I've written a short patch against alsa-driver-1.0.23 which should enable line-in correctly on the mb5 model which you can grab from my Dropbox account.
To use it, you'll first need to uninstall any version of linux-backports-modules-[karmic|lucid]-alsa that you've got installed (as these will override the manually compiled and installed modules which we're about to build).
Then download alsa-driver-1.0.23, patch it, compile and install the new drivers:
Code:
cd ~
wget http://dl.dropbox.com/u/174251/alsa-driver-1.0.23-mb5-inline-fix.patch
wget ftp://ftp.alsa-project.org/pub/driver/alsa-driver-1.0.23.tar.bz2
tar xjf alsa-driver-1.0.23.tar.bz2
cd alsa-driver-1.0.23
patch -p1 < ../alsa-driver-1.0.23-mb5-inline-fix.patch
./configure
make
sudo make install
Then simply reboot and with any luck line-in will now work as expected.
Let me know if you have any problems.
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