Hi, I've managed to get down to the issue and found out that this is related
to the removal of alsa firmware from kernel on Debian, since 2.6.23.
The reported issue is fixed by downloading the alsa-firmware package
from alsa-project.org, compiling the source and installing it into
You need first to create the yamaha dir, which might not be present, and
to copy the .fw files. You'll also will be likely to want to install
the package alsa-firmware-loaders.
Maintainer can close this, as it seems an alsa bug. What would need more
atention here is to prompt user and let she know that it's likely required
to have the firmware files to get her hardware working.