Bug#770834: pulseaudio: MacBook 13"/2013: Only silence in microphone input (not muted)

[Felipe Sateler]

Control: tags -1 moreinfo

Hi Lucas,

On Mon, Nov 24, 2014 at 10:55 AM, Lukas F. Hartmann <lukas at mnt.mn> wrote:
> Package: pulseaudio
> Version: 5.0-13
> Severity: normal
>
> Dear Maintainer,
>
> I am running Debian Jessie on a MacBook Pro Retina 13" from 2103. Audio works fine except for microphone input, which always stays silent, regardless of mu
> ting/unmuting or volume settings or fiddling with alsamixer.
> The pavucontrol vumeter for Input Devices > Built-in Audio Analog Stereo > Port:Internal Microphone stays in a zero state.
>
> Alsamixer shows two Microphone capture devices ("Internal Microphone" and "Internal Microphone 1") while pavucontrol shows one stereo device. When I press
> space on "Internal microphone 1", the input in pavucontrol appears muted. When I unmute it, the volume meter is at 100% for a fraction of a second and then
>  goes down to zero. If I record directly after switching to "Internal Microphone 1", only a single "plop" noise is recorded and then silence. This does not
>  happen for "Internal Microphone" where only silence is recorded.
>
> I would expect to see a working volume meter when enabling the microphone in pavucontrol and to have working audio recording in client tools such as audaci
> ty.

I'm sorry I haven't been able to look into this. Could you try the
version of pulseaudio in experimental (5.99) and see if that works? If
not, please attach a verbose log[1] of pulseaudio when reproducing the
problem, and noting approximately when you did what (eg: approx 5
seconds after starting pa, I started pavucontrol, then muted the
input...).



[1] https://wiki.ubuntu.com/PulseAudio/Log

-- 

Saludos,
Felipe Sateler