Comment 10 for bug 218165

I have an Acer Aspire 8920g and Alsa's snd-hda-intel does not have a model that works completely on it yet. However after some help on the Alsa lists, I was able to get it working for stereo anyway on internal speakers. See this post:

http://mailman.alsa-project.org/pipermail/alsa-devel/2008-May/007653.html

This is on Fedora 9, but it is not a distro-specific issue (assuming your distro builds the kernel with CONFIG_SND_HDA_HWDEP anyway, otherwise you are into rebuilding alsa with that option as well as the applet mentioned in the post above).