From the ALSA wiki
This card is supported by ALSA-DRIVER 1.0.6 and later versions. Follow instructions in INSTALL file.
With 1.0.6 and 1.0.8 use this option to configure your card:
With 1.0.9rc2 (latest version):
The volume control is not yet supported.
Retrieved from "http://alsa.opensrc.org/Cmi9880"