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#!/bin/sh
#
# Copyright (c) 2017 Aaron LI <aly@aaronly.me>
# MIT License
#
# Manually control NVIDIA GPU fan speed using `nvidia-settings` tool.
#
# NOTE:
# Make sure the NVIDIA persistence daemon `nvidia-persistenced` is
# running to keep the GPU context. Otherwise, the applied settings
# will be reverted after X exited.
#
# NOTE:
# This script should work on Debian Linux (testing; amd64)
#
# Credits:
# [1] NVIDIA GPU Coolness
# https://sites.google.com/site/akohlmey/random-hacks/nvidia-gpu-coolness
# [2] http://klein-group.icms.temple.edu/akohlmey/files/set-gpu-fans.tar.gz
#
#
# 2017-06-14
#
set -e
DEBUG=
error() {
echo "ERROR: $@" >&2
}
debug() {
if [ -n "${DEBUG}" ]; then
echo "DEBUG: $@" >&2
fi
}
make_edid() {
# Generate this with: base64 <file>
base64 -d > "$1" <<_EOF_
AP///////wAQrBXwTFRBNS4TAQOANCB47h7Frk80sSYOUFSlSwCBgKlA0QBxTwEBAQEBAQEBKDyA
oHCwI0AwIDYABkQhAAAaAAAA/wBDNTkyTTlCOTVBVEwKAAAA/ABERUxMIFUyNDEwCiAgAAAA/QA4
TB5REQAKICAgICAgAB0=
_EOF_
}
make_xorgconf() {
local xcfg busid edidfile
xcfg="$1"
busid="$2"
edidfile="$3"
cat > "${xcfg}" <<_EOF_
# Simple single screen X server config with fake CRT attached
Section "ServerLayout"
Identifier "Layout0"
Screen 0 "Screen0" 0 0
EndSection
Section "Screen"
Identifier "Screen0"
Device "VideoCard0"
Monitor "Monitor0"
DefaultDepth 24
Option "UseDisplayDevice" "DFP-0"
Option "ConnectedMonitor" "DFP-0"
Option "CustomEDID" "DFP-0:${edidfile}"
Option "Coolbits" "5"
SubSection "Display"
Depth 24
Modes "1024x768"
EndSubSection
EndSection
Section "Files"
ModulePath "/usr/lib/xorg/modules/extensions/nvidia"
ModulePath "/usr/lib/xorg/modules"
EndSection
Section "ServerFlags"
Option "AllowEmptyInput" "on"
Option "Xinerama" "off"
Option "SELinux" "off"
EndSection
Section "Device"
Identifier "VideoCard0"
Driver "nvidia"
Screen 0
Option "UseDisplayDevice" "DFP-0"
Option "ConnectedMonitor" "DFP-0"
Option "CustomEDID" "DFP-0:${edidfile}"
Option "Coolbits" "4"
BusID "${busid}"
EndSection
Section "Monitor"
Identifier "Monitor0"
Vendorname "Dummy Display"
Modelname "1024x768"
EndSection
_EOF_
}
# Convert the PCI ID from format "<bus>:<device>.<func>" to
# "PCI:<bus>:<device>:<func>" for Xorg usage.
make_busid() {
local busid cmd
busid=$(echo "$1" | \
sed -e 's/\([0-f]\+\):\([0-f]\+\)\.\([0-f]\+\)/0x\1 0x\2 0x\3/')
debug make_busid:busid: ${busid}
cmd="printf 'PCI:%d:%d:%d' ${busid}"
debug make_busid:cmd: ${cmd}
busid=$(eval ${cmd})
debug make_busid:busid: ${busid}
echo ${busid}
}
get_gpu_busid() {
local busid=""
for id in $(lspci | grep "VGA compatible controller: NVIDIA" | \
cut -d' ' -f1); do
debug get_gpu_busid:id: ${id}
busid="${busid} $(make_busid ${id})"
done
debug get_gpu_busid:busid: ${busid}
echo "${busid}"
}
# Default display number for Xorg
XD=:0
# Default fan speed (70%)
FANSPEED=70
usage() {
local progname
progname="${0##*/}"
cat <<_EOF_
usage:
${progname} start [ speed_percent ]
Set the GPU fan speed to given percent (default: ${FANSPEED})
${progname} stop
Go back to automatic fan control
_EOF_
}
case "$1" in
start)
shift
FANSPEED=${1:-${FANSPEED}}
CMD="nvidia-settings -a [gpu:0]/GPUFanControlState=1 \
-a [fan:0]/GPUTargetFanSpeed=${FANSPEED}"
;;
stop)
CMD="nvidia-settings -a [gpu:0]/GPUFanControlState=0"
;;
*)
usage
exit 1
;;
esac
EDIDFILE=$(mktemp /tmp/edid-XXXXXXXX.bin)
make_edid ${EDIDFILE}
BUSID=$(get_gpu_busid)
if [ -z "${BUSID}" ]; then
error "no NVIDIA GPU found!" >&2
exit 2
fi
if [ $(id -u) -ne 0 ]; then
error "root privileges required!" >&2
exit 3
fi
for busid in ${BUSID}; do
echo "Set fan speed for NVIDIA GPU: ${busid} ..."
XCFG=$(mktemp /tmp/xorg-XXXXXXXX.conf)
make_xorgconf ${XCFG} ${busid} ${EDIDFILE}
Xorg ${XD} -config ${XCFG} -keeptty >/dev/null &
XPID=$!
sleep 3
echo "Started Xorg at display ${XD} with PID=${XPID}."
env DISPLAY=${XD} ${CMD}
sleep 1
kill -9 ${XPID}
echo "Killed Xorg PID=${XPID}."
rm -f ${XCFG}
done
rm -f ${EDIDFILE}
exit 0
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