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Fails with write only pwm file #338

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symphorien opened this issue Jan 27, 2025 · 1 comment
Open

Fails with write only pwm file #338

symphorien opened this issue Jan 27, 2025 · 1 comment
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bug Something isn't working

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@symphorien
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Describe the bug
on my system the fan speed can be set but not read:

echo 255 > /sys/devices/platform/dell_smm_hwmon/hwmon/hwmon6/pwm1
# works, fan goes full speed
cat /sys/devices/platform/dell_smm_hwmon/hwmon/hwmon6/pwm1
cat: /sys/devices/platform/dell_smm_hwmon/hwmon/hwmon6/pwm1: Invalid argument

fan2go seems to not like this situation at all.

To Reproduce
Steps to reproduce the behavior:

write this configuration file:

fans:
  - id: cpu_fan
    hwmon:
      platform: dell_smm-isa-0000
      rpmChannel: 1
    curve: cpu_curve
sensors:
  - id: cpu_sensor
    hwmon:
      platform: dell_smm-isa-0000
      index: 1
curves:
  - id: cpu_curve
    linear:
      sensor: cpu_sensor
      steps:
        - 50: 0
        - 60: 70
        - 70: 128
        - 80: 255

run fan2go:

#  fan2go -c fan2go.yaml
███████  █████  ███    ██ ██████   ██████   ██████  
██      ██   ██ ████   ██      ██ ██       ██    ██ 
█████   ███████ ██ ██  ██  █████  ██   ███ ██    ██ 
██      ██   ██ ██  ██ ██ ██      ██    ██ ██    ██ 
██      ██   ██ ██   ████ ███████  ██████   ██████  

