Force sound mode on LG C1 OLED webOS TV

1-README.md

Force sound mode on LG C1 OLED webOS TVs

This script works around the annoying feature of LG webOS TVs which automatically change the sound mode to "Game optimizer" when Game optimizer is selected as the video mode.

It works around it by setting it back to a user-selected mode every 5 seconds in case it changed to something else.

To install it your TV needs to be rooted. See RootMyTV and WebOSBrew.

Make sure the TV date and time are up to date.

Then you can connect to your TV using SSH or the WebOSBrew Device Manager app and run the following to install it:

curl -L https://gist.githubusercontent.com/depau/de07e9424abac532d2d11eaeeac99a2b/raw/2-install.sh > /tmp/install.sh && bash /tmp/install.sh

To uninstall it, run instead:

curl -L https://gist.githubusercontent.com/depau/de07e9424abac532d2d11eaeeac99a2b/raw/5-uninstall.sh > /tmp/uninstall.sh && bash /tmp/uninstall.sh

To temporarily pause and restart the mod you can run:

systemctl stop force-sound-mode
systemctl start force-sound-mode

2-install.sh

#!/bin/sh
set -eu

SOUND_MODES="aiSoundPlus standard movie news sports music game"

echo "Available sound modes:"
# Print sound modes with index
for i in $(seq 1 7); do
    echo "- $i: $(echo "$SOUND_MODES" | cut -d ' ' -f "$i")"
done

# shellcheck disable=SC2039
echo -n "Select sound mode and press enter, or press Ctrl+C to cancel: [1-7] "
read -r SOUND_MODE_IDX

if [ "$SOUND_MODE_IDX" -lt 0 ] || [ "$SOUND_MODE_IDX" -gt 6 ]; then
    echo "Invalid sound mode number: $SOUND_MODE_IDX"
    exit 1
fi

SOUND_MODE=$(echo "$SOUND_MODES" | cut -d ' ' -f "$SOUND_MODE_IDX")

echo "Downloading scripts..."
curl -L https://gist.githubusercontent.com/depau/de07e9424abac532d2d11eaeeac99a2b/raw/3-force_sound_mode.sh \
  | sed "s/NEEDLE/$SOUND_MODE/g" >/var/lib/webosbrew/force_sound_mode.sh
chmod +x /var/lib/webosbrew/force_sound_mode.sh

curl -L https://gist.githubusercontent.com/depau/de07e9424abac532d2d11eaeeac99a2b/raw/4-20-force-sound-mode.sh \
  >/var/lib/webosbrew/init.d/20-force-sound-mode
chmod +x /var/lib/webosbrew/init.d/20-force-sound-mode

echo "Starting the mod... (it might disconnect you)"
/var/lib/webosbrew/init.d/20-force-sound-mode

echo "Done!"

3-force_sound_mode.sh

#!/bin/bash

set -o nounset

# Available modes:
# - aiSoundPlus
# - standard
# - movie
# - news
# - sports
# - music
# - game

sound_mode="NEEDLE"

function get_sound_mode() {
    luna-send -f -q settings.soundMode -n 1 'luna://com.webos.settingsservice//getSystemSettings' '{"category":"sound"}' \
        | grep soundMode \
        | cut -d ':' -f 2 \
        | tr -d ' "'
}

function set_sound_mode() {
        luna-send -f -n 1 'luna://com.webos.settingsservice//setSystemSettings' '{"category":"sound","settings":{"soundMode":"'"$1"'"}}'
}

while true; do
    if [[ "$(get_sound_mode)" != "$sound_mode" ]]; then
        set_sound_mode "$sound_mode"
    fi
    sleep 5
done

4-20-force-sound-mode.sh

#!/bin/bash

if ! [[ -x /var/lib/webosbrew/force_sound_mode.sh ]]; then
    echo "force_sound_mode.sh script not found or not executable!"
    exit 1
fi

cat > /run/systemd/system/force-sound-mode.service << EOF
[Service]
[Unit]
Description=Force the TV audio mode to a user preset

[Service]
ExecStart=/var/lib/webosbrew/force_sound_mode.sh
Restart=on-failure
RestartSec=5
EOF

systemctl daemon-reload
systemctl restart force-sound-mode

5-uninstall.sh

#!/bin/bash
systemctl stop force-sound-mode
rm -f /var/lib/webosbrew/force_sound_mode.sh
rm -f /var/lib/webosbrew/init.d/20-force-sound-mode

Thanks! This was a huge pain point for me, at least until I finally get an external speaker setup lol.