After installing Mint Linux on my computer, I noticed that the sound did not work. I tried a lot of things and then finally, thanks to the help of some guys from http://www.linuxmintusers.de, I found a solution.
First I identified the codec of my sound card:
drag@hell ~ $ head -n 1 /proc/asound/card0/codec* Codec: Realtek ALC892
Then i found a blog post regarding this problem. You can read it in German here: http://www.spacefish.biz/blog/2010/06/alc892-b-z-w-realtek-id-892-unter-ubuntu-10-04/
The problem is that the ALSA package of Ubuntu based distributions (maybe others too) does not include a module for the ALC892. But you can easily build it from the package http://files.spacefish.biz/LinuxPkg-5.15rc1.tar.bz2.
You just have to unpack it and execute the install script as root. After that you have to reboot your computer, then everything should work well.