 INFO  Version: dev
 INFO  Using configuration file at: fan2go.yaml
 WARNING  Cannot read pwm value of cpu_fan
 INFO  Gathering sensor data for cpu_fan...
 INFO  Loading fan curve data for fan 'cpu_fan'...
 WARNING  Fan 'cpu_fan' has not yet been analyzed, starting initialization sequence...
 INFO  Computing pwm map...
 WARNING  Error reading PWM value of fan cpu_fan: read /sys/class/hwmon/hwmon6/pwm1: invalid argument
 WARNING  Error reading PWM value of fan cpu_fan: read /sys/class/hwmon/hwmon6/pwm1: invalid argument
 WARNING  Error reading PWM value of fan cpu_fan: read /sys/class/hwmon/hwmon6/pwm1: invalid argument
 WARNING  Error reading PWM value of fan cpu_fan: read /sys/class/hwmon/hwmon6/pwm1: invalid argument
 WARNING  Error reading PWM value of fan cpu_fan: read /sys/class/hwmon/hwmon6/pwm1: invalid argument
 WARNING  Error reading PWM value of fan cpu_fan: read /sys/class/hwmon/hwmon6/pwm1: invalid argument
 WARNING  Error reading PWM value of fan cpu_fan: read /sys/class/hwmon/hwmon6/pwm1: invalid argument
 WARNING  Error reading PWM value of fan cpu_fan: read /sys/class/hwmon/hwmon6/pwm1: invalid argument
 WARNING  Error reading PWM value of fan cpu_fan: read /sys/class/hwmon/hwmon6/pwm1: invalid argument
 WARNING  Error reading PWM value of fan cpu_fan: read /sys/class/hwmon/hwmon6/pwm1: invalid argument
 WARNING  Error reading PWM value of fan cpu_fan: read /sys/class/hwmon/hwmon6/pwm1: invalid argument
 WARNING  Error reading PWM value of fan cpu_fan: read /sys/class/hwmon/hwmon6/pwm1: invalid argument
 WARNING  Error reading PWM value of fan cpu_fan: read /sys/class/hwmon/hwmon6/pwm1: invalid argument
 WARNING  Error reading PWM value of fan cpu_fan: read /sys/class/hwmon/hwmon6/pwm1: invalid argument
 WARNING  Error reading PWM value of fan cpu_fan: read /sys/class/hwmon/hwmon6/pwm1: invalid argument
 WARNING  Error reading PWM value of fan cpu_fan: read /sys/class/hwmon/hwmon6/pwm1: invalid argument
 WARNING  Error reading PWM value of fan cpu_fan: read /sys/class/hwmon/hwmon6/pwm1: invalid argument
 WARNING  Error reading PWM value of fan cpu_fan: read /sys/class/hwmon/hwmon6/pwm1: invalid argument
 WARNING  Error reading PWM value of fan cpu_fan: read /sys/class/hwmon/hwmon6/pwm1: invalid argument
 WARNING  Error reading PWM value of fan cpu_fan: read /sys/class/hwmon/hwmon6/pwm1: invalid argument
 WARNING  Error reading PWM value of fan cpu_fan: read /sys/class/hwmon/hwmon6/pwm1: invalid argument
 WARNING  Error reading PWM value of fan cpu_fan: read /sys/class/hwmon/hwmon6/pwm1: invalid argument
 WARNING  Error reading PWM value of fan cpu_fan: read /sys/class/hwmon/hwmon6/pwm1: invalid argument
 WARNING  Error reading PWM value of fan cpu_fan: read /sys/class/hwmon/hwmon6/pwm1: invalid argument
 WARNING  Error reading PWM value of fan cpu_fan: read /sys/class/hwmon/hwmon6/pwm1: invalid argument
 WARNING  Error reading PWM value of fan cpu_fan: read /sys/class/hwmon/hwmon6/pwm1: invalid argument
 WARNING  Error reading PWM value of fan cpu_fan: read /sys/class/hwmon/hwmon6/pwm1: invalid argument
 WARNING  Error reading PWM value of fan cpu_fan: read /sys/class/hwmon/hwmon6/pwm1: invalid argument
 WARNING  Error reading PWM value of fan cpu_fan: read /sys/class/hwmon/hwmon6/pwm1: invalid argument
 WARNING  Error reading PWM value of fan cpu_fan: read /sys/class/hwmon/hwmon6/pwm1: invalid argument
 WARNING  Error reading PWM value of fan cpu_fan: read /sys/class/hwmon/hwmon6/pwm1: invalid argument
 WARNING  Error reading PWM value of fan cpu_fan: read /sys/class/hwmon/hwmon6/pwm1: invalid argument
 WARNING  Error reading PWM value of fan cpu_fan: read /sys/class/hwmon/hwmon6/pwm1: invalid argument
 WARNING  Error reading PWM value of fan cpu_fan: read /sys/class/hwmon/hwmon6/pwm1: invalid argument
 WARNING  Error reading PWM value of fan cpu_fan: read /sys/class/hwmon/hwmon6/pwm1: invalid argument
 WARNING  Error reading PWM value of fan cpu_fan: read /sys/class/hwmon/hwmon6/pwm1: invalid argument
 WARNING  Error reading PWM value of fan cpu_fan: read /sys/class/hwmon/hwmon6/pwm1: invalid argument
 WARNING  Error reading PWM value of fan cpu_fan: read /sys/class/hwmon/hwmon6/pwm1: invalid argument
 WARNING  Error reading PWM value of fan cpu_fan: read /sys/class/hwmon/hwmon6/pwm1: invalid argument
 WARNING  Error reading PWM value of fan cpu_fan: read /sys/class/hwmon/hwmon6/pwm1: invalid argument
