Disclaimer: I also posted this question at LinuxQuestions.org. I have Mint 14 (based on Ubuntu 12.10) installed right now, but this problem exists with stock Ubuntu 12.10 as well. If you insist, I can install straight Ubuntu 12.10 for the purposes of troubleshooting.
I have an HT Omega eClaro sound card based on the C-Media CMI8788 which is supported under ALSA with the snd-oxygen module. The card is not loaded by ALSA as a sound device either at boot time or by modprobing.
Relevant output of
04:00.0 Multimedia audio controller: C-Media Electronics Inc CMI8788 [Oxygen HD Audio]
0 [NVidia ]: HDA-Intel - HDA NVidia HDA NVidia at 0xf6080000 irq 17 1 [Q9000 ]: USB-Audio - QuickCam Pro 9000 Logitech, Inc. QuickCam Pro 9000 at usb-0000:00:1a.0-1.3.1, high speed
The snd-oxygen module is not loaded at boot (not listed under
lsmod). After I run
sudo modprobe snd-oxygen the module loads but the device is still not accessible to
snd_oxygen 20948 0 snd_oxygen_lib 41273 1 snd_oxygen snd_mpu401_uart 14169 1 snd_oxygen_lib
Some possibly relevant websites: