Fan speed indicator always stays at zero RPM

[CiscoDeTours]

Checklist

• The problem is not listed in the hardware support matrix as a known limitation
• I've included a debug snapshot if the issue is related to hardware configuration

Bug description

- Current behavior

The fan speed indicator stays at zero even when it's spinning 10000 times faster than the recommended speed for a carousel.

- Debug

LACT-sysfs-snapshot-20240510-180316.tar.gz

- Expected behavior

sensors

hp-isa-0000
Adapter: ISA adapter
fan1:        2364 RPM
fan2:        2193 RPM

For example, the speed is displayed on the Console while executing sensors and it would be really helpful to have that data working on this great program for my dGPU.

System info

DEVICE 
•PC: OMEN by HP Laptop 16-c0xxx 
 
SOFTWARE 
•Distro: Debian GNU/Linux 12 (bookworm) 
•Desktop: GNOME 43.9 
•Session: wayland 
•Kernel: 6.6.15-amd64 
•Shell: bash 5.2.15 
 
COMPONENTS 
•CPU: AMD Ryzen 9 5900HX 
•GPU: AMD ATI Radeon RX 6600M 
•GPU: AMD ATI Radeon Vega Series / Radeon Vega Mobile Series 

LACT (dpkg -s lact)
•Package: lact
•Status: install ok installed
•Installed-Size: 6604
•Maintainer: ilya-zlobintsev
•Architecture: amd64
•Version: 0.5.4-0
•Provides: lact
•Depends: hwdata, libgtk-4-1
•Conflicts: lact-headless, lact-libadwaita
•Description: AMDGPU control utility
•Homepage: https://github.com/ilya-zlobintsev/lact

[ilya-zlobintsev]

This seems to be a quirk of how laptop fan control works - the RPM reported by the GPU is actually 0 (in /sys/class/drm/card0/device/hwmon/hwmon4/fan1_input), and the sensors command shows you a different fan sensor (hp-isa-0000), not the GPU one.

Do the settings in LACT actually set the fan speed though, even if it's not being reported correctly? If they do, it could be possible to show the target speed of the fan that LACT sets in addition to the actually reported one for situations like this.

[CiscoDeTours]

I got an error message while changing the values ​​to do some testing.

[Nachowarrior]

I have a similar, but different issue. Lact will only spin up the fans at all for a short period of time before dropping back to zero. actual fan speed is not controlled at all by lact after this period of a few seconds. It was working at one point, no idea why the functionality broke. Desktop rx7600 hellhound. Tried both bios settings on the card. enabled the system ctl. any insight on how to fix would be welcome.