Re: [PATCH v2] platform/x86: thinkpad_acpi: Fix fan speed reporting on ThinkPad L440

[Ilpo Järvinen]

On Mon, 14 Sep 2026 23:11:54 -0300, Daniel Salmun wrote:

> The L440 (BIOS J4ET93WW) reports its fan as stopped: /proc/acpi/ibm/fan
> shows "status: disabled" and "speed: 0", and hwmon fan1_input is 0 under
> any load. EC registers 0x2F and 0x84/0x85 always read 0 on this model.
> 
> The EC uses the 0x93/0x95 layout handled by TPACPI_FAN_NS. 0x93 reads 4
> (FAN_NS_CTRL_STATUS) and 0x95 goes from 255 at idle to about 111 at full
> speed. The DSDT has no fan methods.
> 
> [...]

Thank you for your contribution, it has been applied to my local
review-ilpo-next branch. Note it will show up in the public
platform-drivers-x86/review-ilpo-next branch only once I've pushed my
local branch there, which might take a while.

FYI [if applicable to your patch], as per Linus' policy change, also
fixes are mostly routed through for-next unless the fix is for a
commit introduced in the most recent cycle or is clearly a regression
fix.

The list of commits applied:
[1/1] platform/x86: thinkpad_acpi: Fix fan speed reporting on ThinkPad L440
      commit: 5b16d186082465a5938bff29fe50df144e4efc99

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 i.