风扇
TOC
转速控制
默认是最高转速的，需要自己调整。
使用命令 pwmconfig 和 sensors。
pwmconfig 生成 /etc/fancontrol 文件，执行 systemctl start fancontrol 生效。
# 查看是否检测到风扇
$ sensors
nct6779-isa-0a20
Adapter: ISA adapter
Vcore: 296.00 mV (min = +0.00 V, max = +1.74 V)
in1: 0.00 V (min = +0.00 V, max = +0.00 V)
AVCC: 3.36 V (min = +0.00 V, max = +0.00 V) ALARM
+3.3V: 3.36 V (min = +0.00 V, max = +0.00 V) ALARM
in4: 0.00 V (min = +0.00 V, max = +0.00 V)
in5: 0.00 V (min = +0.00 V, max = +0.00 V)
in6: 2.04 V (min = +0.00 V, max = +0.00 V) ALARM
3VSB: 3.36 V (min = +0.00 V, max = +0.00 V) ALARM
Vbat: 3.28 V (min = +0.00 V, max = +0.00 V) ALARM
in9: 1.06 V (min = +0.00 V, max = +0.00 V) ALARM
in10: 152.00 mV (min = +0.00 V, max = +0.00 V) ALARM
in11: 128.00 mV (min = +0.00 V, max = +0.00 V) ALARM
in12: 2.04 V (min = +0.00 V, max = +0.00 V) ALARM
in13: 1.24 V (min = +0.00 V, max = +0.00 V) ALARM
in14: 160.00 mV (min = +0.00 V, max = +0.00 V) ALARM
fan1: 0 RPM (min = 0 RPM)
fan2: 690 RPM (min = 0 RPM)
fan3: 0 RPM (min = 0 RPM)
fan4: 0 RPM (min = 0 RPM)
fan5: 0 RPM (min = 0 RPM)
SYSTIN: +44.0°C (high = +0.0°C, hyst = +0.0°C) ALARM sensor = thermal diode
CPUTIN: -128.0°C (high = +80.0°C, hyst = +75.0°C) sensor = CPU diode
AUXTIN0: -61.5°C sensor = thermistor
AUXTIN1: +102.0°C sensor = thermistor
AUXTIN2: +108.0°C sensor = thermistor
AUXTIN3: +22.0°C sensor = thermal diode
PECI Agent 1: +0.0°C
PECI Agent 0: +57.0°C
PCH_CHIP_CPU_MAX_TEMP: +0.0°C
PCH_CHIP_TEMP: +0.0°C
intrusion0: OK
intrusion1: ALARM
beep_enable: disabled
# 如果没有检测到风扇，执行这个命令来检查，根据检查结果做处理
sensors-detect
# 查看 CPU 的温度，可知 CPU 的高温临界值
$ sensors
coretemp-isa-0000
Adapter: ISA adapter
Package id 0: +36.0°C (high = +60.0°C, crit = +70.0°C)
Core 0: +27.0°C (high = +60.0°C, crit = +70.0°C)
Core 1: +30.0°C (high = +60.0°C, crit = +70.0°C)
Core 2: +26.0°C (high = +60.0°C, crit = +70.0°C)
Core 3: +30.0°C (high = +60.0°C, crit = +70.0°C)
Core 4: +26.0°C (high = +60.0°C, crit = +70.0°C)
Core 5: +28.0°C (high = +60.0°C, crit = +70.0°C)
Core 6: +30.0°C (high = +60.0°C, crit = +70.0°C)
Core 7: +31.0°C (high = +60.0°C, crit = +70.0°C)
# temp 数能对应上 sensors 的数量
$ ls /sys/class/hwmon/hwmon1
device temp1_label temp3_crit temp4_input temp5_max temp7_crit_alarm temp8_label uevent
name temp1_max temp3_crit_alarm temp4_label temp6_crit temp7_input temp8_max
power temp2_crit temp3_input temp4_max temp6_crit_alarm temp7_label temp9_crit
subsystem temp2_crit_alarm temp3_label temp5_crit temp6_input temp7_max temp9_crit_alarm
temp1_crit temp2_input temp3_max temp5_crit_alarm temp6_label temp8_crit temp9_input
temp1_crit_alarm temp2_label temp4_crit temp5_input temp6_max temp8_crit_alarm temp9_label
temp1_input temp2_max temp4_crit_alarm temp5_label temp7_crit temp8_input temp9_max
# 查看 Package id 0 的温度，即 36.0°C
$ cat /sys/class/hwmon/hwmon1/temp1_input
36000
# 查看 Package id 0 Core 0 的温度，即 26.0°C
cat /sys/class/hwmon/hwmon1/temp2_input
26000
/etc/fancontrol
# Configuration file generated by pwmconfig, changes will be lost
INTERVAL=10
DEVPATH=hwmon1=devices/platform/nct6775.2592 hwmon2=devices/platform/coretemp.0
DEVNAME=hwmon1=nct6779 hwmon2=coretemp
FCTEMPS=hwmon1/pwm2=hwmon2/temp1_input
FCFANS=hwmon1/pwm2=hwmon1/fan2_input
# The temperature (°C) at which to SHUT OFF the CPU fan. Efficient CPUs often will not need a fan while idling. Be sure to set this to a temperature that you know is safe. Setting this to 0 is not recommended and may ruin your hardware!
MINTEMP=hwmon1/pwm2=30
# The temperature (°C) at which to spin the fan at its MAXIMUM speed. This should be probably be set to perhaps 10 or 20 degrees (°C) below your CPU's critical/shutdown temperature. Setting it closer to MINTEMP will result in higher fan speeds overall.
MAXTEMP=hwmon1/pwm2=60
# The PWM value at which your fan starts to spin again. This is often a higher value than MINSTOP as more voltage is required to overcome inertia.
MINSTART=hwmon1/pwm2=120
# The PWM value at which your fan stops spinning. Each fan is a little different. Power tweakers can echo different values (between 0 and 255) to /sys/class/hwmon/hwmon0/device/pwm1 and then watch the CPU fan. When the CPU fan stops, use this value.
MINSTOP=hwmon1/pwm2=0
# The PWM value to use when the temperature is over MAXTEMP. If this value isn't defined, it defaults to 255 (full speed).
MAXPWM=hwmon1/pwm2=255
其中 DEVPATH 可以在 /sys/ 目录下找到，比如 /sys/devices/platform/nct6775.2592 和 /sys/devices/platform/coretemp.0。DEVPATH 的填值不要包含 /sys/。
系统重启后，配置过期
系统重启后 hwmon 的加载顺序可能会变，导致 fancontrol 的启动检查报下面的错。
Configuration appears to be outdated, please run pwmconfig again
具体可以查看 /usr/sbin/fancontrol 里的ValidateDevices 函数内容。
- https://github.com/lm-sensors/lm-sensors/issues/227
- https://wiki.archlinux.org/title/Fan_speed_control#Device_paths_have_changed_in_/etc/fancontrol