[Bug 1813604] Missing required logs.

This bug is missing log files that will aid in diagnosing the problem.
While running an Ubuntu kernel (not a mainline or third-party kernel)
please enter the following command in a terminal window:

apport-collect 1813604

and then change the status of the bug to 'Confirmed'.

If, due to the nature of the issue you have encountered, you are unable
to run this command, please add a comment stating that fact and change
the bug status to 'Confirmed'.

This change has been made by an automated script, maintained by the
Ubuntu Kernel Team.

** Changed in: linux (Ubuntu)
Status: New => Incomplete

** Tags added: bionic

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https://bugs.launchpad.net/bugs/1813604

Title:
Lineout and headphones audio keep switching automatically -- broken
audio

Status in linux package in Ubuntu:
Incomplete

Bug description:
I have been a long-term Ubuntu user (since 10.04) and take pride in
having fixed all problems on my own thanks to the excellent
documentation, but this time I am utterly stumped and have run out of
ideas (hence this report).

With my headphones jacked in, the line out and headphones output
options keep switching automatically, resulting in crackling (and
broken audio). I have tried many solutions I found online but none of
the suggested fixes work. I am attaching a video of what I see (note
that this happens automatically, I don't click anywhere)

This is not a hardware issue (the headphones work fine on another
machine running Ubuntu 16.04, and as far as I'm aware this problem
only appeared after I upgraded from 16.04 to 18.04).

$ lsb_release -rd
Description: Ubuntu 18.04.1 LTS
Release: 18.04

I have uploaded two different videos showing what I see here:
https://youtu.be/S49cEC5DRsk
https://youtu.be/zSfi5ko5nBY

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