I am pretty sure this should be fixed if you install the package 'linux-backports-modules-alsa-karmic-generic' - please try this and see if it fixes your sound problems before trying to manually patch the drivers.
I am pretty sure this should be fixed if you install the package 'linux- backports- modules- alsa-karmic- generic' - please try this and see if it fixes your sound problems before trying to manually patch the drivers.