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

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Message-ID: <4ad3c778-3737-41b5-a1ac-91822f253185@0upti.me>
Date: Tue, 29 Jul 2025 07:29:36 +0300
From: Ilya K <me@...ti.me>
To: Armin Wolf <W_Armin@....de>, rafael@...nel.org
Cc: 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



On 2025-07-29 01:13, Armin Wolf wrote:
>
> 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.
>

The firmware update did not, in fact, change anything. Here's the entire ECDT:

[000h 0000 004h]                   Signature : "ECDT"    [Embedded Controller Boot Resources Table]
[004h 0004 004h]                Table Length : 00000069
[008h 0008 001h]                    Revision : 01
[009h 0009 001h]                    Checksum : 6E
[00Ah 0010 006h]                      Oem ID : "LENOVO"
[010h 0016 008h]                Oem Table ID : "CB-01   "
[018h 0024 004h]                Oem Revision : 00000001
[01Ch 0028 004h]             Asl Compiler ID : "LENO"
[020h 0032 004h]       Asl Compiler Revision : 00000001


[024h 0036 00Ch]     Command/Status Register : [Generic Address Structure]
[024h 0036 001h]                    Space ID : 01 [SystemIO]
[025h 0037 001h]                   Bit Width : 08
[026h 0038 001h]                  Bit Offset : 00
[027h 0039 001h]        Encoded Access Width : 00 [Undefined/Legacy]
[028h 0040 008h]                     Address : 0000000000000066

[030h 0048 00Ch]               Data Register : [Generic Address Structure]
[030h 0048 001h]                    Space ID : 01 [SystemIO]
[031h 0049 001h]                   Bit Width : 08
[032h 0050 001h]                  Bit Offset : 00
[033h 0051 001h]        Encoded Access Width : 00 [Undefined/Legacy]
[034h 0052 008h]                     Address : 0000000000000062

[03Ch 0060 004h]                         UID : 00000000
[040h 0064 001h]                  GPE Number : 6E
[041h 0065 012h]                    Namepath : "_SB.PC00.LPCB.EC0"

Raw Table Data: Length 105 (0x69)

    0000: 45 43 44 54 69 00 00 00 01 6E 4C 45 4E 4F 56 4F  // ECDTi....nLENOVO
    0010: 43 42 2D 30 31 20 20 20 01 00 00 00 4C 45 4E 4F  // CB-01   ....LENO
    0020: 01 00 00 00 01 08 00 00 66 00 00 00 00 00 00 00  // ........f.......
    0030: 01 08 00 00 62 00 00 00 00 00 00 00 00 00 00 00  // ....b...........
    0040: 6E 5F 53 42 2E 50 43 30 30 2E 4C 50 43 42 2E 45  // n_SB.PC00.LPCB.E
    0050: 43 30 00 00 00 00 00 00 00 00 00 00 00 00 00 00  // C0..............
    0060: 00 00 00 00 00 00 00 00 00                       // .........

It is fully identical on both firmware versions I've seen.