upgrade :^)

Makefile

@@ -2,6 +2,8 @@ VERSION = 0.0.1
 PREFIX = /usr/local
 MANPREFIX = ${PREFIX}/share/man
 
+all: undervolt powersave
+
 undervolt: undervolt.sh
 powersave: powersave.sh
 

powersave.sh

@@ -1,8 +1,46 @@
 #!/bin/sh
 
-GOVERNOR='powersave'
-if [ "$1" ]; then
-	GOVERNOR="$1"
-fi
+GOVERNOR="powersave"
+apply_lm=true
 
-echo "$GOVERNOR" | sudo tee /sys/devices/system/cpu/cpu*/cpufreq/scaling_governor
+while getopts 'hopPg:' opt; do
+	case opt in
+		'h')
+			echo "Usage: powersave [-hopP] [-g governor]"
+			echo "    -h  this message"
+			echo "    -o  set governor to ondemand and activate laptop mode"
+			echo "    -p  set governor to powersave and activate laptop mode (default)"
+			echo "    -P  set governor to performance"
+			echo "    -g governor  set governor to the specified value"
+			exit 0
+			;;
+		'o')
+			GOVERNOR=ondemand
+			apply_lm=true
+			;;
+		'p')
+			GOVERNOR=powersave
+			apply_lm=true
+			;;
+		'P')
+			GOVERNOR=performance
+			apply_lm=false
+			;;
+		'g')
+			GOVERNOR=$OPTARG
+			apply_lm=false
+			;;
+	esac
+		''
+done
+shift $((OPTIND-1))
+
+echo "$GOVERNOR" > /sys/devices/system/cpu/cpu*/cpufreq/scaling_governor
+
+if $apply_lm; then
+	# "5 is a sensible time" https://www.kernel.org/doc/Documentation/laptops/laptop-mode.txt
+	sysctl 'vm.laptop_mode=5'
+else
+	# disable laptop_mode
+	sysctl 'vm.laptop_mode=0'
+fi

undervolt.sh

@@ -4,7 +4,6 @@
 # TODO: check if all the required tools are available
 
 CPUS="$(nproc)"
-GOVERNOR='ondemand'
 # Out your wanted values here
 CORE_SPEED_HZ_P0=2300000  # 2.30GHz slightly over the base (2.10GHz)
 CORE_SPEED_HZ_P1=1450000  # 1.45GHz
@@ -26,12 +25,6 @@ MAX_TEMP_C=85
 # enable cpu frequency boost if available
 echo 1 > /sys/devices/system/cpu/cpufreq/boost
 
-# set governor
-for c in $(seq 0 $((CPUS-1)))
-do
-	echo $GOVERNOR > /sys/devices/system/cpu/"cpu$c"/cpufreq/scaling_governor
-done
-
 #
 # set voltage
 # ===========