Built-in Mic Issue with Linux Mint 7 (Ubuntu 9.04) Vostro 1400

Issue
Built-in digital mic does not work in Ubuntu 8.10 and newer. Similar situation with recent Fedora and OpenSuse. It was located as PulseAudio issue, but I never managed to fix it. Recently playing with Linux Mint 7 XFCE and standard GNOME I started looking for a fix and had luck with the following:
https://bugs.launchpad.net/ubuntu/+source/pulseaudio/+bug/275998/comments/109

Fix
I followed the directions and here are some snapshots:

• First, edit or create /etc/asound file. Add the following text displayed in the picture below to add a new device called "alsaboost". Use command:
  sudo gedit /etc/asound
  

• Then edit /etc/pulse/default.pa file. Insert the following two lines where shown in the picture below. Use the following command:
  sudo gedit /etc/pulse/default.pa
  

• Reboot computer here for new settings to take place

• Go to Volume Control... and click on Preferences, then select +50db Mic
  

• Then in the Volume Control, you should see a slide bar for +50dB Mic

• This can also be adjusted from Terminal using command alsamixer:

Skype

• In Skype, in Options for Sound Devices, select Sound In to be new "alsaboot" component, and Sound Out and Ringing to be "pulse"

References
https://bugs.launchpad.net/ubuntu/+source/pulseaudio/+bug/275998/comments/109