Hi.

I had the same problem, commenting out the line

# options snd-hda-intel power_save=10 power_save_controller=N

in /etc/modprobe.d/alsa-base.conf solved it.

Hardware:
00:10.1 Audio device: nVidia Corporation MCP51 High Definition Audio (rev a2)

     *-multimedia
          description: Audio device
          product: MCP51 High Definition Audio
          vendor: nVidia Corporation
          physical id: 10.1
          bus info: p...@0000:00:10.1
          version: a2
          width: 32 bits
          clock: 66MHz
          capabilities: bus_master cap_list
          configuration: driver=HDA Intel latency=0 maxlatency=5 mingnt=2
          resources: irq:22 memory:f6100000-f6103fff


I had a really bad ugly and loud THUMP every time a sound goes out after a few 
seconds of silence.

If it helps, using the line-out of the sound card, not the speaker
connector.

-- 
thump when starting to play audio
https://bugs.launchpad.net/bugs/476190
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