SM-A500 earpiece is not set to mono

Describe your issue

When playing the speaker test on GNOME Settings app under Phosh UI, only front left can be heard, front right remains silent.

What's the expected behaviour?

The announcer (?) should say "Front Left" and "Front Right" and the user can hear it through their speaker.

What's the current behaviour?

Only Front Left could be heard.

How to reproduce your issue?

1. Open Settings -> Sound
2. Change "Earpiece Playback" to "Speaker Playback"
3. Tap/Click on "Test"
4. Tap/Click on "Front Left" and "Front Right"

What device are you using?

SM-A500H (Dual SIM) - using samsung-a5 device package.

On what postmarketOS version did you encounter the issue?

• edge (master branch)

• v22.06

• I confirm that the issue still is present after running sudo apk upgrade -a

On what environment did you encounter the issue?

Environments

• Phosh
• Plasma Mobile
• Sxmo (Wayland/Sway) Please post the output of sxmo_version.sh
• Other: Please fill out

How did you get postmarketOS image?

• from https://images.postmarketos.org
• I built it using pmbootstrap
• It was preinstalled on my device

What's the build date of the image? (in yyyy-mm-dd format)

Not sure, I built the image from pmbootstrap about 2 days ago (2022-11-14)

Additional information

This issue probably can be rectified through some ALSA mixer config, may look into this.