[gentoo-user] alsa-driver: "Unknown symbol in module" error

[Grant]

My Dell Vostro 1320 doesn't mute the external speakers when headphones
are plugged in.  These guys seem to have fixed the problem by
upgrading to the latest version of alsa-driver, alsa-lib, and
alsa-utils:

http://forums.linuxmint.com/viewtopic.php?f=49&t=27987&p=168950

I'm on the latest hardened-sources in the tree which is 2.6.29.  I'm
thinking I need a newer version of the snd-hda-intel driver and I
don't want to switch kernels.  I tried to switch to the latest
alsa-driver, alsa-lib, alsa-utils, and alsa-headers, but I ended up
with a bunch of "Unknown symbol in module" errors.  The error is
described here:

http://www.gentoo.org/doc/en/alsa-guide.xml

but the 2 solutions (rm -rf /lib/modules/$(uname -r)/alsa-driver and
some device_mode stuff) don't work for me.  Does anyone know how I can
fix this?

- Grant