Comment 2 for bug 569071

This is already fixed upstream (http://git.kernel.org/?p=linux/kernel/git/tiwai/sound-2.6.git;a=commitdiff;h=ff818c24c2af370153646d302d831b69b023816f). It won't ship in Lucid final, but you can use linux-alsa-driver-modules-$(uname -r) from ppa:ubuntu-audio-dev.