High fan speed after suspend

Question

It seems this is a common problem, but I still cannot find a good solution. After a cold boot, my laptop runs perfectly, but after resuming from suspend, the fan kicks in to 100% and blows out cold air, indicating that the fan isn't responding to the temperature of the laptop components. As proof, here's the output from sensors:

acpitz-virtual-0
Adapter: Virtual device
temp1:        +41.0°C  (crit = +101.0°C)

coretemp-isa-0000
Adapter: ISA adapter
Physical id 0:  +43.0°C  (high = +87.0°C, crit = +105.0°C)
Core 0:         +43.0°C  (high = +87.0°C, crit = +105.0°C)
Core 1:         +39.0°C  (high = +87.0°C, crit = +105.0°C)

My laptop model is Sony SVE14A290X. I have tried adding a couple different 99fancontrol.d scripts, but none worked so far. pwmconfig also doesn't report a pwm-capable module in my laptop. Please help!

Answer 1

Unfortunately fancontrol doesn't restore the fan state after suspension. You can write a pm-action(8) resume hook that restarts the fancontrol service:

1. Create a file /etc/pm/sleep.d/10_fancontrol (e. g. with gksudo gedit):

   #!/bin/sh
   case "$1" in
   resume)
       exec service fancontrol restart;;
   esac
   

2. Mark it executable:

   sudo chmod +x /etc/pm/sleep.d/10_fancontrol
   

Answer 2

On more recent Ubuntu using systemd, you need a similar script but in /lib/systemd/system-sleep:

#!/bin/bash
case "$1" in
post)
  exec service fancontrol restart;;
esac

Answer 3

I followed the suggestion for systemd and it worked briefly. It appears to me that it may work only on the first suspend/resume cycle after a cold boot.

I tried restarting the fancontrol service manually but it was 'masked' and permission denied. I tried unmasking it but that did not solve the problem.

Folks have speculated that this issue is a kernel regression. Upon searching it is seen cropping up over the past ten years. Laptops mentioned include Dell, HP, and Lenovo.

I am having the issue on a new Lenovo X1-Carbon, 5th generation, running Ubuntu 16.04.2 LTS Gnome, all updates current, kernel 4.10.0-28-generic.