From df4319684282b4eeb2c5d3ee0a2ac9bb14fcd29c Mon Sep 17 00:00:00 2001
From: Aaron LI <aly@aaronly.me>
Date: Wed, 14 Jun 2017 22:58:26 +0800
Subject: Add linux/nvidia-fan-control.sh

Start Xorg and manually control NVIDIA GPU fan using `nvidia-settings`.

WARNING:
* After enabled manual fan control, and GPU performance level is
  restricted to the lowest `P8`, for unknown reason!
* Disabled manual fan control by setting `GPUFanControlState=0` cannot
  make the GPU fan automatically controlled, for unknown reason!
---
 linux/nvidia-fan-control.sh | 200 ++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 200 insertions(+)
 create mode 100755 linux/nvidia-fan-control.sh

diff --git a/linux/nvidia-fan-control.sh b/linux/nvidia-fan-control.sh
new file mode 100755
index 0000000..60df143
--- /dev/null
+++ b/linux/nvidia-fan-control.sh
@@ -0,0 +1,200 @@
+#!/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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