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Solved: No mic from combo jack.

On Wed, Dec 26, 2018 at 8:06 AM Dan Ritter <dsr@xxxxxxxxxxxxxxxx> wrote:
This sounds like a hardware problem, actually. Try cleaning out
the jack -- you could have some dust trapped in there making
the connection fail.

Variation on the theme, but you were right, it was a hardware problem.  I didn't have the L plug fully inserted on the headset end of the cord, it was ever so slightly pulled out.