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57 lines
1.4 KiB
Plaintext
57 lines
1.4 KiB
Plaintext
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#!/usr/bin/env bash
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set -euo pipefail
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if [ "$EUID" -ne 0 ]; then
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echo "You must run this script as root"
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exit 1
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fi
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BAT=$(echo /sys/class/power_supply/BAT*) # only supports single-battery systems
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BAT_STATUS="$BAT/status"
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BAT_CAP="$BAT/capacity"
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OVERRIDE_FLAG="/tmp/power-monitor-override"
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POWER_SAVE_PERCENT=50 # Enter power-save mode if on bat and below this capacity
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HAS_PERFORMANCE="$(powerprofilesctl list | grep "performance" || true)" # the || true ignores grep failing with non-zero code
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# monitor loop
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prev=0
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while true; do
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# check if override is set
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if [ -f "$OVERRIDE_FLAG" ]; then
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echo "Override flag set, waiting for release"
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inotifywait -qq "$OVERRIDE_FLAG"
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continue
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fi
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# read the current state
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status="$(cat "$BAT_STATUS")"
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capacity="$(cat "$BAT_CAP")"
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if [[ $status == "Discharging" ]]; then
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if [[ $capacity -le $POWER_SAVE_PERCENT ]]; then
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profile="power-saver"
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else
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profile="balanced"
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fi
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else
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if [[ -n $HAS_PERFORMANCE ]]; then
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profile="performance"
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else
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profile="balanced"
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fi
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fi
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# Set the new profile
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if [[ "$profile" != "$prev" ]]; then
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echo -en "Setting power profile to ${profile}\n"
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powerprofilesctl set $profile
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prev=$profile
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fi
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# wait for changes in status or capacity files
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# i.e. for the next power change event
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inotifywait -qq "$BAT_STATUS" "$BAT_CAP"
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done
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