fancontrol shows errors and doesn't seem to work

Bug #1803795 reported by flip101 on 2018-11-17
This bug affects 1 person
Affects Status Importance Assigned to Milestone
lm-sensors (Ubuntu)

Bug Description

When running sudo pwmconfig i get the following errors:

/usr/sbin/pwmconfig: line 455: let: threshold=3*/4: syntax error: operand expected (error token is "/4")

cat: hwmon0/fan1_input: Invalid argument

Also my CPU fan did not stop but kept spinning (it was suppose to stop for 5 seconds). Please see the attached file for my terminal session and a report on my computer.

Ubuntu 18.10
Fancontrol 1:3.4.0-4

flip101 (flip101) wrote :
Andreas Hasenack (ahasenack) wrote :

Thanks for filing this bug in Ubuntu.

The error was kind of detected by the script:
cat: hwmon0/fan1_input: Invalid argument
    Fan hwmon0/fan1_input has not returned to speed, please investigate!

As the output says, it's not guaranteed to work with all motherboards: "Note that many motherboards do not have pwm circuitry installed, even if your sensor chip supports pwm."

My own server reports having pwm controls for the fans, but fancontrol can't control them, so it falls under the category of the disclaimer above.

I tried to reach upstream to see if there were bug reports there, but seems down.

For the time being, may I suggest you file a bug report at with your log, which contains the chipset you have? Maybe it can be supported in the future.

Changed in lm-sensors (Ubuntu):
status: New → Incomplete
flip101 (flip101) wrote :

I forgot to mention one very important thing. In windows i have the asrock application F-Tune which does the fan control perfectly. Which leads me to conclude that all hardware support is in place.

flip101 (flip101) wrote :

The name of the utility is not f-tune but f-stream. I reported the bug here

Andreas Hasenack (ahasenack) wrote :

Thanks for filing the upstream bug. That is the best place for this discussion. I'll mark this bug as "confirmed" in the meantime, but we will need a new upstream version or a patch from them to fix this in Ubuntu.

Changed in lm-sensors (Ubuntu):
status: Incomplete → Confirmed
Changed in lmsensors:
status: Unknown → New
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