Your audio devices *are* recognized; see your Card0.Amixer.values.txt
and Card0.Codecs.codec.0.txt. Furthermore, PA only drops to the null
sink/source when something has already grabbed the sound device. Can you
obtain a verbose log (https://wiki.ubuntu.com/PulseAudio/Log) to verify?
** Changed in: pulseaudio (Ubuntu)
Status: New => Incomplete
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[Realtek ALC1200] pactl stat failed to find default card
https://bugs.launchpad.net/bugs/544228
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