my pc has an old Ubuntu Lucid 10.04 64bit installed but I've recently decided to change to something newer.
Unfortunately all distros I've tried have the same audio issue.
Besides the onboard audio, I have a quite old Hercules Game Theater XP, very nice and working fine on Lucid and before or on other distro, including the first mint editions up to mint10.
Unfortunately it seems the new distros do not ship with the CS46xx firmware.
The best result achieved so far was on a Mint Debian 2013 (LMDE): after following the debian guide http://wiki.debian.org/snd-cs46xx I have sound but not completely: the small desk speakers connected directly to the GameTheater box work, but the coaxial output does not.
I use a coaxial cable out from the sound card to a DAC converter eventually reaching the stereo amplifier.
My guess is that the coaxial output does not work with this firmware.
alsamixer shows all available volume sliders high and unmuted.
Google and the forums seem not to help.
Kernel is 3.2.0-4-amd64 and the audio part is:
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$ inxi -Axc 0
Audio: Card-1 Cirrus Logic CS 4614/22/24/30 [CrystalClear SoundFusion Audio Accelerator] BusID: 05:04.0
Card-2 NVIDIA CK804 AC'97 Audio Controller driver snd_intel8x0 at ports dc00 e000 BusID: 00:04.0
Sound: Advanced Linux Sound Architecture Version 1.0.24