Because of skype sound issues I installed pavucontrol and I can change settings so the sounds work again with skype. I had to set both (recording&playback of skype) to "built-in Audio Analog Stereo" instead of "Monitor of built-in Audio Digital Stereo (HDMI)", I could only edit it when a skype call was in progress.
But unfortunately after a while not using skype the settings in the pavucontrol return to the default sink "Monitor of built-in Audio Digital Stereo (HDMI)", even though I press the lock sign in pavucontrol …
How do I make the changes to pavucontrol permanent?
I use Skype 4.008 in Ubuntu 12.04 (AMD64).
Interestingly the "Monitor of built-in Audio Digital Stereo (HDMI)" does not show up in the "Sounds settings" of gnome-control, there is only one sink "Analog output – built-in Audio".
I've uploaded to Pastebin the output from pacmd list-sinks and pacmd list-modules.
Best Answer
A simple configuration setting helped me so far (half a year) on Ubuntu LTS 12.04. In pavucontrol in the last tab "configuration", I have two "Built-in Audio" section where I can choose a profile. The first one had "Digital Stereo (HDMI) Output" as profile. I changed this to "Off" and I had the above described problem not anymore. Here is a screenshot: