Either a recent round of system updates or installing the "linux-backports-modules-alsa-karmic-generic" package as recommended seems to have done the trick for me. Still not sure whether this was the same issue as the original post, though.
Either a recent round of system updates or installing the "linux- backports- modules- alsa-karmic- generic" package as recommended seems to have done the trick for me. Still not sure whether this was the same issue as the original post, though.