Problems recording the line output on laptop

[Joel Rees]

2021年5月30日(日) 5:04 MR ZenWiz <mrzenwiz at gmail.com>:

> On Sat, May 29, 2021 at 1:48 AM Colin Law <clanlaw at gmail.com> wrote:
> >
> :
> >
> > This describes how I do it
> > https://askubuntu.com/questions/229352/how-to-record-output-to-speakers
>
> Regrettably, that does not work for me.  Let me explain.
>
> I have ALSA and pavucontrol installed - they're the default, if I'm
> not mistaken.
>
> When I start Audacity, I click the microphone icon in the top bar and
> select "Start Monitoring."  This shows me what audacity will pick up
> when I click record.
>
> If my microphone is set to "default" or "pulse", I get no response at
> all.  The only response I get is on "sysdefault" and that works fine.
>
> Except - after that when I click record and open the sound control
> mixer (pavucontrol) from the panel, in the Recording tab it says no
> applications running that are recording, even though audacity is.
>
> It also shows only Analog Duplex Mono or Stereo in the Configuration
> tab.  There is no other device pavucontrol sees for configuring the
> input or output devices.
>
> It's probably something screwy in the way LG presents the devices.  As
> I said before, my desktop never has this problem whether I'm using the
> built in mic/spkr jacks or my USB Logitech headset.  It sees all the
> devices from which to choose.  The LG does not.
>

I've fussed with this on an old Panasonic Let's note laptop, and I don't
remember everything, but I think I tried adding the jackd patchpanel and
was sort of able to patch an output to an input, but it was really
unstable. Would quit recording almost immediately.

Reading between the lines, it looks like the loops required to be jumped
through to get around the DMCA hardware in some devices also require a lot
of concurrent processor power (more cores than I have).
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