 WARNING  Error reading PWM value of fan cpu_fan: read /sys/class/hwmon/hwmon6/pwm1: invalid argument
 WARNING  Error reading PWM value of fan cpu_fan: read /sys/class/hwmon/hwmon6/pwm1: invalid argument
 WARNING  Error reading PWM value of fan cpu_fan: read /sys/class/hwmon/hwmon6/pwm1: invalid argument
 WARNING  Error reading PWM value of fan cpu_fan: read /sys/class/hwmon/hwmon6/pwm1: invalid argument
 WARNING  Error reading PWM value of fan cpu_fan: read /sys/class/hwmon/hwmon6/pwm1: invalid argument
 WARNING  Error reading PWM value of fan cpu_fan: read /sys/class/hwmon/hwmon6/pwm1: invalid argument
 WARNING  Error reading PWM value of fan cpu_fan: read /sys/class/hwmon/hwmon6/pwm1: invalid argument
 WARNING  Error reading PWM value of fan cpu_fan: read /sys/class/hwmon/hwmon6/pwm1: invalid argument
 WARNING  Error reading PWM value of fan cpu_fan: read /sys/class/hwmon/hwmon6/pwm1: invalid argument
 WARNING  Error reading PWM value of fan cpu_fan: read /sys/class/hwmon/hwmon6/pwm1: invalid argument
 WARNING  Error reading PWM value of fan cpu_fan: read /sys/class/hwmon/hwmon6/pwm1: invalid argument
 WARNING  Error reading PWM value of fan cpu_fan: read /sys/class/hwmon/hwmon6/pwm1: invalid argument
 WARNING  Error reading PWM value of fan cpu_fan: read /sys/class/hwmon/hwmon6/pwm1: invalid argument
 WARNING  Error reading PWM value of fan cpu_fan: read /sys/class/hwmon/hwmon6/pwm1: invalid argument
 WARNING  Error reading PWM value of fan cpu_fan: read /sys/class/hwmon/hwmon6/pwm1: invalid argument
 WARNING  Error reading PWM value of fan cpu_fan: read /sys/class/hwmon/hwmon6/pwm1: invalid argument
 WARNING  Error reading PWM value of fan cpu_fan: read /sys/class/hwmon/hwmon6/pwm1: invalid argument
 WARNING  Error reading PWM value of fan cpu_fan: read /sys/class/hwmon/hwmon6/pwm1: invalid argument
 WARNING  Error reading PWM value of fan cpu_fan: read /sys/class/hwmon/hwmon6/pwm1: invalid argument
 WARNING  Error reading PWM value of fan cpu_fan: read /sys/class/hwmon/hwmon6/pwm1: invalid argument
 WARNING  Error reading PWM value of fan cpu_fan: read /sys/class/hwmon/hwmon6/pwm1: invalid argument
 WARNING  Error reading PWM value of fan cpu_fan: read /sys/class/hwmon/hwmon6/pwm1: invalid argument
 WARNING  Error reading PWM value of fan cpu_fan: read /sys/class/hwmon/hwmon6/pwm1: invalid argument
 WARNING  Error reading PWM value of fan cpu_fan: read /sys/class/hwmon/hwmon6/pwm1: invalid argument
 WARNING  Error reading PWM value of fan cpu_fan: read /sys/class/hwmon/hwmon6/pwm1: invalid argument
 WARNING  Error reading PWM value of fan cpu_fan: read /sys/class/hwmon/hwmon6/pwm1: invalid argument
 WARNING  Error reading PWM value of fan cpu_fan: read /sys/class/hwmon/hwmon6/pwm1: invalid argument
 WARNING  Error reading PWM value of fan cpu_fan: read /sys/class/hwmon/hwmon6/pwm1: invalid argument
 WARNING  Error reading PWM value of fan cpu_fan: read /sys/class/hwmon/hwmon6/pwm1: invalid argument
 WARNING  Error reading PWM value of fan cpu_fan: read /sys/class/hwmon/hwmon6/pwm1: invalid argument
 WARNING  Error reading PWM value of fan cpu_fan: read /sys/class/hwmon/hwmon6/pwm1: invalid argument
 WARNING  Error reading PWM value of fan cpu_fan: read /sys/class/hwmon/hwmon6/pwm1: invalid argument
 WARNING  Error reading PWM value of fan cpu_fan: read /sys/class/hwmon/hwmon6/pwm1: invalid argument
 WARNING  Error reading PWM value of fan cpu_fan: read /sys/class/hwmon/hwmon6/pwm1: invalid argument
 WARNING  Error reading PWM value of fan cpu_fan: read /sys/class/hwmon/hwmon6/pwm1: invalid argument
 WARNING  Error reading PWM value of fan cpu_fan: read /sys/class/hwmon/hwmon6/pwm1: invalid argument
 WARNING  Error reading PWM value of fan cpu_fan: read /sys/class/hwmon/hwmon6/pwm1: invalid argument
 WARNING  Error reading PWM value of fan cpu_fan: read /sys/class/hwmon/hwmon6/pwm1: invalid argument
 WARNING  Error reading PWM value of fan cpu_fan: read /sys/class/hwmon/hwmon6/pwm1: invalid argument
 WARNING  Error reading PWM value of fan cpu_fan: read /sys/class/hwmon/hwmon6/pwm1: invalid argument
 WARNING  Error reading PWM value of fan cpu_fan: read /sys/class/hwmon/hwmon6/pwm1: invalid argument
 WARNING  Error reading PWM value of fan cpu_fan: read /sys/class/hwmon/hwmon6/pwm1: invalid argument
 WARNING  Error reading PWM value of fan cpu_fan: read /sys/class/hwmon/hwmon6/pwm1: invalid argument
 WARNING  Error reading PWM value of fan cpu_fan: read /sys/class/hwmon/hwmon6/pwm1: invalid argument
