[pulseaudio-tickets] [Bug 87814] Microphone has loud static/distortion when volume is not 100%

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=87814

--- Comment #8 from Raymond <superquad.vortex2 at gmail.com> ---
http://cgit.freedesktop.org/pulseaudio/pulseaudio/tree/src/modules/alsa/alsa-source.c

  /* Shift down by the base volume, so that 0dB becomes maximum volume */
    pa_sw_cvolume_multiply_scalar(&r, &r, s->base_volume);

    pa_log_debug("Read hardware volume: %s",
                 pa_cvolume_snprint_verbose(volume_buf, sizeof(volume_buf), &r,
&s->channel_map, u->mixer_path->has_dB));

    if (pa_cvolume_equal(&u->hardware_volume, &r))
        return;

    s->real_volume = u->hardware_volume = r;


you have to provide pulseaudio verbose when you change volume from min to max
as 0dB is not inside dB range


pa_log_debug("Requested volume: %s",
                     pa_cvolume_snprint_verbose(volume_buf, sizeof(volume_buf),
&s->real_volume, &s->channel_map, true));
        pa_log_debug("Got hardware volume: %s",
                     pa_cvolume_snprint_verbose(volume_buf, sizeof(volume_buf),
&u->hardware_volume, &s->channel_map, true));
        pa_log_debug("Calculated software volume: %s (accurate-enough=%s)",
                     pa_cvolume_snprint_verbose(volume_buf, sizeof(volume_buf),
&new_soft_volume, &s->channel_map, true),
                     pa_yes_no(accurate_enough));

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