Plugging in plain stereo headphones or aux (no external mic) turns off the phone's internal mic.
Not sure what I did to cause this issue, but pobably trying to replace DSP manager with Viper sound (neither worked).
I looked in build.prop but no audio settings in there and hoping someone knows where they are. I'm surprised I can't find an xposed module to control audio input/output.
LG Optimus L5, CM11 9.5 beta, SKernel RC4