david.henningsson at canonical.com
Mon Sep 27 01:53:29 PDT 2010
So 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
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
Alsamixertest is available for Ubuntu Lucid and Ubuntu Maverick from
For other distributions, download the tarball:
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.
David Henningsson, Canonical Ltd.
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