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If you click on the "Input Devices" tab you should see, at the top, "Cx231xx Audio Analog Stereo" and below that...* Cx231xx Audio Analog Stereo:* Port: Analog InputYou will see the horizontal bar fluctuating indicating input sound (if your source has sound) but you will not hear any audio. THis is because there is a "pulseaudio module-loopback" which is not automatically loaded nor can it be loaded though the graphical interface. To add the loopback module to the running instance of Pulse Audio issue the command: pactl load-module module-loopbackTo make the module auto load issue the command: sudo sh -c ' echo "load-module module-loopback" >> /etc/pulse/default.pa 'Once module-loopback is loaded the pulse audio Volume Control panel will add an option to the Recording tab that allows selection to use on the loopback device.reference: [https://answers.launchpad.net/ubuntu/+source/pulseaudio/+question/83742 pulseaudio and saa7134 audio device]