Earphone noise while charger is plugged in

[ZimbiX]

Earphone noise while charger is plugged in. Temporarily resolved while music is playing, including at volume 0.

There is a loud noise through the headphone jack while charging - a really strange staticy buzzing that changes pitch when touching the screen or the phone is vibrating. It's only suppressed while playing audio. The noise is still suppressed for about a second after pausing - it's as if an audio module goes to sleep while audio isn't playing, and while it's asleep, interference is let in. Playing audio on volume 0 works to suppress it. I wonder if having a silent audio file always playing in the background would work as a workaround without too much impact on battery life...

This is probably related to the speaker noise issue in https://github.com/shymega/planet-devices/issues/9, but is separate, as there's no good workaround.

Device: Cosmo Communicator Android build number: Cosmo-9.0-Planet-02032021-V25