Ubuntu – Jack microphone-only detected as headset

I found that if I opened up the

Applications > Sound and Video > PulseAudio Volume Control

and under 'Configuration' changed my computer from 'Analog Stereo Output' to 'Analog Stereo Duplex', the mic was recognized and now works. This also resulted in the

System > Preferences > Sound

settings box showing the mic, whereas it did not show up before.

I solved "External" mic problems for Ubuntu 12.04.

I don't have internal mic for my dv1000 but the internal mic should work too.

Though I cannot get my dv1000 for Ubuntu 10.04 LTS work at all till now. (No matter with all possible how to, including updating alsa ppa.)

1. Open a Terminal Ctrl+Alt+T

2. Enter this command: gksu gedit /etc/modprobe.d/alsa-base.conf

3. Copy the below "option" and add it to the last line of that alsa-base.conf file:

   options snd-hda-intel model=auto enable=yes
   

4. Reboot

5. Go to "Sound" and go to "input" setting.

6. "Insert" your external microphone (ext.mic) jack into the "Mic in Jack hole" of the dv1000.

   If you don't insert the ext.mic, the Line In (ext.Mic) option will not be there.

7. You must select Line In Input (it is for our ext.mic), in order to enable External Mic.

8. Don't forget to un-mute the "mute" microphone option, if it is still checked. (mine is always muted)

9. Test new setting with Sound Recorder.

Source: This is taken from http://ubuntuforums.org/showthread.php?t=2018599 with an additional warning in step 6, and slight rewording elsewhere.