Bug#766781: pavucontrol: Input volume cannot be more than 39%

[Felipe Sateler]

Hi Jean,

On Tue, Nov 4, 2014 at 9:02 AM,  <jbernon at free.fr> wrote:
> New thing. My jessie installation was a standard one with very few contrib
> and non free packets. Following your idea about alsa, I installed
> alsa-firmware. It fixed one point (both the jack microphone and the built-in
> one are working now) but not the weird thing between alsa mic boost bar and
> pavucontrol volume level.

OK I just confirmed that this is desired behavior is pulseaudio, and
that this is probably a bug in your driver.

Pulseaudio by default "merges" the mic and mic boost controls into a
single volume control. What is happening to you is that the boost
control seems to be broken.

Please try upgrading your kernel (your kernel was a few versions
behind when you reported the bug). If that doesn't work out, we should
reassign this bug to the kernel.

As a workaround, you can try editing
/usr/share/pulseaudio/alsa-mixer/paths/analog-input-mic.conf and
inside the element [Element Front Mic Boost], set  "volume = zero".
That should disable merging of the two controls.

-- 

Saludos,
Felipe Sateler