Here's the tool "one of the Mandriva guys" ;-) was talking about the other day. I should probably have announced it on both lists simultaneously.
Anyway, over the previous weeks I've been working on a small script which tests whether the ALSA mixer lives up to PA's expectations. If you are familiar with dbmeasure or dbverify by Lennart Poettering, this application's purpose is very similar, but this one is hopefully easier to set up, more user friendly, and also tests that the names of the volume controls are correct. My hope is that this will aid as a debugging tool for all these "everything below 20% of my speaker is muted, and then 21% blows my speakers" bugs.
To use the tool, you'll need some kind of loopback. You can e g use a loopback cable and connect that between line in and line out, or test your laptop's internal speakers with your laptop's internal mic (just stop humming when you do so :-) ). Just set up the recording levels appropriately.
Alsamixertest is available for Ubuntu Lucid and Ubuntu Maverick from these PPAs: Lucid: https://launchpad.net/~diwic/+archive/ppa Maverick: https://launchpad.net/~diwic/+archive/maverick
For other distributions, download the tarball: https://launchpad.net/~diwic/+archive/ppa/+files/alsamixertest_47.14.tar.gz Unpack and read the readme file for compilation and install instructions.
When it is installed, run "alsamixertest -r" for a small tutorial and "alsamixertest -h" for command line options help.
Looking forward to your comments about this new little tool! I think it should be considered "beta" quality at this point.