[Bug 221569] Laptop fan too loud (spinning nearly always) hp-wmi 7.1-rc4 kerenel

[bugzilla-daemon@kernel.org]

https://bugzilla.kernel.org/show_bug.cgi?id=221569

--- Comment #43 from Marco Scardovi (scardracs@disroot.org) ---
Since all your temperatures are now very low (CPU at 39.9°C, WiFi at 49°C, NVMe
at 37.9°C, GPU at 38°C) but the fan is still spinning at 2100 RPM, there are
two likely explanations I can think of:

1. HP BIOS "Fan Always On" Setting [1]: HP laptops commonly have a BIOS option
called "Fan Always On" (usually under System Configuration or Power settings).
When enabled (which is often the default, especially when plugged into AC
power), the motherboard firmware will keep the fan spinning constantly, even if
the laptop is freezing cold. It will only ramp up when hot, but will never
stop.
2. BIOS Thermal Hysteresis: Firmwares use a cooling hysteresis window to
prevent the fan from constantly pulsing on and off. For example, the fan might
trigger at 55°C but will only turn off once the system cools down below 35°C or
30°C. If your idle baseline is around 37-40°C, it might stay just above the
cutoff threshold.

[1]
https://h30434.www3.hp.com/t5/Notebook-Software-and-How-To-Questions/quot-fan-always-on-quot-in-bios/td-p/8924322

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