[pulseaudio-discuss] Logitech Webcam's integrated mic works, but not used or functional in Google Hangouts. Where to start troubleshooting?

[hal469 at xsmail.com]

I run various flavors of linux, with release &/or 'stable' kernels.

In all cases, it's KDE w/ pulseaudio. E.g., on my desktop machine,

	rpm -qa | grep -i pulse | sort
		alsa-plugins-pulse-1.1.6-122.1.x86_64
		libpulse0-11.1-14.1.x86_64
		libpulse0-32bit-9.0-8.1.x86_64
		libpulse-devel-11.1-14.1.x86_64
		libpulse-mainloop-glib0-11.1-14.1.x86_64
		libxine2-pulse-1.2.9-133.3.x86_64
		mpg123-pulse-1.25.10-28.2.x86_64
		pulseaudio-11.1-14.1.x86_64
		pulseaudio-bash-completion-11.1-14.1.x86_64
		pulseaudio-lang-11.1-14.1.noarch
		pulseaudio-module-gconf-11.1-14.1.x86_64
		pulseaudio-module-jack-11.1-14.1.x86_64
		pulseaudio-module-lirc-11.1-14.1.x86_64
		pulseaudio-module-x11-11.1-14.1.x86_64
		pulseaudio-system-wide-11.1-14.1.x86_64
		pulseaudio-utils-11.1-14.1.x86_64


I've got Logitech webcams attached -- with both video & audio.  E.g.,

	hwinfo
		...
		76: USB 00.3: 0000 Unclassified device
		  [Created at usb.122]
		  Unique ID: 82fT.dxozCEIXKDA
		  Parent ID: qe89.xvTGa+XkbXF
		  SysFS ID: /devices/pci0000:00/0000:00:05.0/0000:04:00.0/usb2/2-2/2-2.4/2-2.4.3/2-2.4.3:1.3
		  SysFS BusID: 2-2.4.3:1.3
		  Hardware Class: unknown
		  Model: "Logitech HD Pro Webcam C920"
		  Hotplug: USB
		  Vendor: usb 0x046d "Logitech, Inc."
		  Device: usb 0x082d "HD Pro Webcam C920"
		  Revision: "0.11"
		  Driver: "snd-usb-audio"
		  Driver Modules: "snd_usb_audio"
		  Speed: 480 Mbps
		  Module Alias: "usb:v046Dp082Dd0011dcEFdsc02dp01ic01isc02ip00in03"
		  Config Status: cfg=new, avail=yes, need=no, active=unknown
		  Attached to: #80 (Hub)

The cam & mic work fine.  I can record audio via the mic in, e.g. Audacity, with no problems.

BUT ...

when in Google Hangouts videocon, video works perfectly, but the audio simply does not function.

Otoh, If I attach a _separate_ mic via USB, it works fine -- Hangouts uses video from the Logitech + audio from the separate mic.

'Something(TM)' about this integrated cam+mic, &/or my config, is clearly a problem for Hangouts.

I don't know yet where to start looking to troubleshoot this.

Any guidance as to where the problem might originate? Or even where to begin to look?

Hal