missing something obvious... Help? 

I found this:
  http://ubuntuforums.org/archive/index.php/t-611345.html

May contain the beginning of an answer (maybe :-)
It is related to the post from Len which included this URL:
([PlanetCCRMA] Jack and Intel 82801g Audio - Possible Solution for us)

http://www.mjmwired.net/kernel/Documentation/sound/alsa/ALSA-Configuration.txt

Very good resource!
Look for "imac" in that file (maybe try "model=imac-intel-20"?)

-- Fernando
 
CD: 3ms