This problem persists in Lucid Lynx with my System76 Pangolin Panp4n
laptop. There is some conflict between the package modemmanager and
pulseaudio that causes pulseaudio to lose the sound hardware. It
replaces it with "dummy" and will not produce sound unless I uninstall
modemmanager. As Lucid is supposed to be the bug killer release, this
one would be a nice one to dispose of. I'd like to be able to fax things
on occasion using my modem, and as it is, the modem is unuseable without
sacrificing sound.

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[Karmic] softmodem-opened /dev/snd/pcm* cause "pulseaudio: card not found - 
Null Output / Dummy Output"
https://bugs.launchpad.net/bugs/394500
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