Upgrading to Ubuntu 18.10 didn't seem to help. Using a different set of
headphones also didn't work. Other audio sources work fine. Unplugging
the headphones from the line out port in the back panel of the computer
and plugging it in the front headphones port stops the crackling and the
flickering
Public bug reported:
There is an audio crackle every few seconds when I use headphones. Under
the sound tab in settings the "Line Out-Built-in Audio" device flickers
at the exact moment there is a crackle. By opening the pavucontrol audio
manager I can see the "Built-in Audio Analog Stereo" output
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