Touching my stupid thinkpad volume keys had been boosting PCM mixer setting to 100%, which usually makes the system sound terrible. Stumbled on this Karmic bug/FAQ:
https://bugs.launchpad.net/ubuntu/+source/pulseaudio/+bug/420578
sudo sed -i.bak -e ’s/volume = merg/volume = ignore/’ /usr/share/pulseaudio/alsa-mixer/paths/*analog*

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