 WARNING  Error reading PWM value of fan cpu_fan: read /sys/class/hwmon/hwmon6/pwm1: invalid argument
 WARNING  Error reading PWM value of fan cpu_fan: read /sys/class/hwmon/hwmon6/pwm1: invalid argument
 WARNING  Error reading PWM value of fan cpu_fan: read /sys/class/hwmon/hwmon6/pwm1: invalid argument
 WARNING  Error reading PWM value of fan cpu_fan: read /sys/class/hwmon/hwmon6/pwm1: invalid argument
 WARNING  Error reading PWM value of fan cpu_fan: read /sys/class/hwmon/hwmon6/pwm1: invalid argument
 WARNING  Error reading PWM value of fan cpu_fan: read /sys/class/hwmon/hwmon6/pwm1: invalid argument
 WARNING  Error reading PWM value of fan cpu_fan: read /sys/class/hwmon/hwmon6/pwm1: invalid argument
 WARNING  Error reading PWM value of fan cpu_fan: read /sys/class/hwmon/hwmon6/pwm1: invalid argument
 WARNING  Error reading PWM value of fan cpu_fan: read /sys/class/hwmon/hwmon6/pwm1: invalid argument
 WARNING  Error reading PWM value of fan cpu_fan: read /sys/class/hwmon/hwmon6/pwm1: invalid argument
 WARNING  Error reading PWM value of fan cpu_fan: read /sys/class/hwmon/hwmon6/pwm1: invalid argument
 WARNING  Error reading PWM value of fan cpu_fan: read /sys/class/hwmon/hwmon6/pwm1: invalid argument
 WARNING  Error reading PWM value of fan cpu_fan: read /sys/class/hwmon/hwmon6/pwm1: invalid argument
 WARNING  Error reading PWM value of fan cpu_fan: read /sys/class/hwmon/hwmon6/pwm1: invalid argument
 WARNING  Error reading PWM value of fan cpu_fan: read /sys/class/hwmon/hwmon6/pwm1: invalid argument
 WARNING  Error reading PWM value of fan cpu_fan: read /sys/class/hwmon/hwmon6/pwm1: invalid argument
 WARNING  Error reading PWM value of fan cpu_fan: read /sys/class/hwmon/hwmon6/pwm1: invalid argument
 WARNING  Error reading PWM value of fan cpu_fan: read /sys/class/hwmon/hwmon6/pwm1: invalid argument
 WARNING  Error reading PWM value of fan cpu_fan: read /sys/class/hwmon/hwmon6/pwm1: invalid argument
 WARNING  Error reading PWM value of fan cpu_fan: read /sys/class/hwmon/hwmon6/pwm1: invalid argument
 WARNING  Error reading PWM value of fan cpu_fan: read /sys/class/hwmon/hwmon6/pwm1: invalid argument
 WARNING  Error reading PWM value of fan cpu_fan: read /sys/class/hwmon/hwmon6/pwm1: invalid argument
 WARNING  Error reading PWM value of fan cpu_fan: read /sys/class/hwmon/hwmon6/pwm1: invalid argument
 WARNING  Error reading PWM value of fan cpu_fan: read /sys/class/hwmon/hwmon6/pwm1: invalid argument
 WARNING  Error reading PWM value of fan cpu_fan: read /sys/class/hwmon/hwmon6/pwm1: invalid argument
 WARNING  Error reading PWM value of fan cpu_fan: read /sys/class/hwmon/hwmon6/pwm1: invalid argument
 WARNING  Error reading PWM value of fan cpu_fan: read /sys/class/hwmon/hwmon6/pwm1: invalid argument
 WARNING  Error reading PWM value of fan cpu_fan: read /sys/class/hwmon/hwmon6/pwm1: invalid argument
 WARNING  Error reading PWM value of fan cpu_fan: read /sys/class/hwmon/hwmon6/pwm1: invalid argument
 WARNING  Error reading PWM value of fan cpu_fan: read /sys/class/hwmon/hwmon6/pwm1: invalid argument
 WARNING  Error reading PWM value of fan cpu_fan: read /sys/class/hwmon/hwmon6/pwm1: invalid argument
 WARNING  Error reading PWM value of fan cpu_fan: read /sys/class/hwmon/hwmon6/pwm1: invalid argument
 WARNING  Error reading PWM value of fan cpu_fan: read /sys/class/hwmon/hwmon6/pwm1: invalid argument
 WARNING  Error reading PWM value of fan cpu_fan: read /sys/class/hwmon/hwmon6/pwm1: invalid argument
 WARNING  Error reading PWM value of fan cpu_fan: read /sys/class/hwmon/hwmon6/pwm1: invalid argument
 WARNING  Error reading PWM value of fan cpu_fan: read /sys/class/hwmon/hwmon6/pwm1: invalid argument
 WARNING  Error reading PWM value of fan cpu_fan: read /sys/class/hwmon/hwmon6/pwm1: invalid argument
 WARNING  Error reading PWM value of fan cpu_fan: read /sys/class/hwmon/hwmon6/pwm1: invalid argument
 WARNING  Error reading PWM value of fan cpu_fan: read /sys/class/hwmon/hwmon6/pwm1: invalid argument
 WARNING  Error reading PWM value of fan cpu_fan: read /sys/class/hwmon/hwmon6/pwm1: invalid argument
 WARNING  Error reading PWM value of fan cpu_fan: read /sys/class/hwmon/hwmon6/pwm1: invalid argument
 WARNING  Error reading PWM value of fan cpu_fan: read /sys/class/hwmon/hwmon6/pwm1: invalid argument
 WARNING  Error reading PWM value of fan cpu_fan: read /sys/class/hwmon/hwmon6/pwm1: invalid argument
 WARNING  Error reading PWM value of fan cpu_fan: read /sys/class/hwmon/hwmon6/pwm1: invalid argument
