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73416ba
(Get the code!)
I've recently just run into the same problem since recent updates, I've had my XPS since October 2017 and am currently running Ubuntu 18.04.3. No issues until last week. I think I may have selected "headset with microphone" by accident once when inserting headphones without a microphone, but no evidence that this was related; I just remember doing it when I don't recall doing that before.
The initial workaround in this thread of updating "Headphone Mic Boost" setting up one notch in alsamixer works for me, so I assume this is a regression or was this never fixed?