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My laptop speakers are producing a tapping sound which occurs every ~2seconds and only when there is not other audio playing. When I connect external speakers the tapping is even loder (and still coming from internal speakers). I remember this wasn't happening a while ago.

I have made a recording of it - SoundCloud stream.

lshw produces this output concerning audio:

    *-multimedia
         description: Audio device
         product: SBx00 Azalia (Intel HDA)
         vendor: Hynix Semiconductor (Hyundai Electronics)
         physical id: 14.2
         bus info: pci@0000:00:14.2
         version: 00
         width: 64 bits
         clock: 33MHz
         capabilities: bus_master cap_list
         configuration: driver=snd_hda_intel latency=64
         resources: irq:16 memory:fbaf4000-fbaf7fff

What can I do to eliminate this sound?

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Have you resolved this or are you still looking for an answer? –  Seth May 7 '13 at 4:32
    
I sold the old laptop and now I have no problems anymore :) I still think it was a software problem though. –  Primož Kralj May 7 '13 at 11:04
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