Comment 103 for bug 946232

The workaround did not work for me. I'm running pulseaudio 1:1.1-0ubuntu15.1 under Xubuntu 12.04 64-bit on a Dell Vostro 1400.

In addition to missing the controls for the internal microphone and speakers, the headphone auto-detect will work upon boot-up, but will randomly start to fail (speakers and headphones both playing). Restarting pulseaudio doesn't fix it, I have to reboot. This issue only started recently (not a problem under Xubuntu 11.10/11.04, and I don't recall it happening initially after installing 12.04).