Auto Fan Boost

With help of AI I created a script to control fan boost based on cpu/gpu temperatures:

#!/usr/bin/env bash

CONFIG="auto_fan.conf"
CHECK_INTERVAL=5

declare -a CPU_RULES GPU_RULES
LAST_CPU_BOOST=""
LAST_GPU_BOOST=""

HYSTERESIS=3

LAST_CPU_TEMP=""
LAST_GPU_TEMP=""

# Load config
load_config() {
	local section=""
	while IFS= read -r line; do
		line=$(echo "$line" | sed 's/[[:space:]]//g')
		[[ -z "$line" || "$line" =~ ^# ]] && continue

		if [[ "$line" =~ ^\[(.*)\]$ ]]; then
			section="${BASH_REMATCH[1]}"
			continue
		fi

		if [[ "$line" =~ ^([0-9]+)-([0-9]+)=([0-9]+)$ ]]; then
			rule="${BASH_REMATCH[1]}-${BASH_REMATCH[2]}=${BASH_REMATCH[3]}"
			if [[ "$section" == "CPU" ]]; then
				CPU_RULES+=("$rule")
			elif [[ "$section" == "GPU" ]]; then
				GPU_RULES+=("$rule")
			fi
		fi
	done < "$CONFIG"
}

# Match temperature to a rule
match_boost() {
	local TEMP=$1
	local -n RULES=$2

	for rule in "${RULES[@]}"; do
		IFS='-=' read -r MIN MAX BOOST <<< "$rule"
		if (( TEMP >= MIN && TEMP <= MAX )); then
			echo "$BOOST"
			return
		fi
	done
	echo ""
}

check_g_mode() {
	awcc qm 2>/dev/null | grep -iq 'G-Mode'
}

get_temp_cpu() {
	sensors dell_ddv-virtual-0 | grep 'CPU:' | sed 's/\s\+/ /g' | cut -f 2 -d ' ' | tr -d '+' | sed 's/\..*//'
}

get_temp_gpu() {
	sensors dell_ddv-virtual-0 | grep 'Video:' | sed 's/\s\+/ /g' | cut -f 2 -d ' ' | tr -d '+' | sed 's/\..*//'
}

load_config

CLEANED=''

# Cleanup function to reset fan boost
cleanup() {
	[[ -z "$CLEANED" ]] || return
	CLEANED="YES"

	if ! check_g_mode; then
		echo "Exiting: resetting fan boosts to 0"
		awcc scb 0
		awcc sgb 0
	else
		echo "Exiting in G-Mode: leaving boosts unchanged"
	fi
	exit 0
}

# Trap script termination signals
trap cleanup SIGINT SIGTERM EXIT

while true; do
	if check_g_mode; then
		LAST_CPU_BOOST=""
		LAST_GPU_BOOST=""
		sleep "$CHECK_INTERVAL"
		continue
	fi

	CPU_TEMP=$(get_temp_cpu)
	GPU_TEMP=$(get_temp_gpu)

	[[ -z "$CPU_TEMP" || -z "$GPU_TEMP" ]] && sleep "$CHECK_INTERVAL" && continue

	CPU_BOOST=$(match_boost "$CPU_TEMP" CPU_RULES)
	GPU_BOOST=$(match_boost "$GPU_TEMP" GPU_RULES)

	if [[ -n "$CPU_BOOST" && "$CPU_BOOST" != "$LAST_CPU_BOOST" ]]; then
		if [[ -z "$LAST_CPU_TEMP" || $(( CPU_TEMP > LAST_CPU_TEMP + HYSTERESIS || CPU_TEMP < LAST_CPU_TEMP - HYSTERESIS )) -ne 0 ]]; then
			echo cpu "$CPU_TEMP $CPU_BOOST"
			awcc scb "$CPU_BOOST"
			LAST_CPU_BOOST="$CPU_BOOST"
			LAST_CPU_TEMP="$CPU_TEMP"
		fi
	fi

	if [[ -n "$GPU_BOOST" && "$GPU_BOOST" != "$LAST_GPU_BOOST" ]]; then
		if [[ -z "$LAST_GPU_TEMP" || $(( GPU_TEMP > LAST_GPU_TEMP + HYSTERESIS || GPU_TEMP < LAST_GPU_TEMP - HYSTERESIS )) -ne 0 ]]; then
			echo gpu "$GPU_TEMP $GPU_BOOST"
			awcc sgb "$GPU_BOOST"
			LAST_GPU_BOOST="$GPU_BOOST"
			LAST_GPU_TEMP="$GPU_TEMP"
		fi
	fi

	sleep "$CHECK_INTERVAL"
done

auto_fan.conf:

