Richard, try installing the 'linux-backports-modules-alsa-karmic-generic' package and rebooting. This may, or may not solve your problem. After rebooting, double-check your mixer settings as some may become muted in the process.
Richard, try installing the 'linux- backports- modules- alsa-karmic- generic' package and rebooting. This may, or may not solve your problem. After rebooting, double-check your mixer settings as some may become muted in the process.