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Re: No sound-inputs but sound recording FMIT




GiaThnYgeia wrote:

> I don't see how the previous got linked to a previous thread so I am
> reposting with additional clarification.
> 
> OK, I did some testing on an other machine with a testing installation,
> downloaded FMIT (an instrument tuner that will pickup audio input/analog
> and tell you all kinds of stuff about the wave that is fed).
> Same exact behavior, hardware only lists two audio inputs and are both
> unplugged.  The lower the db threshold for sound recording the more
> apparent the sound becomes.  Each knock on the box shows corresponding
> amplification of that noise.
> 
> Ok, so I picked up 2-3 live debian based USB sticks I have.  I plugged
> then in to 3 different machines, downloaded FMIT and run it.  Similar
> results.  So it has nothing to do with my configuration of stuff.  I say
> if some software is picking up sound from your environment and records
> it when no inputs are plugged in I would call this a "security" issue
> not a malfunction.
> 
> What is there MORE to post so it can be reproduced?  Blank live debian
> installations adding FMIT in 3 machines Jessie + Stretch (one on UPS,
> one on mains-plug, on laptop) if you allow it to see a wide spectrum of
> frequencies it records noise (mostly hi-freq) and only hardware inputs
> are unplugged.  Where is the noise coming from?
> 
> It probably has nothing to do with the program itself but its
> dependencies and some code feeding in wrong data as audio input.  But it
> is actual sound

I was interested in your mainboard - perhaps it has integrated mic.

Do you have pavucontrol installed? Go to input devices and mute the mic

regards