#! /bin/bash
# i8ktemp
# count_zero 2007
# bash script to control the fan speed of inspiron notebooks
# depends on i8k kernel module and i8kutils


# lo fan will turn off as temp drops below this temp
lofanoff=50
# lo fan will turn on if temp rises above this temp
lofanon=55
# hi fan turns to lo fan if temp drops below this temp
hifanoff=60
# hi fan turn on above this temp
hifanon=70
# how often to poll the temp in seconds
interval=5


while true
do
	temp=`i8kctl | awk '{ print $4 }'`
	rpm=`i8kctl | awk '{ print $7 }'`
	#if temp < $lofanoff (fan always off)
	if [[ "$temp" -lt "$lofanoff" ]]
		then i8kctl fan 0 0
	#if temp $lofanoff - $lofanon
	elif [[ "$temp" -gt "$lofanoff" ]] && [[ "$temp" -lt "$lofanon" ]]
		then
		#continue with no fan if lo fan not already on
		if [[ "$rpm" -eq 0 ]]
			then i8kctl fan 0 0
		#continue with lo fan if lo fan already on
		elif [[ "$rpm" -lt 100000 ]]
			then i8kctl fan 1 1
		fi
	#if temp $lofanon - $hifanoff
	elif [[ "$temp" -gt "$lofanon" ]] && [[ "$temp" -lt "$hifanoff" ]]
		then i8kctl fan 1 1
	#if temp $hifanoff - $hifanon
	elif [[ "$temp" -gt "$hifanoff" ]] && [[ "$temp" -lt "$hifanon" ]]
		then
		#continue with lo fan if hi fan not already on
		if [[ "$rpm" -lt 100000 ]]
			then i8kctl fan 1 1
		#continue with hi fan if hi fan already on
		elif [[ "$rpm" -gt 100000 ]]
			then i8kctl fan 2 2
		fi
	#if temp > $hifanon (hi fan always on)
	elif [[ "$temp" -gt "$hifanon" ]]
		then i8kctl fan 2 2
	fi

sleep $interval
done