Wow, that seems to be the right direction (and I'm learning about
linux):

After a (clean) boot (resulting in a "dummy device" sound output) fuser
gives the following:

$ sudo fuser -v /dev/dsp /dev/snd/*
                     USER        PID ACCESS COMMAND
/dev/snd/controlC0:  Slmodemd   1213 F.... slmodemd
/dev/snd/pcmC0D6c:   Slmodemd   1213 F.... slmodemd
/dev/snd/pcmC0D6p:   Slmodemd   1213 F.... slmodemd

Following a "alsa force-reload" the output changes to:

$ sudo fuser -v /dev/dsp /dev/snd/*
                     USER        PID ACCESS COMMAND
/dev/snd/controlC0:  bernhard   3827 F.... pulseaudio
/dev/snd/pcmC0D0c:   bernhard   3827 F...m pulseaudio
/dev/snd/pcmC0D0p:   bernhard   3827 F...m pulseaudio

Yupp I realize that I made a typo missing an asterisk behind dsp, but I
think the point is quite clear. At boot time, the smartlink modem daemon
grabs all of the audiodevices. So it seems this bug is not really the
fault of pulseaudio but of slmodemd!

-- 
No sound with intel-hda without "alsa force-reload"
https://bugs.launchpad.net/bugs/449762
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