I agree with Stan. This seems like a config (or rather, routing) problem.
Also, what application are you attempting to record audio into?
Here's an overview of Linux sound I wrote for
opensource.com:
https://opensource.com/article/17/1/linux-plays-sound
It might help you troubleshoot.
On Fri, Jun 21, 2019 at 1:27 PM stan via users
<users(a)lists.fedoraproject.org> wrote:
>
> On Thu, 20 Jun 2019 15:06:59 -0400
> Bob Goodwin <bobgoodwin(a)fastmail.us> wrote:
>
> > I rarely have computer audio problems, it usually just works. But
> > today I need to record voice and it does not do anything, pulse audio
> > shows rear microphone plugged in and the level is turned up. aplay
> > produces a test sound from the speaker and sound works as expected,
> > just no mic audio.
>
> > Any ideas welcome, Bob
> >
>
> It's a configuration problem. If pulse sees the mic, then alsa has
> recognized it.
>
> First thing, run
> alsamixer -c <card number>
> Then hit F4 to get to the capture screen. Make sure that the capture
> is turned on in alsa, and at a high enough level.
>
> Then, if you don't have it installed already, install pavucontrol.
> Bring it up and play around with the default settings (last tab) for the
> mic until you can see waveforms for capture in the capture tab.
>
> You could instead use arecord to try to capture some sound in a .wav
> file. I haven't done that for a long time, so you will have to read the
> man page, man aplay, to figure out how if you decide to do so.
>
> Another alternative is to use audacity to capture the sound from the
> mic. It also allows configuration for direct record from alsa, I think.
> So, you could disable the card in pulseaudio, and use alsa directly if
> you just can't get pulse to record.
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