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

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Message-ID: <4e0de0c3-395d-4e70-816c-72a8e75eff8f@gmx.de>
Date: Tue, 29 Jul 2025 00:13:26 +0200
From: Armin Wolf <W_Armin@....de>
To: Ilya K <me@...ti.me>, rafael@...nel.org
Cc: lenb@...nel.org, linux-acpi@...r.kernel.org,
 linux-kernel@...r.kernel.org, glpnk@...ton.me
Subject: Re: [PATCH] ACPI: EC: Ignore ECDT tables with an invalid ID string

Am 28.07.25 um 11:57 schrieb Ilya K:

> 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)

Oh no, that sounds horrible :(

Can you share the output of "acpidump" once the system is running the latest firmware? If a BIOS update
does not solve the issue then we could give the ID string check a more leeway so that only empty strings
are considered invalid.

P.S: You could try if the BIOS update tool also works using Windows PE (https://wiki.archlinux.org/title/Windows_PE).
I used this method a couple of times on my notebook and it worked flawlessly.

Thanks,
Armin Wolf