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/Microphone/Microphone"
2. "Analog Input/Microphone/Line In"
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.

** Attachment added: "alsa-info.txt.BN9n2YvSy2"
   
https://bugs.launchpad.net/ubuntu/+source/pulseaudio/+bug/946232/+attachment/3217911/+files/alsa-info.txt.BN9n2YvSy2

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https://bugs.launchpad.net/bugs/946232

Title:
  [Meta-bug] Missing speaker and/or internal mic port

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