 WARNING  Error reading PWM value of fan cpu_fan: read /sys/class/hwmon/hwmon6/pwm1: invalid argument
 WARNING  Error reading PWM value of fan cpu_fan: read /sys/class/hwmon/hwmon6/pwm1: invalid argument
 WARNING  Error reading PWM value of fan cpu_fan: read /sys/class/hwmon/hwmon6/pwm1: invalid argument
 WARNING  Error reading PWM value of fan cpu_fan: read /sys/class/hwmon/hwmon6/pwm1: invalid argument
 WARNING  Error reading PWM value of fan cpu_fan: read /sys/class/hwmon/hwmon6/pwm1: invalid argument
 WARNING  Error reading PWM value of fan cpu_fan: read /sys/class/hwmon/hwmon6/pwm1: invalid argument
 WARNING  Error reading PWM value of fan cpu_fan: read /sys/class/hwmon/hwmon6/pwm1: invalid argument
 WARNING  Error reading PWM value of fan cpu_fan: read /sys/class/hwmon/hwmon6/pwm1: invalid argument
 WARNING  Error reading PWM value of fan cpu_fan: read /sys/class/hwmon/hwmon6/pwm1: invalid argument
 WARNING  Error reading PWM value of fan cpu_fan: read /sys/class/hwmon/hwmon6/pwm1: invalid argument
 WARNING  Error reading PWM value of fan cpu_fan: read /sys/class/hwmon/hwmon6/pwm1: invalid argument
 WARNING  Error reading PWM value of fan cpu_fan: read /sys/class/hwmon/hwmon6/pwm1: invalid argument
 WARNING  Error reading PWM value of fan cpu_fan: read /sys/class/hwmon/hwmon6/pwm1: invalid argument
 WARNING  Error reading PWM value of fan cpu_fan: read /sys/class/hwmon/hwmon6/pwm1: invalid argument
 WARNING  Error reading PWM value of fan cpu_fan: read /sys/class/hwmon/hwmon6/pwm1: invalid argument
 WARNING  Error reading PWM value of fan cpu_fan: read /sys/class/hwmon/hwmon6/pwm1: invalid argument
 WARNING  Error reading PWM value of fan cpu_fan: read /sys/class/hwmon/hwmon6/pwm1: invalid argument
 WARNING  Error reading PWM value of fan cpu_fan: read /sys/class/hwmon/hwmon6/pwm1: invalid argument
 WARNING  Error reading PWM value of fan cpu_fan: read /sys/class/hwmon/hwmon6/pwm1: invalid argument
 WARNING  Error reading PWM value of fan cpu_fan: read /sys/class/hwmon/hwmon6/pwm1: invalid argument
 WARNING  Error reading PWM value of fan cpu_fan: read /sys/class/hwmon/hwmon6/pwm1: invalid argument
 WARNING  Error reading PWM value of fan cpu_fan: read /sys/class/hwmon/hwmon6/pwm1: invalid argument
 WARNING  Error reading PWM value of fan cpu_fan: read /sys/class/hwmon/hwmon6/pwm1: invalid argument
 WARNING  Error reading PWM value of fan cpu_fan: read /sys/class/hwmon/hwmon6/pwm1: invalid argument
 WARNING  Error reading PWM value of fan cpu_fan: read /sys/class/hwmon/hwmon6/pwm1: invalid argument
 WARNING  Error reading PWM value of fan cpu_fan: read /sys/class/hwmon/hwmon6/pwm1: invalid argument
 WARNING  Error reading PWM value of fan cpu_fan: read /sys/class/hwmon/hwmon6/pwm1: invalid argument
 WARNING  Error reading PWM value of fan cpu_fan: read /sys/class/hwmon/hwmon6/pwm1: invalid argument
 WARNING  Error reading PWM value of fan cpu_fan: read /sys/class/hwmon/hwmon6/pwm1: invalid argument
 WARNING  Error reading PWM value of fan cpu_fan: read /sys/class/hwmon/hwmon6/pwm1: invalid argument
 WARNING  Error reading PWM value of fan cpu_fan: read /sys/class/hwmon/hwmon6/pwm1: invalid argument
 WARNING  Error reading PWM value of fan cpu_fan: read /sys/class/hwmon/hwmon6/pwm1: invalid argument
 WARNING  Error reading PWM value of fan cpu_fan: read /sys/class/hwmon/hwmon6/pwm1: invalid argument
 WARNING  Error reading PWM value of fan cpu_fan: read /sys/class/hwmon/hwmon6/pwm1: invalid argument
 WARNING  Error reading PWM value of fan cpu_fan: read /sys/class/hwmon/hwmon6/pwm1: invalid argument
 WARNING  Error reading PWM value of fan cpu_fan: read /sys/class/hwmon/hwmon6/pwm1: invalid argument
 WARNING  Error reading PWM value of fan cpu_fan: read /sys/class/hwmon/hwmon6/pwm1: invalid argument
 WARNING  Error reading PWM value of fan cpu_fan: read /sys/class/hwmon/hwmon6/pwm1: invalid argument
 WARNING  Error reading PWM value of fan cpu_fan: read /sys/class/hwmon/hwmon6/pwm1: invalid argument
 WARNING  Error reading PWM value of fan cpu_fan: read /sys/class/hwmon/hwmon6/pwm1: invalid argument
 WARNING  Error reading PWM value of fan cpu_fan: read /sys/class/hwmon/hwmon6/pwm1: invalid argument
 WARNING  Error reading PWM value of fan cpu_fan: read /sys/class/hwmon/hwmon6/pwm1: invalid argument
 WARNING  Error reading PWM value of fan cpu_fan: read /sys/class/hwmon/hwmon6/pwm1: invalid argument
