[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 #32 from Marco Scardovi (scardracs@disroot.org) ---
Regarding the custom FAN curve or trigger temperatures:

On your laptop, the fan speed is controlled by the ACPI thermal subsystem
directly (acpi_fan-isa-0000 is reporting the 2100 RPM), while hp-wmi
(hp-isa-0000) reports 0 RPM because manual fan control interface is not exposed
by HP firmware on generic non-gaming (non-Omen/Victus) models.

Looking at your sensors output, the MediaTek WiFi card (mt7925) is reporting a
temperature of +86.0°C. Modern thin-and-light laptop firmware (Embedded
Controller) often monitors multiple sensors (CPU, NVMe, WiFi, and skin
sensors). If the WiFi card or NVMe SSD is hot, the BIOS/EC will keep the fan
spinning at a low RPM (like 2100 RPM) to cool the chassis, even if the CPU is
idling at 39°C.

You can inspect which ACPI thermal zone is triggering the active cooling by
running:

> tail /sys/class/thermal/thermal_zone*/type
> tail /sys/class/thermal/thermal_zone*/temp

Since the platform profile driver is now working correctly, you should try
switching it to quiet or low-power (if available on your model) using
powerprofilesctl set quiet. This is the official way to tell the EC/BIOS to use
a quieter fan curve and adjust the trip point thresholds.

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