Re: [RESEND PATCH 0/5] platform/x86: bitland-mifs-wmi: MIFS v2 firmware support (Xiaomi Book Pro 14 2026)

[Armin Wolf]

Am 26.08.26 um 15:29 schrieb KentoNion:

> Hi Armin,
>
> On Thu, Jul 30, 2026 at 11:24:14 +0200, Armin Wolf wrote:
> > can you share the output of "acpidump" on your machine? Missing Lid
> > events usually indicate a deeper problem with the ACPI handling on a
> > given machine.
> Same product as 4/5 (Xiaomi Book Pro 14 2026, DMI board_name=TM2424,
> SKU TM2424-77080, BIOS XMAPT4B0P0707 03/12/2026). acpidump.dat.xz is
> 416K, too large for vger; I can send it off-list or put it on GitHub.
> Decoded DSDT excerpts below.
>
> ECON is declared External in the DSDT and is not defined in any of
> the 34 SSDTs. The only references are _STA on Q_EC, ADP1 and LID0:
>
>      External (ECON, IntObj)
>
>      Device (Q_EC)  /* _HID PNP0C09 */
>      {
>          Method (_STA, 0, NotSerialized)
>          {
>              If ((ECON == One))
>              {
>                  Return (0x0F)
>              }
>              Return (Zero)
>          }
>
>          OperationRegion (ERAM, SystemMemory, 0xFE0B0300, 0x0100)
>          /* LSTE is bit 0 at offset 0x14 of ERAM */
>
>          Method (_GPE, 0, NotSerialized)
>          {
>              If (ESPI)
>              {
>                  Local0 = 0x6E
>              }
>              Return (Local0)
>          }
>
>          Method (_Q0C, 0, NotSerialized)  /* lid close */
>          {
>              LIDS = Zero
>              ^^^GFX0.CLID = Zero
>              Notify (LID0, 0x80)
>          }
>
>          Method (_Q0D, 0, NotSerialized)  /* lid open */
>          {
>              LIDS = One
>              ^^^GFX0.CLID = 0x03
>              Notify (LID0, 0x80)
>          }
>
>          Device (LID0)  /* _HID PNP0C0D */
>          {
>              Method (_STA, 0, NotSerialized)
>              {
>                  If ((ECON == One))
>                  {
>                      Return (0x0F)
>                  }
>                  Return (Zero)
>              }
>          }
>      }
>
> So _STA would return 0 even if ECON existed and were zero, and today
> it AE_NOT_FOUNDs:
>
>    ACPI BIOS Error (bug): Could not resolve symbol
>    [\_SB.PC00.LPCB.Q_EC._STA.ECON], AE_NOT_FOUND
>    (same for Q_EC.ADP1._STA and Q_EC.LID0._STA)
>
> That does not stop the boot DSDT EC or the lid button on this BIOS:
>
>    ACPI: EC: EC started
>    ACPI: \_SB_.PC00.LPCB.Q_EC: Boot DSDT EC used to handle transactions
>    ACPI: EC: interrupt unblocked
>    ACPI: EC: event unblocked
>    ACPI: EC: GPE=0x6e
>    ACPI: \_SB_.PC00.LPCB.Q_EC: EC: Used to handle transactions and events
>    input: Lid Switch as .../PNP0C09:00/PNP0C0D:00/input/input0
>    ACPI: button: Lid Switch [LID0]
>
> LID0 is \_SB_.PC00.LPCB.Q_EC.LID0.
> /proc/acpi/button/lid/LID0/state reads "open" (SW_LID on event0).
> I have not yet captured a close/open pair under acpi_listen; I can
> if that is useful.
>
> 4/5's claim that "the ACPI EC driver therefore never binds" is not
> true here. Polling LSTE and evaluating _Q0C/_Q0D from bitland-mifs-wmi
> would be the wrong layer. I am not putting that in the TM2424
> follow-up on Mingyou's v5. The remaining bug is the missing ECON
> object used by _STA.
>
> Thanks,
> Kento

Interesting, i would suggest a BIOS update. Unfortunately this would likely require you
to also install Windows on this machine, because Xiaomi distributes BIOS updates thru
Windows Update :/.

Thanks,
Armin Wolf