[Bug 222107] hp-wmi: fan1_input and fan2_input always 0 on OmniBook 7 17-dc (8D9C)

[bugzilla-daemon@kernel.org]

https://bugzilla.kernel.org/show_bug.cgi?id=222107

--- Comment #2 from Krishna Chomal (krishna.chomal108@gmail.com) ---
Hi Jae,

I took a look at your ACPI tables, and they seem consistent with your findings.
The relevant HP WMI methods appear to be stub implementations, which would
explain why the fan-related queries return PASS with a zero payload.

This suggests that the issue is likely on the firmware side rather than a
Linux-specific problem. If the firmware does not implement these methods,
hp-wmi has no meaningful fan-speed data to retrieve through this interface. If
I am not wrong, HP's official software on Windows would also not support fan
read/control behaviour.

For now, it looks like relying on acpi_fan is the best option. Proper support
through hp-wmi would likely require a firmware update from HP that implements
the relevant WMI methods.

Sorry I don't have a better solution!

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