Comment 71 for bug 946232

it is bug of module-switch-on-available port

For desktop computer which have front mic , rear mic, line in , CD and Stereo Mix

In Ubuntu 12.04 unity , only input souce which has jack plugged is showed in sound preference and those fixed port : Internal Mic, ac97 front panel jacks without jack detect , CD and Stereo Mix does not appear for user selection

For desktop , recording is completely unusable when there is no jack plugged into, it switch to other audio devices (e.g. Web Cam)

e.g. when you unplug mic from rear jack and plug into front mic or Line in, it automatically switch to other sound card since there is no plugged jack after you uplugged

Beside, some user may use the special feature of the Line in jack, the plugin of Line in does not mean that the user is intended to use Line in as Input Source, he may just connect the output of tv card to blue jack so that he can use the analog mixer to output the tv audio to the green jack