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#!/usr/bin/env bash
set -euo pipefail
require_root() {
if [[ ${EUID} -ne 0 ]]; then
exec sudo -- "$0" "$@"
fi
}
write_sysfs() {
local path="$1"
local value="$2"
if [[ -w "$path" ]]; then
printf '%s' "$value" >"$path"
return 0
fi
return 1
}
require_root "$@"
changed=0
# Intel P-State turbo control
if [[ -e /sys/devices/system/cpu/intel_pstate/no_turbo ]]; then
if write_sysfs /sys/devices/system/cpu/intel_pstate/no_turbo 1; then
changed=1
fi
fi
# Generic cpufreq boost control (AMD/Intel)
if [[ -e /sys/devices/system/cpu/cpufreq/boost ]]; then
if write_sysfs /sys/devices/system/cpu/cpufreq/boost 0; then
changed=1
fi
fi
# Prefer a quieter governor if available
for gov in /sys/devices/system/cpu/cpu*/cpufreq/scaling_governor; do
if [[ -w "$gov" ]]; then
current=$(cat "$gov")
if [[ "$current" != "powersave" ]] && grep -q powersave "${gov%/*}/scaling_available_governors"; then
printf '%s' powersave >"$gov"
changed=1
fi
fi
done
# Lower energy/performance preference if supported
for epp in /sys/devices/system/cpu/cpu*/cpufreq/energy_performance_preference; do
if [[ -w "$epp" ]]; then
printf '%s' power >"$epp" 2>/dev/null || true
changed=1
fi
done
if [[ $changed -eq 1 ]]; then
echo "CPU turbo/boost disabled and power-saving preferences applied."
exit 0
fi
echo "No writable turbo/boost controls found. Check kernel driver support."
exit 1
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