Problems on Apple iBook with ALSA and snd-powermac [2.6.11.5]

[Martin Loschwitz <madkiss@madkiss.org>]

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Hi folks,

given that the alsa-user-mailinglist has some strange kind of authentication
mechanism, and admin-authorization and whatever, I'm writing this mail to the
LKML (it would have been CCed here anyway).

The current snd-powermac module from ALSA seems to have trouble with modern
Apple iBook computers (and possible other Apple notebooks, but I can't tell
for sure). With 2.6.11.5 and having snd-powermac loaded, playing some sound
results in a very noisy playback; you can only hear that if you turn volume
on the PCM and VOL mixers up to the maximum, and even then, it's very hard 
to hear. After removing snd-powermac and loading the "old" pmac-driver, the
sound playback works just fine.

I have been able to find out that with 2.6.8 (at least with the version that
Debian ships currently), the problem does not appear; snd-powermac does its
job very nicely there. Given that 2.6.11 included some ALSA changes, I just
compiled 2.6.10 on this box and booted it, and had the same problems I have
with snd-powermac on 2.6.11.5.

Is this a known problem and is a fix available for it? If not, what can I do
to help with hunting this bug? I really like ALSA and prefer it over the old
pmac-sound-driver.

-- 
  .''`.   Martin Loschwitz           Debian GNU/Linux developer
 : :'  :  madkiss@madkiss.org        madkiss@debian.org
 `. `'`   http://www.madkiss.org/    people.debian.org/~madkiss/
   `-     Use Debian GNU/Linux 3.0!  See http://www.debian.org/

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