Acabei de postar uma resposta para uma pergunta semelhante:
Linux Mint: como evitar a suspensão enquanto a música é Jogando
Eu escrevi um script para definir o tempo limite de suspensão para "Nunca" enquanto o pactl detecta uma fonte de áudio em execução e, em seguida, reverte a configuração quando nenhuma fonte de áudio é detectada.
Aqui está uma cópia da última resposta e script:
Eu fiz um pouco mais de trabalho no script acima e agora ele deve funcionar no Cinnamon, Mate e Ubuntu executando o Gnome. Eu experimentei as versões Live USB do Linux Mint 19 Cinnamon e Mate, assim como o Ubuntu 18.04 - Gnome.
#!/bin/sh
# Audiocaffeine
# Works in Linux Mint 19 - Cinnamon, Linux Mint 19 - Mate, Ubuntu 18.04 - Gnome
# Script to temporarily set suspend timout for AC and battery to "Never"
# while audio is playing. It then reverts the settings when audio is no longer detected.
# Determine if a valid desktop environment is running and exit if it doesn't.
echo "Reported desktop environment: ""$XDG_CURRENT_DESKTOP"
if [ "$XDG_CURRENT_DESKTOP" = "X-Cinnamon" ]; then
actimeoutid="org.cinnamon.settings-daemon.plugins.power sleep-inactive-ac-timeout"
batttimeoutid="org.cinnamon.settings-daemon.plugins.power sleep-inactive-battery-timeout"
disablevalue=0
elif [ "$XDG_CURRENT_DESKTOP" = "MATE" ]; then
actimeoutid="org.mate.power-manager sleep-computer-ac"
batttimeoutid="org.mate.power-manager sleep-computer-battery"
disablevalue=0
elif [ "$XDG_CURRENT_DESKTOP" = "ubuntu:GNOME" ]; then
actimeoutid="org.gnome.settings-daemon.plugins.power sleep-inactive-ac-type"
batttimeoutid="org.gnome.settings-daemon.plugins.power sleep-inactive-battery-type"
disablevalue="nothing"
else
echo "No valid desktop environment is running"
exit 1
fi
# Create .config directory to store settings if it doesn't exist.
if [ ! -d ~/.config ]; then
echo ".config directory not found!"
echo "Creating ~/.config"
mkdir ~/.config
fi
# Create audiocaffeine directory to store settings if it doesn't exist.
if [ ! -d ~/.config/audiocaffeine ]; then
echo "Configuration directory not found!"
echo "Creating ~/.config/audiocaffeine"
mkdir ~/.config/audiocaffeine
fi
# Restore previous value for AC suspend timeout if script
# was interrupted.
if [ -f ~/.config/audiocaffeine/acsuspend ]; then
echo "Restoring previous AC suspend timeout."
read acsuspendtime < ~/.config/audiocaffeine/acsuspend
gsettings set $actimeoutid $acsuspendtime
echo "Removing temporary file ~/.config/audiocaffeine/acsuspend"
rm ~/.config/audiocaffeine/acsuspend
fi
# Restore previous value for battery suspend timeout if script
# was interrupted.
if [ -f ~/.config/audiocaffeine/battsuspend ]; then
echo "Restoring previous battery suspend timeout."
read battsuspendtime < ~/.config/audiocaffeine/battsuspend
gsettings set $batttimeoutid $battsuspendtime
echo "Removing temporary file ~/.config/audiocaffeine/battsuspend"
rm ~/.config/audiocaffeine/battsuspend
fi
# Start main loop to check if audio is playing
while true; do
# Use pactl to detect if there are any running audio sources.
if pactl list | grep -q "State: RUNNING"; then
echo "Audio detected."
# If AC timeout was not previously saved, then save it.
if [ ! -f ~/.config/audiocaffeine/acsuspend ]; then
echo "Saving current AC suspend timeout."
gsettings get $actimeoutid > ~/.config/audiocaffeine/acsuspend
fi
# If battery timeout was not previously saved, then save it.
if [ ! -f ~/.config/audiocaffeine/battsuspend ]; then
echo "Saving current battery suspend timeout."
gsettings get $batttimeoutid > ~/.config/audiocaffeine/battsuspend
fi
# Set the suspend timouts to Never using gsettings.
echo "Changing suspend timeouts."
gsettings set $actimeoutid $disablevalue
gsettings set $batttimeoutid $disablevalue
else
echo "No audio detected."
# Restore previous value for AC suspend timeout and delete the
# temporary file storing it.
if [ -f ~/.config/audiocaffeine/acsuspend ]; then
echo "Restoring previous AC suspend timeout."
read acsuspendtime < ~/.config/audiocaffeine/acsuspend
gsettings set $actimeoutid $acsuspendtime
echo "Removing temporary file ~/.config/audiocaffeine/acsuspend"
rm ~/.config/audiocaffeine/acsuspend
fi
# Restore previous value for battery suspend timeout and delete the
# temporary file storing it.
if [ -f ~/.config/audiocaffeine/battsuspend ]; then
echo "Restoring previous battery suspend timeout."
read battsuspendtime < ~/.config/audiocaffeine/battsuspend
gsettings set $batttimeoutid $battsuspendtime
echo "Removing temporary file ~/.config/audiocaffeine/battsuspend"
rm ~/.config/audiocaffeine/battsuspend
fi
fi
# Pause the script for 60 seconds before doing the loop again.
sleep 60s
done