 WARNING  Error reading PWM value of fan cpu_fan: read /sys/class/hwmon/hwmon6/pwm1: invalid argument
 WARNING  Error reading PWM value of fan cpu_fan: read /sys/class/hwmon/hwmon6/pwm1: invalid argument
 WARNING  Error reading PWM value of fan cpu_fan: read /sys/class/hwmon/hwmon6/pwm1: invalid argument
 WARNING  Error reading PWM value of fan cpu_fan: read /sys/class/hwmon/hwmon6/pwm1: invalid argument
 WARNING  Error reading PWM value of fan cpu_fan: read /sys/class/hwmon/hwmon6/pwm1: invalid argument
 WARNING  Error reading PWM value of fan cpu_fan: read /sys/class/hwmon/hwmon6/pwm1: invalid argument
 WARNING  Error reading PWM value of fan cpu_fan: read /sys/class/hwmon/hwmon6/pwm1: invalid argument
 WARNING  Error reading PWM value of fan cpu_fan: read /sys/class/hwmon/hwmon6/pwm1: invalid argument
 WARNING  Error reading PWM value of fan cpu_fan: read /sys/class/hwmon/hwmon6/pwm1: invalid argument
 WARNING  Error reading PWM value of fan cpu_fan: read /sys/class/hwmon/hwmon6/pwm1: invalid argument
 WARNING  Error reading PWM value of fan cpu_fan: read /sys/class/hwmon/hwmon6/pwm1: invalid argument
 WARNING  Error reading PWM value of fan cpu_fan: read /sys/class/hwmon/hwmon6/pwm1: invalid argument
 WARNING  Error reading PWM value of fan cpu_fan: read /sys/class/hwmon/hwmon6/pwm1: invalid argument
 WARNING  Error reading PWM value of fan cpu_fan: read /sys/class/hwmon/hwmon6/pwm1: invalid argument
 WARNING  Error reading PWM value of fan cpu_fan: read /sys/class/hwmon/hwmon6/pwm1: invalid argument
 WARNING  Error reading PWM value of fan cpu_fan: read /sys/class/hwmon/hwmon6/pwm1: invalid argument
 WARNING  Error reading PWM value of fan cpu_fan: read /sys/class/hwmon/hwmon6/pwm1: invalid argument
 WARNING  Error reading PWM value of fan cpu_fan: read /sys/class/hwmon/hwmon6/pwm1: invalid argument
 WARNING  Error reading PWM value of fan cpu_fan: read /sys/class/hwmon/hwmon6/pwm1: invalid argument
 WARNING  Error reading PWM value of fan cpu_fan: read /sys/class/hwmon/hwmon6/pwm1: invalid argument
 WARNING  Error reading PWM value of fan cpu_fan: read /sys/class/hwmon/hwmon6/pwm1: invalid argument
 WARNING  Error reading PWM value of fan cpu_fan: read /sys/class/hwmon/hwmon6/pwm1: invalid argument
 WARNING  Error reading PWM value of fan cpu_fan: read /sys/class/hwmon/hwmon6/pwm1: invalid argument
 WARNING  Error reading PWM value of fan cpu_fan: read /sys/class/hwmon/hwmon6/pwm1: invalid argument
 WARNING  Error reading PWM value of fan cpu_fan: read /sys/class/hwmon/hwmon6/pwm1: invalid argument
 WARNING  Error reading PWM value of fan cpu_fan: read /sys/class/hwmon/hwmon6/pwm1: invalid argument
 WARNING  Error reading PWM value of fan cpu_fan: read /sys/class/hwmon/hwmon6/pwm1: invalid argument
 WARNING  Error reading PWM value of fan cpu_fan: read /sys/class/hwmon/hwmon6/pwm1: invalid argument
 WARNING  Error reading PWM value of fan cpu_fan: read /sys/class/hwmon/hwmon6/pwm1: invalid argument
 WARNING  Error reading PWM value of fan cpu_fan: read /sys/class/hwmon/hwmon6/pwm1: invalid argument
 WARNING  Error reading PWM value of fan cpu_fan: read /sys/class/hwmon/hwmon6/pwm1: invalid argument
 WARNING  Error reading PWM value of fan cpu_fan: read /sys/class/hwmon/hwmon6/pwm1: invalid argument
 WARNING  Error reading PWM value of fan cpu_fan: read /sys/class/hwmon/hwmon6/pwm1: invalid argument
 WARNING  Error reading PWM value of fan cpu_fan: read /sys/class/hwmon/hwmon6/pwm1: invalid argument
 WARNING  Error reading PWM value of fan cpu_fan: read /sys/class/hwmon/hwmon6/pwm1: invalid argument
 WARNING  Error reading PWM value of fan cpu_fan: read /sys/class/hwmon/hwmon6/pwm1: invalid argument
 WARNING  Error reading PWM value of fan cpu_fan: read /sys/class/hwmon/hwmon6/pwm1: invalid argument
 WARNING  Error reading PWM value of fan cpu_fan: read /sys/class/hwmon/hwmon6/pwm1: invalid argument
 WARNING  Error reading PWM value of fan cpu_fan: read /sys/class/hwmon/hwmon6/pwm1: invalid argument
 WARNING  Error reading PWM value of fan cpu_fan: read /sys/class/hwmon/hwmon6/pwm1: invalid argument
 WARNING  Error reading PWM value of fan cpu_fan: read /sys/class/hwmon/hwmon6/pwm1: invalid argument
 WARNING  Error reading PWM value of fan cpu_fan: read /sys/class/hwmon/hwmon6/pwm1: invalid argument
 WARNING  Error reading PWM value of fan cpu_fan: read /sys/class/hwmon/hwmon6/pwm1: invalid argument
 WARNING  Error reading PWM value of fan cpu_fan: read /sys/class/hwmon/hwmon6/pwm1: invalid argument
