Fan speeds stuck at max speed when resuming from sleep

[FPSUsername]

Specs

Laptop: Dell XPS 15 9560 Distro: Arch Linux Kernel: linux-xanmod-edge (5.13.10-1) DE: KDE Plasma 5.22.4 (with SDDM)

Additions

dell-bios-fan-control is installed and bios fan control is turned off.

Issue

Whenever I resume the laptop from sleep, the fans kick on and about 1/5 times they stop spinning immediately after it (since temperatures aren't high, so no need to enable the fans). Otherwise the fans stay at full speed.

Note

This issue also happens on the official Arch kernel and on earlier releases of the 5.13 and 5.12 kernel as far as I can remember. The status of i8kmon.service is active (running) after resuming from sleep, no error messages.

Workarounds

• Restart i8kmon: $ sudo systemctl restart i8kmon
• Type in i8kmon in a terminal (fan speed is immediately updated) and terminate with ctrl + c (or close the terminal)

[FPSUsername]

Workaround using a systemd service:

/etc/systemd/system/restart_i8k.service

[Unit]                                                                                                       
Description=Restart i8kmon after resuming from sleep
After=suspend.target hibernate.target hybrid-sleep.target suspend-then-hibernate.target

[Service]
ExecStart=/home/USERNAME/.restart_i8k.sh

[Install]
WantedBy=suspend.target hibernate.target hybrid-sleep.target suspend-then-hibernate.target

~/.restart_i8k.sh

#!/bin/sh
sudo systemctl restart i8kmon
echo "Restarted fan control"