[CPU]
0-39=0
40-49=20
50-59=40
60-69=60
70-79=80
80-100=100

[GPU]
0-39=0
40-49=20
50-59=40
60-69=60
70-79=80
80-100=100

I don't make a pull request because I want to write it in C, but have no enough time right now.
Just wanted to share this script, and maybe someone will have a time to rewrite in C or review the code 🙂.
Would be nice to have a systemd unit with fan management.
The ChatGPT conversation: https://chatgpt.com/share/6851194a-5000-8013-bfb7-a78ea86cdc30

[tr1xem]

Looks nice I would add it in snippets

[tr1xem]

Weirdly for me fans are auto managed, if temps goes higher fan boost itself without and manual systemd service

[GasparVardanyan]

It's managed from bios, but it's not good enough 🙂

I've created a new branch and I'm planning to rewrite this in C.

[GasparVardanyan]

The current workarounds seem limited (only 3 boost levels for example) or dangerous (lm-sensors can damage the hardware with wrong usage): https://wiki.archlinux.org/title/Fan_speed_control#Dell_laptops

autoboost will be safe and flexible, just an automation of awcc boost control functionality.

[tr1xem]

It's managed from bios, but it's not good enough 🙂

I've created a new branch and I'm planning to rewrite this in C.

Well Thats awesome i could add cpu and gpu temps and fans rpm fetching in awcc itself as there are acpi calls for them too

[GasparVardanyan]

That's great! I think my progress will be slow for the C part, I'm busy now, you can wait until I rewrite this in C and then help with acpi calls. I don't want you to do the acpi part and wait for me ))

I've also added 10s delay before downboosting. Seems it's ready to be rewritten in C. This is what goings on: https://chatgpt.com/share/6851194a-5000-8013-bfb7-a78ea86cdc30

[GasparVardanyan]

I've added a systemd unit file, can you try and it? Does the current algorithm work well?

[tr1xem]

@GasparVardanyan could you add a dry run flag? which would only show what changes it would make ? not actually execute them

[GasparVardanyan]

Done. Now you can run script like sudo ./awcc_autoboost.sh dry. It will print the awcc scb and sgb commands instead of actually running them. I can't avoid sudo because it needs for qm. Also logging to /var/run/awcc is kept running, I think you don't have problem with it.
I'm can create a separate script which will assume always performance mode and work without sudo, just printing commands it wants to run.
I'm already working on the C part.

[GasparVardanyan]

I think it will be cool to give an option in configuration to switch modes too.
For example on 0-50°C temperatures we can use the balanced mode, after 50°C we can use the performance mode and enable the gaming mode after 90°C. What you think?

[GasparVardanyan]

I want to have the full picture what config file will look like to start implementing the basic stuff.

[GasparVardanyan]

We use 0xA1 for "Performance" mode in ACPI calls, but according to kernel.org it's the "Balanced Performance" mode, and there's a separate "Performance" mode 0xA4: https://docs.kernel.org/wmi/devices/alienware-wmi.html
Also the "GMODE replaces PERFORMANCE in G-Series laptops." part looks confusing for me.
Maybe we have to update the thermal profile control ACPI calls? I think we need the "Cool" mode 🙂
@tr1xem

[tr1xem]

Done. Now you can run script like sudo ./awcc_autoboost.sh dry. It will print the awcc scb and sgb commands instead of actually running them. I can't avoid sudo because it needs for qm. Also logging to /var/run/awcc is kept running, I think you don't have problem with it. I'm can create a separate script which will assume always performance mode and work without sudo, just printing commands it wants to run. I'm already working on the C part.

I think a bash daemon would be better than c? cuz its just a serivce right? dosent matter if its c and ig bash would be better as we could skip complexity

[tr1xem]

I want to have the full picture what config file will look like to start implementing the basic stuff.

I was thinking that of too with gui
Custom option would be great too I support that idea