 WARNING  Error reading PWM value of fan cpu_fan: read /sys/class/hwmon/hwmon6/pwm1: invalid argument
 WARNING  Error reading PWM value of fan cpu_fan: read /sys/class/hwmon/hwmon6/pwm1: invalid argument
 WARNING  Error reading PWM value of fan cpu_fan: read /sys/class/hwmon/hwmon6/pwm1: invalid argument
 WARNING  Error reading PWM value of fan cpu_fan: read /sys/class/hwmon/hwmon6/pwm1: invalid argument
 WARNING  Error reading PWM value of fan cpu_fan: read /sys/class/hwmon/hwmon6/pwm1: invalid argument
 WARNING  Error reading PWM value of fan cpu_fan: read /sys/class/hwmon/hwmon6/pwm1: invalid argument
 WARNING  Error reading PWM value of fan cpu_fan: read /sys/class/hwmon/hwmon6/pwm1: invalid argument
 WARNING  Error reading PWM value of fan cpu_fan: read /sys/class/hwmon/hwmon6/pwm1: invalid argument
 WARNING  Error reading PWM value of fan cpu_fan: read /sys/class/hwmon/hwmon6/pwm1: invalid argument
 WARNING  Error reading PWM value of fan cpu_fan: read /sys/class/hwmon/hwmon6/pwm1: invalid argument
 WARNING  Error reading PWM value of fan cpu_fan: read /sys/class/hwmon/hwmon6/pwm1: invalid argument
 WARNING  Error reading PWM value of fan cpu_fan: read /sys/class/hwmon/hwmon6/pwm1: invalid argument
 WARNING  Error reading PWM value of fan cpu_fan: read /sys/class/hwmon/hwmon6/pwm1: invalid argument
 WARNING  Error reading PWM value of fan cpu_fan: read /sys/class/hwmon/hwmon6/pwm1: invalid argument
 WARNING  Error reading PWM value of fan cpu_fan: read /sys/class/hwmon/hwmon6/pwm1: invalid argument
 WARNING  Error reading PWM value of fan cpu_fan: read /sys/class/hwmon/hwmon6/pwm1: invalid argument
 WARNING  Error reading PWM value of fan cpu_fan: read /sys/class/hwmon/hwmon6/pwm1: invalid argument
 WARNING  Error reading PWM value of fan cpu_fan: read /sys/class/hwmon/hwmon6/pwm1: invalid argument
 WARNING  Error reading PWM value of fan cpu_fan: read /sys/class/hwmon/hwmon6/pwm1: invalid argument
 WARNING  Error reading PWM value of fan cpu_fan: read /sys/class/hwmon/hwmon6/pwm1: invalid argument
 WARNING  Error reading PWM value of fan cpu_fan: read /sys/class/hwmon/hwmon6/pwm1: invalid argument
 WARNING  Error reading PWM value of fan cpu_fan: read /sys/class/hwmon/hwmon6/pwm1: invalid argument
 WARNING  Error reading PWM value of fan cpu_fan: read /sys/class/hwmon/hwmon6/pwm1: invalid argument
 WARNING  Error reading PWM value of fan cpu_fan: read /sys/class/hwmon/hwmon6/pwm1: invalid argument
 WARNING  Error reading PWM value of fan cpu_fan: read /sys/class/hwmon/hwmon6/pwm1: invalid argument
 WARNING  Error reading PWM value of fan cpu_fan: read /sys/class/hwmon/hwmon6/pwm1: invalid argument
 WARNING  Error reading PWM value of fan cpu_fan: read /sys/class/hwmon/hwmon6/pwm1: invalid argument
 WARNING  Error reading PWM value of fan cpu_fan: read /sys/class/hwmon/hwmon6/pwm1: invalid argument
 WARNING  Error reading PWM value of fan cpu_fan: read /sys/class/hwmon/hwmon6/pwm1: invalid argument
 WARNING  Error reading PWM value of fan cpu_fan: read /sys/class/hwmon/hwmon6/pwm1: invalid argument
 WARNING  Error reading PWM value of fan cpu_fan: read /sys/class/hwmon/hwmon6/pwm1: invalid argument
 WARNING  Error reading PWM value of fan cpu_fan: read /sys/class/hwmon/hwmon6/pwm1: invalid argument
 WARNING  Error reading PWM value of fan cpu_fan: read /sys/class/hwmon/hwmon6/pwm1: invalid argument
 WARNING  Error reading PWM value of fan cpu_fan: read /sys/class/hwmon/hwmon6/pwm1: invalid argument
 WARNING  Error reading PWM value of fan cpu_fan: read /sys/class/hwmon/hwmon6/pwm1: invalid argument
 WARNING  Error reading PWM value of fan cpu_fan: read /sys/class/hwmon/hwmon6/pwm1: invalid argument
 WARNING  Error reading PWM value of fan cpu_fan: read /sys/class/hwmon/hwmon6/pwm1: invalid argument
 WARNING  Error reading PWM value of fan cpu_fan: read /sys/class/hwmon/hwmon6/pwm1: invalid argument
 WARNING  Error reading PWM value of fan cpu_fan: read /sys/class/hwmon/hwmon6/pwm1: invalid argument
 WARNING  Error reading PWM value of fan cpu_fan: read /sys/class/hwmon/hwmon6/pwm1: invalid argument
 WARNING  Error reading PWM value of fan cpu_fan: read /sys/class/hwmon/hwmon6/pwm1: invalid argument
 INFO  Measuring RPM curve...
  ERROR   Fan cpu_fan: Unable to measure current PWM
 INFO  Fan controller for fan cpu_fan stopped.
  ERROR   Error sending notification: exit status 1
panic: read /sys/class/hwmon/hwmon6/pwm1: invalid argument

