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desbma / hddfancontrol

Regulate fan speed according to hard drive temperature
GNU General Public License v3.0
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pwm_enable resets to 2 after suspend #17

Closed adrfantini closed 5 years ago

adrfantini commented 5 years ago

When hddfancontrol starts, I get this warning:

WARNING [Fan #1] /run/hddfancontrol_fan_hwmon/pwm2_enable was 2, setting it to 1

After a suspend-resume, the kernel apparently resets the value to 2, and hddfancontrol is not able to control fan speed anymore. In fact, if I manually try:

root@serverino ~# echo 120 >  /run/hddfancontrol_fan_hwmon/pwm2
Error while writing to stdout
write_loop: Device or resource busy
root@serverino ~# echo 1 >  /run/hddfancontrol_fan_hwmon/pwm2_enable 
root@serverino ~# echo 120 >  /run/hddfancontrol_fan_hwmon/pwm2
root@serverino ~#

Maybe hddfancontrol should periodically check the pwm_enable file, instead of just at startup?

desbma commented 5 years ago

The value of pwmX_enable is checked, and set to 1 if needed, everytime a value is written to the PWM file. What error are you having after resuming?

adrfantini commented 5 years ago

I got no errors in the logs and stuff seems to function normally. I guess that when I was looking, hddfancontrol did not need to turn the fan on, so I did not notice it resetting the value. I assumed, wrongly, that it did so only after startup. Sorry for wasting your time, closing.