Please remove linux-backports-modules-alsa, enable karmic-updates, dist-upgrade to the latest kernel, enable the ubuntu-audio-dev PPA, and install linux-alsa-driver-modules-2.6.31-19-generic.
Please remove linux-backports -modules- alsa, enable karmic-updates, dist-upgrade to the latest kernel, enable the ubuntu-audio-dev PPA, and install linux-alsa- driver- modules- 2.6.31- 19-generic.