Ventilador de laptop sempre diz que está funcionando a 8 RPM

Eu tenho um Lenovo Legion Y520 com estas especificações:

zjeffer@ArchLinux 
----------------- 
OS: Arch Linux x86_64 
Host: 80WK Lenovo Y520-15IKBN 
Kernel: 5.1.7-arch1-1-ARCH 
Uptime: 42 mins 
Packages: 1659 (pacman) 
Shell: zsh 5.7.1 
Resolution: 1920x1080, 1920x1080 
WM: bspwm 
Theme: OSX-Arc-Plus [GTK2/3] 
Icons: Papirus-Light [GTK2/3] 
Terminal: gnome-terminal 
CPU: Intel i7-7700HQ (8) @ 3.800GHz 
GPU: NVIDIA GeForce GTX 1050 Mobile 
GPU: Intel HD Graphics 630 
Memory: 1369MiB / 7866MiB 

Estou usando o thinkfan para tentar controlar meu ventilador da CPU. Infelizmente, não consigo ver qual é a verdadeira velocidade da minha ventoinha, pois sempre diz 8 RPM.

Este é o meu thinkfan.conf, se for importante:

######################################################################
# thinkfan 0.7 example config file
# ================================
#
# ATTENTION: There is only very basic sanity checking on the configuration.
# That means you can set your temperature limits as insane as you like. You
# can do anything stupid, e.g. turn off your fan when your CPU reaches 70°C.
#
# That's why this program is called THINKfan: You gotta think for yourself.
#
######################################################################
#
# IBM/Lenovo Thinkpads (thinkpad_acpi, /proc/acpi/ibm)
# ====================================================
#
# IMPORTANT:
#
# To keep your HD from overheating, you have to specify a correction value for
# the sensor that has the HD's temperature. You need to do this because
# thinkfan uses only the highest temperature it can find in the system, and
# that'll most likely never be your HD, as most HDs are already out of spec
# when they reach 55 °C.
# Correction values are applied from left to right in the same order as the
# temperatures are read from the file.
#
# For example:
# tp_thermal /proc/acpi/ibm/thermal (0, 0, 10)
# will add a fixed value of 10 °C the 3rd value read from that file. Check out
# http://www.thinkwiki.org/wiki/Thermal_Sensors to find out how much you may
# want to add to certain temperatures.

#  Syntax:
#  (LEVEL, LOW, HIGH)
#  LEVEL is the fan level to use (0-7 with thinkpad_acpi)
#  LOW is the temperature at which to step down to the previous level
#  HIGH is the temperature at which to step up to the next level
#  All numbers are integers.
#

# I use this on my T61p:
# tp_fan /proc/acpi/ibm/fan
# tp_thermal /proc/acpi/ibm/thermal (0, 10, 15, 2, 10, 5, 0, 3, 0, 3)

hwmon /sys/devices/platform/coretemp.0/hwmon/hwmon0/temp1_input
hwmon /sys/devices/platform/coretemp.0/hwmon/hwmon0/temp2_input
hwmon /sys/devices/platform/coretemp.0/hwmon/hwmon0/temp3_input
hwmon /sys/devices/platform/coretemp.0/hwmon/hwmon0/temp4_input
hwmon /sys/devices/platform/coretemp.0/hwmon/hwmon0/temp5_input
hwmon /sys/devices/virtual/thermal/thermal_zone1/temp


(0, 0, 51)
(1, 50, 52)
(2, 51, 55)
(3, 54, 58)
(4, 56, 63)
(5, 60, 70)
(6, 66, 79)
(7, 74, 92)
(127, 85, 32767) 

Aqui está a saída de dmesg | grep -i thinkpad:

[    0.000000] Command line: BOOT_IMAGE=/vmlinuz-linux root=UUID=661a855a-c479-4291-bcb2-95b148ce2020 rw quiet nowatchdog nvidia-drm.modeset=1 thinkpad_acpi fan_control=1
[    0.155975] Kernel command line: BOOT_IMAGE=/vmlinuz-linux root=UUID=661a855a-c479-4291-bcb2-95b148ce2020 rw quiet nowatchdog nvidia-drm.modeset=1 thinkpad_acpi fan_control=1
[    4.231093] thinkpad_acpi: ThinkPad ACPI Extras v0.26
[    4.231094] thinkpad_acpi: http://ibm-acpi.sf.net/
[    4.231094] thinkpad_acpi: ThinkPad BIOS 4KCN40WW, EC unknown
[    4.231094] thinkpad_acpi: Lenovo Lenovo Y520-15IKBN, model 80WK
[    4.231554] thinkpad_acpi: Standard ACPI backlight interface available, not loading native one
[    4.231620] thinkpad_acpi: Console audio control enabled, mode: monitor (read only)
[    4.232877] thinkpad_acpi: battery 1 registered (start 0, stop 0)
[    4.232879] battery: new extension: ThinkPad Battery Extension
[    4.232896] input: ThinkPad Extra Buttons as /devices/platform/thinkpad_acpi/input/input8

Aqui diz EC unknown, então não tenho ideia de qual EC eu tenho e não consigo encontrar nada na internet sobre o meu modelo.

Eu verifiquei essa velocidade em s-tui, dentro /proc/acpi/ibm/fane em sensors: está sempre em 8 RPM, o que é impossível se eu puder ouvi-lo explodir a toda velocidade durante os jogos.

No windows 10 descobri que speedfannão encontra nenhum ventilador. Também atualizei minha versão do BIOS de 4KCN40WW para 4KCN45WW. Sem alterações.

Como posso ver a velocidade real do meu ventilador?