Auto Update for power-profiles-daemon

auto_profile

#!/bin/bash

dbus-monitor --system "type='signal',path='/org/freedesktop/UPower/devices/battery_BAT0',member='PropertiesChanged'" | while read LINE; do
    echo ${LINE} | grep battery_BAT0 | grep -q PropertiesChanged
    if [ $? -eq 0 ]; then
        BATT_STAT=$(dbus-send --print-reply=literal --system --dest=org.freedesktop.UPower /org/freedesktop/UPower/devices/battery_BAT0 org.freedesktop.DBus.Properties.Get  string:org.freedesktop.UPower.Device string:State | awk '{ print $3; }')
        if [ $BATT_STAT -eq 1 ] || [ $BATT_STAT -eq 4 ]; then
            LEVEL=$(tuned-adm list | grep -q throughput-performance && echo "throughput-performance" || echo "balanced")
        elif [ $BATT_STAT -eq 5 ]; then
            LEVEL="balanced"
        else
            LEVEL="powersave"
        fi
	if [[ "$(tuned-adm active | sed 's,.*: ,,')" != "$LEVEL" ]] ; then
		echo "Changing power level to ${LEVEL}"
		tuned-adm profile $LEVEL
		[[ $? -ne 0 ]] && echo "Could not change power level to ${LEVEL}!"
        fi
    fi
done

Where do you place this script?

/usr/local/bin would be a good place, then have systemd call it from there via service. It logs to the system log that way.

Assuming the script is executable in /usr/local/bin, here's a working systemd service file for it:

[Unit]
Description=Automatically Adjust Power Profile
After=upower.service

[Service]
Type=simple
ExecStart=/usr/local/bin/auto_profile

[Install]
WantedBy=multi-user.target

Put that in /etc/systemd/system/auto-power-profile.service then sudo systemctl daemon-reload && sudo systemctl enable --now auto-power-profile

From there, logs for it should show up in journald whenever you have a power status change and it should persist automatically on reboots.

Just for any new users, the path referred to by ExecStart should be the name of the bash file, so if you named it "auto-profile-update.sh" (as stated at the top), then it should be /usr/local/bin/auto-profile-update.sh .

Also, make sure to give auto-profile-update.sh (or whatever you've called it) executable permissions by running the command
chmod a+x <file-name-here.sh> in /usr/local/bin

Thanks for that. I should note that this script is probably no longer useful For Fedora users as of Fedora 41 since Fedora has since moved to upower by default.

I just updated this to work for Fedora 41 via tuned. Use the previous version if you're on Fedora 40 or otherwise using the powerprofiles daemon. I also updated the name to match the systemd service example. It'll also spam the logs less since it won't output anything if the level isn't changing now.

Note that tuned also has a "recommended" and "auto_profile" mode already, so you might consider just using the existing tuned methods. If you specifically want these modes based on the battery/charging status, then this script should still be useful.