you may need to provide a channel map
http://git.kernel.org/?p=linux/kernel/git/tiwai/sound.git;a=blob_plain;f=Documentation/sound/alsa/Channel-Mapping-API.txt
you may need to provide a channel map
http:// git.kernel. org/?p= linux/kernel/ git/tiwai/ sound.git; a=blob_ plain;f= Documentation/ sound/alsa/ Channel- Mapping- API.txt