Inverted speaker stereo polarity

[Artcfox]

I recently received a Pinebook Pro (September 2020), and noticed that my speaker output has the polarity reversed.

The contents of: 

Code:

/etc/acpi/audio_jack_plugged_in.sh

was:

Code:

#!/usr/bin/env sh

case "$3" in
        plug)
                amixer sset Speaker off
                amixer sset 'Playback Polarity' Normal ;;
        unplug)
                amixer sset 'Playback Polarity' 'R Invert'
                amixer sset Speaker on ;;
esac

but when I tried running one of those commands manually I received the following error message:

Code:

Unable to find simple control 'Playback Polarity',0

Once I modified the contents of the file to:

Code:

#!/usr/bin/env sh

case "$3" in
        plug)
                amixer -c 0 sset Speaker off
                amixer -c 0 sset 'Playback Polarity' Normal ;;
        unplug)
                amixer -c 0 sset 'Playback Polarity' 'R Invert'
                amixer -c 0 sset Speaker on ;;
esac

It works properly, and my speakers are no longer out of phase.

This is the YouTube video I used to test the polarity: https://www.youtube.com/watch?v=H-kxtKGR2vY