The bug has been confirmed and resolved in BIOS version 1.4.0 and later. Please see this guide on how to update your firmware.

To correctly detect the headphones or headset has been connected, most Linux distributions require options snd-hda-intel model=headset-mode to be added to alsa-base.conf

On Ubuntu, Linux Mint, Zorin, elementary, MX Linux and Debian:

sudo add-apt-repository ppa:starlabs/ppa

sudo apt update

sudo apt install starlabs-labtop-mk-iv

On other Linux distributions:

1. Run the below terminal command:

echo "options snd-hda-intel model=headset-mode" | sudo tee -a /etc/modprobe.d/alsa-base.conf

Please note, you will need to reboot for the changes to take effect.