Re: [PATCH v2] platform/x86: thinkpad_acpi: Add X9-14 Gen 1 to non-standard thermal/fan quirk tables

[Mark Pearson]

On Fri, Sep 18, 2026, at 2:25 PM, Ilpo Järvinen wrote:
> On Sat, 19 Sep 2026 00:15:39 +0800, Huang Wei wrote:
>
>> The Lenovo ThinkPad X9-14 Gen 1 uses a non-standard Embedded Controller
>> firmware (ECFW) whose thermal and fan registers are not located at the
>> classic addresses. On this model the thermal registers sit at 0xA8-0xAF /
>> 0xB8-0xBF and the fan registers use the non-standard offsets, instead of
>> the legacy 0x78-0x7F / 0xC0-0xC7 (thermal) and 0x2f / 0x84 (fan).
>> 
>> Because the model is not covered by the existing quirk tables, the driver
>> probes the legacy thermal addresses during init, reads back 0x00 from
>> every register, concludes the EC is "misbehaving" and disables all
>> thermal sensor access:
>> 
>> [...]
>
> 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: Add X9-14 Gen 1 to non-standard 
> thermal/fan quirk tables
>       commit: bb0f3a5d6b9844b70ad696b9470762028f6d86ec
>
> --
>  i.

Just a note that I have a ticket in to the FW team to confirm this (LO-4662). This platform was Linux certified so I was a bit puzzled at it being different, but I think the proposed patch is correct. Just making sure (and to figure out how we missed it...)

I don't mean to hold up the review - just noting that this is being verified and confirmed on the Lenovo side for completeness

Mark