vega-fan-control

#!/bin/bash
#
# Script to control AMD Vega card fans.
#
#  authored-by: Aaron Echols
#        email: atechols at gmail dot com
#
#  NOTES:
#
#  This script has been released under the GNU GENERAL PUBLIC LICENSE.
#  Please contribute to the upstream author at:
#  https://github.com/dasunsrule32/radeon-scripts
#
#  Install Instructions:
#
#  https://github.com/dasunsrule32/radeon-scripts/blob/master/systemd/INSTALL-vega-fan-control.md
#

# Variables:
# ----------
DEBUG=0 # Enable (1) or Disable (0) DEBUG.
AMDSYSFILE="power_dpm_force_performance_level" # AMD SYSFS file to search for.
SYSPATH=$(awk '{print}' <<< `find /sys/devices -name $AMDSYSFILE -type f -exec dirname {} \;`) # Autodetect SYSFS path.
HWMONPATH="hwmon/hwmon0"
KERNELVER=$(awk -F. '{printf("%d%02d\n", $1, $2)}' <<< `uname -r`) # Get kernel version.
KERNELREQ="415" # Minimum required kernel version for script.

# Functions:
# ----------
# Echo a string value that is passed
echo_text() {
   echo -e >&2 "$@";
}

# Restore default PWM settings on exit:
pwm_default() {
   echo_text "\nRestoring PWM defaults"
   echo "2" > "$SYSPATH/$HWMONPATH/pwm1_enable"
   if [ $DEBUG = 1 ]; then
      cat $SYSPATH/$HWMONPATH/pwm1_enable
   fi
}

# Main body:
# ----------
# Check if root:
if [[ $EUID -ne 0 ]]; then
   echo_text "You need to be root to run this script..."
   exit 1
fi

# Check if kernel version is new enough:
if [ $KERNELVER -lt $KERNELREQ ]; then
   echo_text "Kernel is too old, exiting..."
   exit 2
else
   echo_text "Kernel requirements met, continuing..."
fi

# Set PWM to manual control:
echo "1" > "$SYSPATH/$HWMONPATH/pwm1_enable"

# On exit set default fan controls:
trap "pwm_default" EXIT 
if [ $DEBUG -eq 1 ]; then
   echo_text "Hit ctrl-c to exit..."
fi

while :
do
   # Get GPU temperatures:
   GPUTEMP=`awk '{print $1/(1000)}' $SYSPATH/$HWMONPATH/temp1_input`

   # Set RPM based on temperature range:
   if [ "$GPUTEMP" -ge "20" ] && [ "$GPUTEMP" -le "24" ]; then
      FANRPM=400
   elif [ "$GPUTEMP" -ge "25" ] && [ "$GPUTEMP" -le "29" ]; then
      FANRPM=600
   elif [ "$GPUTEMP" -ge "30" ] && [ "$GPUTEMP" -le "34" ]; then
      FANRPM=800
   elif [ "$GPUTEMP" -ge "35" ] && [ "$GPUTEMP" -le "39" ]; then
      FANRPM=1200
   elif [ "$GPUTEMP" -ge "40" ] && [ "$GPUTEMP" -le "44" ]; then
      FANRPM=1600
   elif [ "$GPUTEMP" -ge "44" ] && [ "$GPUTEMP" -le "49" ]; then
      FANRPM=1800
   elif [ "$GPUTEMP" -ge "50" ] && [ "$GPUTEMP" -le "54" ]; then
      FANRPM=2000
   elif [ "$GPUTEMP" -ge "55" ] && [ "$GPUTEMP" -le "59" ]; then
      FANRPM=2200
   elif [ "$GPUTEMP" -ge "60" ] && [ "$GPUTEMP" -le "64" ]; then
      FANRPM=2400
   elif [ "$GPUTEMP" -ge "65" ] && [ "$GPUTEMP" -le "69" ]; then
      FANRPM=2600
   elif [ "$GPUTEMP" -ge "70" ] && [ "$GPUTEMP" -le "74" ]; then
      FANRPM=2800
   elif [ "$GPUTEMP" -ge "75" ] && [ "$GPUTEMP" -le "79" ]; then
      FANRPM=3000
   elif [ "$GPUTEMP" -ge "80" ] && [ "$GPUTEMP" -le "86" ]; then
      FANRPM=3200
   fi

   # Set the RPM in the sys device for AMD fancontrol:
   echo "$FANRPM" > "$SYSPATH/$HWMONPATH/fan1_target"

   # Wait 2 seconds to re-evaluate temperatures:
   sleep 2s

   # Debug output:
   if [ $DEBUG -eq 1 ]; then
      echo_text "GPU Temp: $GPUTEMP"
      echo_text " Fan RPM: $FANRPM"
   fi
   # Workaround for issue: https://github.com/dasunsrule32/radeon-scripts/issues/3
   GET_PWM1=`cat $SYSPATH/$HWMONPATH/pwm1_enable`
   if [ "$GET_PWM1" -eq 2 ]; then
      echo "1" > "$SYSPATH/$HWMONPATH/pwm1_enable"
      echo_text "\nRe-enabling fan control"
   fi
done