Comment 73 for bug 394500

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Sam Freilich (l33tminion) wrote : Re: [Karmic] processes holding /dev/dsp* or /dev/snd/pcm* cause "pulseaudio: card not found - Null Output / Dummy Output"

Had the same problem after upgrading to Karmic on my laptop (a System 76 Pangolin). Disabled the SmartLink modem driver and things were working again.