The subwoofer in my MacBook Pro 5,1 works fine under Karmic - Lennart
have you actually tried Karmic to see if it works on your machine?
Unfortunately Karmic will not use 1.0.21, you'll have to wait for Lucid

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Subwoofer not working in Intel Macbooks
https://bugs.launchpad.net/bugs/305750
You received this bug notification because you are a member of Mactel
Support, which is the registrant for Mactel Support.

Status in ALSA driver: Unknown
Status in Mactel Support: Confirmed
Status in “alsa-driver” package in Ubuntu: New

Bug description:
Upon installation of Ubuntu 8.10, sound can be enabled by adding
"options snd_hda_intel model=mbp3" 
to /etc/modprobe.d/options
(This is needed due to a detection issue, but that is another bug)
After rebooting, the sound does work, but there is no sound from the Macbook's 
built-in subwoofer which makes the sound very poor sounding in comparison to 
how it sounds in OSX. This difference puts Ubuntu in a bad light. Users often 
complain about "tinny" or "poor quality" sound.

This is specifically occurring on Macbook4,1 models (and likely Macbook3,1 as 
well)

Reference:
https://bugtrack.alsa-project.org/alsa-bug/view.php?id=4086
http://sourceforge.net/mailarchive/message.php?msg_name=4935B32D.3060501%40forestfactory.de

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