[pulseaudio-discuss] FW: Linking Channels Block Mono Microphone

[John Frankish]

> >>> On 10/22/2012 08:50 AM, John Frankish wrote:
> >>> Using pulseaudio-2.1 with a dell latitude e6220 and the internal mono microphone:
> >>>
> >>> The pavucontrol "configuration" tab correctly shows the internal microphone as mono.
> >>>
> >>> The pavucontrol "input" tab incorrectly assumes the internal
> >>> microphone is stereo and any input is blocked until the "link channels" icon is clicked in order to unlink the channels.
> >>>
> >>>   From google I can see that several people have seen the same problem, but I don't see a solution/bug fix anywhere.
> >>>
> >>> Is there some way to add/edit/modify a configuration file to avoid
> >>> having to remember to unlink the microphone channels every time?
> >>
> >> We do this through a kernel patch usually. Can you submit alsa-info
> >> (see https://wiki.ubuntu.com/Audio/AlsaInfo )?
> >>
> > Thanks for the reply, please see:
> >
> >http://www.alsa-project.org/db/?f=de69a107ac63f0a3629cd16fe9b89d23ccef5888
> 
> Sorry for not replying earlier; I was hoping you had a Conexant or Realtek
> codec where we already have code for this, and can just add quirks. For IDT
> codec driver we need to write some extra code, and I can't promise I have
> time to do this right now. Sorry.

Thanks for the reply anyway :)
I guess this means I'm stuck for the time being :(

> > I upgraded to pulseaudio-2.1 and tried on another machine and the result is the same.
> >
> > Furthermore, looking in the "input devices" tab (see attached screenshot):
> >
> > 1. The usb headset microphone is correctly shown as a mono microphone, but the input level strip is missing.
> >
> > 2. The internal sound card microphone input level strip is present.
> >
> >
> > Looking at the "recording" tab (see attached screenshot):
> >
> > 1. The usb headset microphone is incorrectly shown as a stereo
> > microphone
> >
> > 2. The input level strip is missing.
> >
> > 3. Even if I unlink the stereo channel lock, the input is not recorded.
> >
> > 4. If I swap to the internal sound card microphone, the input level strip reappears.
> >
> >
> > The Logitech usb headset must be a pretty common device, but its use
> > appears broken as far as pulseaudio-2.0/2.1 are concerned?
> 
> I have a Logitech usb headset and it works just fine (Ubuntu Quantal, which
> runs PulseAudio 2.1 and Linux 3.5 kernel).
> 
> It gives a output-stereo + input-mono profile as default.
> 
I also get that as the default profile - but at the linux-3.0.21 kernel I'm far from 3.5...