I have a similar problem, with my NVIDIA MCP78 / ALC662 soundcard
(complete config: http://www.alsa-
project.org/db/?f=539b8b2005922af2774faa3c85d8c208dea79425)
Alsa detects the devices and can play sound, but pulseaudio sometimes
doesn't see the devices.
My temporary workaround was to disable hardware autodetection in
/etc/pulse/default.pa
enabled static alsa module:
load-module module-alsa-sink
load-module module-alsa-source
disabled autodetection:
#.ifexists module-udev-detect.so
#load-module module-udev-detect
#.else
#load-module module-detect
#.endif
hope that helps
--
No sound after clean install of Karmic
https://bugs.launchpad.net/bugs/470463
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