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a60fb26
(Get the code!)
After reverting to the original alsa-base.conf, I managed to make my internal mic work through some experimenting with alsamixer. This is still using the new version of pulseaudio from the PPA, as well as the config file patches mentioned above. I am using the "Analog Stereo Duplex" configuration in pauvcontrol, which is my default mixer (since I'm using Xubuntu).
There are two internal mics being reported on my system, according to alsamixer - "Internal Mic" and "Internal Mic 1". pauvcontrol lists four possible input configurations:
1. "Analog Input/Microphon
2. "Analog Input/Microphon
3. "Internal Microphone"
4. "Microphone"
It appears that "Internal Mic 1", which shows up in pauvcontrol as "Analog Input" (?), is my actual internal microphone. If I select "Internal Mic" (input option #3) in pauvcontrol, it mixes "Internal Mic" and I get no input.
If I select pauvcontrol input option #2 (used for the attached alsa-info file), alsamixer shows "Internal Mic 1" as the primary input. I tested this with Skype and it works well. If I select pauvcontrol input option #1, the microphone works, but the mixer starts automatically reducing the level (which limits the usefulness).
For the sake of completeness, I experimented using an external microphone plugged into the jack on the front of my laptop. pauvcontrol input configurations #1 and #2 did not work for the external mic. Configuration #4 worked as expected. There was no automatic selection/detection of the external microphone.
In summation, it looks like I got things working. My internal microphone is showing up as "Analog Input", or "Internal Mic 1" in alsamixer. I'm not sure what is showing up as the "Internal Mic". I am not sure if the new version of pulseaudio + the patches are having any effect.