goroutine 165 [running]:
github.com/markusressel/fan2go/internal.RunDaemon.func7()
	github.com/markusressel/fan2go/internal/backend.go:139 +0x16b
github.com/oklog/run.(*Group).Run.func1({0xc00014a0c0?, 0xc000158570?})
	github.com/oklog/[email protected]/group.go:38 +0x29
created by github.com/oklog/run.(*Group).Run in goroutine 1
	github.com/oklog/[email protected]/group.go:37 +0x5a

fan2go exits after about a second.

Expected behavior
fan2go only writes to /sys/class/hwmon/hwmon6/pwm1 depending on sensor readings

Desktop (please complete the following information):

  • Distro: NixOS 24.11
  • uname -a: Linux uqbar 6.12.9 #1-NixOS SMP PREEMPT_DYNAMIC Thu Jan 9 12:33:55 UTC 2025 x86_64 GNU/Linux
  • sensors -v: sensors version 3.6.0 with libsensors version 3.6.0
  • fan2go version: 0.9.0

Additional context
this is distinct from #229 On my system pwm_enable does not even exist, and writing pwm1 works without any preparation.
@symphorien symphorien added the bug Something isn't working label Jan 27, 2025
@symphorien
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Note that current fan speed is available as:

/sys/devices/platform/dell_smm_hwmon/hwmon/hwmon6/fan1_input
3624

this is what the sensors command displays.

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