linux-kernel - Re: [PATCH] ACPI: EC: Ignore ECDT tables with an invalid ID string

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Message-ID: <9323b4ab-f2c2-41ec-be0e-779d327205ca@0upti.me>
Date: Mon, 28 Jul 2025 12:57:12 +0300
From: Ilya K <me@...ti.me>
To: rafael@...nel.org
Cc: W_Armin@....de, lenb@...nel.org, linux-acpi@...r.kernel.org,
 linux-kernel@...r.kernel.org
Subject: Re: [PATCH] ACPI: EC: Ignore ECDT tables with an invalid ID string

Hello folks!

It looks like this change makes the touchpad stop being detected entirely on my ThinkBook 14 G7 IML[0].

The kernel log says: > ACPI: EC: [Firmware Bug]: Ignoring ECDT due to invalid ID string "_SB.PC00.LPCB.EC0"
Which looks technically invalid, but also probably important? :)

Reverting the change makes things work again. I'm going to try a firmware update and pray to
whatever dark gods are responsible for Lenovo firmware that they fixed their ACPI tables, but
that requires getting Windows on the machine, so it'll take a bit.

[0]: https://psref.lenovo.com/Product/ThinkBook/ThinkBook_14_G7_IML

(resend -glpnk because my mail server is a shit)