Fans keep running when putting laptop into sleep/suspend mode ThinkPad T14 Gen 4 i7-1335U

[bremme]

I have a Lenovo ThinkPad T14 Gen 4 with a i7-1335U running Ubuntu 24.04 and I've compiled thinkfan from source. The tool seems to work fine, except for the fact that when I put the laptop into sleep the fans don't stop running. This makes sleep pretty unusable as you can imagine.

Maybe important to add this system only supports s2idle or S0 sleep. I've tried many things but could not get it to work properly. After much trial and error I found a workaround:

sudo systemctl edit thinkfan-sleep
# add the following line

[Service]
ExecStart=sh -c "echo 'disable' > /proc/acpi/ibm/fan"

# reload the deamon afterwards
sudo systemctl daemon-reload
# If all is well you should see your override using cat
sudo systemctl cat thinkfan-sleep
# and that the override has run after a suspend cycle
sudo systemclt status thinkfan-sleep

I was a bit worried that this is potentially unsafe, but if I just watch /proc/acpi/ibm/fan I see the fan's will be enabled automatically after waking from suspend so for me this workable I think.

But I was wondering why this happens in the first place and if there is no other proper way to fix it perhaps? In any case this workaround might be useful for other people struggling with the same issue.

[IvanSafonov]

I have the same laptop and the same problem. It happens when you set manual levels like level 1. Bios for some reason does not turn it off afterwards. The only solution I have found is the same, change level before sleep. And I think it's safer to set level auto. There is a small chance that laptop won't enter sleep mode and the fan will be disabled for some time. The other problem is that now you have two concurrent level changes. Yesterday I'he pushed a new version of my own fan control service, and I think I solved this issue.

[jolars]

I believe this is a duplicate of #181.

[OndraZizka]

Solution: I have installed thinkfan, set it up as a service, and then reset the bios - held a paper clip in a tiny hole at the left bottom of the laptop for 15 seconds. And also I've set the thermal temperature gradient. Now I enjoy the silence.

 185  sudo modprobe -r thinkpad_acpi && sudo modprobe thinkpad_acpi fan_control=1
 186  echo "level 0" | sudo tee /proc/acpi/ibm/fan

 148  sudo apt install thinkfan
 149  sudo nano /etc/modprobe.d/thinkpad_acpi.conf
  ## Contains only:  
  ##  options thinkpad_acpi fan_control=1

 151  sudo thinkfan -n  ## -n No daemon
 157  sudo rm /run/thinkfan.pid 

 153  sudo systemctl enable thinkfan
 154  sudo systemctl start thinkfan
 159  systemctl status thinkfan

Now shut down the laptop, remove the AC charging, reset the BIOS, boot, and it should be silent.
If not, try repeating (I had to do it twice as I did something improperly the first time.

  187  sudo systemctl restart thinkfan
  188  systemctl status thinkfan

[OndraZizka]

The fan levels in /etc/thinkfan.conf:

#######################################################
# Thinkfan Config for Lenovo T14
#######################################################

## See:  $ find /sys/devices -type f -name "temp*_input" | sort
## and pick the one which is likely CPU - coretemp + temp1
sensors:
  - hwmon: /sys/devices/platform/coretemp.0/hwmon/hwmon8/temp1_input

## FANS: Standard ThinkPad interface
fans:
  - tpacpi: /proc/acpi/ibm/fan

## LEVELS: [Speed_Level, Start_Temp, Stop_Temp] . Level 0 is silent/off. Level 7 is maximum.
levels:
  - [0,  0,  55]
  - [1,  50, 60]
  - [2,  55, 63]
  - [3,  60, 66]
  - [4,  63, 70]
  - [5,  67, 75]
  - [7,  72, 85]
  - ["level auto", 80, 32767]