There are some bugs in the sound system inherited upstream in ubuntu karmic. If you install the linux-backports-modules-karmic and linux-backports-modules-karmic-generic and update your kernel to the latest 2.6.31-18, some of these issues appear to have been fixed. You might also have to install linux-backports-modules-alsa-2.6.31-18-generic after you have rebooted into the new kernel.
To install the backpost modules, simply enter [b]apt install <name as above>/b] in a terminal. To update your kernel, in mintupdate go to Edit | Preferences and put a tick against level 5 under the visible column. Exit preferences then do a Refresh, you should find the updates unticked. Select all the level 5 updates and Install.
Do this at your own risk.
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