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[ThOR27 <thor27@xxxxxxxxx>]

I'm having this same problem on a MacBook 5,2

if I use:

model=mb5
Sound works after unmuting HP, but no headphones detection and no subwoofers

model=mbp3
Headphones detection works, sound works but no subwoofers


model=asus-a7m
Headphone detection doesnt works, but subwoofers works and sound seems much cleaner.

I'm with linux-backports-modules-alsa-karmic-generic installed, and no
changes with that.

Ubuntu Karmic 9.10 with alsa-backport
MacBook 5,2

Don't know what kind of extra information is needed for this but I can
inform if requested.

Thanks.

-- 
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 “linux” package in Ubuntu: Fix Committed
Status in “linux-backports-modules-2.6.31” package in Ubuntu: Fix Released

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