set the nvidia fan speed to a custom value (optionally derived from the current temperature)

nvidia-customfan

#!/bin/zsh

if [ "_$1" = "_-auto" ]
  then nvidia-settings -a '[gpu:0]/GPUFanControlState=0'

elif [ "_$1" = "_-temp" ]
  then nvidia-settings -a '[gpu:0]/GPUFanControlState=1'
  temp=$(nvidia-settings -tq '[gpu:0]/GPUCoreTemp')
  target=$((($temp*$2)/100))
  if [ ! "_$3" = "_" ]
    then zmodload zsh/mathfunc
    target=$(( int( ( $2 * ($temp * $temp) ) + ( $3 * $temp ) + $4 ) ))
  fi
  [ $target -gt 100 ] && target=100
  [ $target -lt 0 ] && target=0
  nvidia-settings -a '[fan:0]/GPUTargetFanSpeed='$target

elif [ "_$1" = "_-fix" ]
  then nvidia-settings -a '[gpu:0]/GPUFanControlState=1'
  nvidia-settings -a '[fan:0]/GPUTargetFanSpeed='$2

else
cat <<END
USAGE: $0 <mode> [...]
Modes:
  -temp {<percent>|<a> <b> <c>}
    using <percent>:
      sets the target fan speed to the current temperature (in C) multiplied by the <percent>age.
      sane values: around 150
    using <a> <b> <c>:
      sets the target fan speed to <a>*temp^2 + <b>*temp + c, with temp being the current temperature in C
  -fix <percent>
    sets the target fan speed to the <percentage>
    sane values: 0..100
  -auto
    reenables the driver's autothrottling
END
exit 1
fi