csd-power-watchdog.sh

#!/bin/sh

# csd-power-watchdog
#
# Description: check if csd-power is quiet and restart if it is
# Author: Daan Sprenkels <hello@dsprenkels.com>
#
# On my system, csd-power often locks up when closing the lid of my laptop
# when an external monitor is attached. This script is a watchdog to kick
# the csd-power daemon if it looks unresponsive.
# Every now and then minutes, csd-power reports the current battery level
# to the DBus. This script monitors the bus and restarts csd-power is it
# has been silent for more than 4 minutes.


systemd-cat -t csd-power-watchdog <<EOF
Starting csd-power-watchdog for user $(whoami)...
EOF

while true; do
    # Listen for messages on the DBus
    TEMPFILE="$(mktemp /tmp/csd-power-watchdog.XXXXXXXX.txt)"
    dbus-monitor --session "type=signal,path=/org/cinnamon/SettingsDaemon/Power" >"$TEMPFILE" &
    MONPID="$!"

    sleep "245" # Wait a little more than 4 minutes
    kill "$MONPID"

    # We've listened for some time, check if csd-power has been active
    grep --quiet -E '\bpath=/org/cinnamon/SettingsDaemon/Power\b' "$TEMPFILE"
    if [ "$?" != 0 ]; then
	systemd-cat -t csd-power-watchdog <<EOF
csd-power has been quiet for more than 4 minutes, restarting...
EOF
        killall --quiet --user "$(whoami)" csd-power
        sleep 1 # Allow for graceful exit of the process
        killall --quiet --user "$(whoami)" -SIGKILL csd-power
        /usr/lib/cinnamon-settings-daemon/csd-power &
        disown
    fi
    rm "$TEMPFILE"
done

The bug does not seem to occur anymore. I am locally disabling this script.