[PlanetCCRMA] iMac Audio issues (was F8 on iMac won't boot)

Michael Gurevich gurevich at ccrma.Stanford.EDU
Thu Apr 17 03:32:39 PDT 2008

Thanks for the pointers. I think I've solved it by trial and error.

Tried adding
options snd-hda-intel model=imac-intel-20
to /etc/modprobe.conf, and that didn't work. On closer inspection, 
imac-intel-20 is listed under STAC9220/9221 hardware, and 
/proc/asound/card0/codec\#0 shows ALC885. (I know this info is available 
somewhere else too, but I always forget where).

Even though I have a 20-inch iMac, I tried
options snd-hda-intel model=imac24
which is listed under ALC882/885 in ALSA-Configuration.txt. That gave me 
sound from the built-in speakers, but not from the headphones, and only 
1 volume control in alsamixer.

options snd-hda-intel model=mbp3
seems to work (uhhh... naturally). It automatically switches from 
built-in speakers to headphones when I plug into the jack and gives me 
separate volume controls in alsamixer.

Yay. Now that I have sound, I can get back to coding :-(

Fernando Lopez-Lezcano wrote:
> 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
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