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bbfa235
(Get the code!)
I've run the apport command because the bug seemed abandoned, but I exhibit the exact same symptoms. This is a Lenovo E490, my headphones use a TRS plug, but the system detects it as TRRS (i.e. believes it also has a microphone). To confirm, I've also checked:
* Headphones with a TRRS cable behave correctly on this machine (their microphone is used)
* My same TRS headphones (no microphone), on a Chromebook, have the plug detected correctly as TRS, and the Chromebook uses its internal microphone while sending audio to the headphones.
There does not appear to be a way, in Linux, to configure the system to use the internal microphone while anything is plugged into the headphone jack.