Comment 58 for bug 394500

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Peter Meiser (meiser79) wrote : Re: [Karmic] processes holding /dev/dsp* or /dev/snd/pcm* cause "pulseaudio: card not found - Null Output / Dummy Output"

The problem is also seen with snd-hda-intel in combination with hsfmodem:

**** List of PLAYBACK Hardware Devices ****
card 0: Intel [HDA Intel], device 0: AD198x Analog [AD198x Analog]
  Subdevices: 1/1
  Subdevice #0: subdevice #0
card 0: Intel [HDA Intel], device 1: AD198x Digital [AD198x Digital]
  Subdevices: 1/1
  Subdevice #0: subdevice #0
card 0: Intel [HDA Intel], device 6: Conexant HSF Modem [Conexant HSF Modem]
  Subdevices: 0/1
  Subdevice #0: subdevice #0

And there's no daemon like slmodemd involved.