Re: [PATCH 1/1] PCI: Disable D3cold for Killer BE200-family WiFi on MSI Claw A1M

[Denis Benato <denis.benato@linux.dev>]

26 ott 2026 19:48:16 Bjorn Helgaas <helgaas@kernel.org>:

> On Sun, Oct 25, 2026 at 11:18:13PM +0000, Denis Benato wrote:
>> During s2idle the platform removes power from the WiFi slot (D3cold).
>> The Killer BE1750 (Intel BE200, 8086:272b) installed in the MSI Claw A1M
>> fails to resume from that state: the PCIe link does not retrain
>> ("pcieport 0000:00:1c.0: Data Link Layer Link Active not set in
>> 100 msec") and every device register reads back as 0xffffffff, so the
>> card disappears from the bus and the machine must be power-cycled.
>>
>> Keeping the device in D3hot with the link in L1.2 during system sleep
>> makes suspend and resume work reliably: the package still reaches >99%
>> S0ix residency and the card survives every cycle (verified over multiple
>> suspend/resume tests with an RTC-timed wake).
>>
>> Disable D3cold for the BE200-family device on this board. This mirrors
>> the udev-level workaround distributions already ship for the AX200/AX210
>> (8086:2725), which suffers from the same class of problem, and moves it
>> into the kernel where it belongs.
>
> If 2725 has the same problem, should we make the quirk apply to it
> also?
>

Hi Bjorn,

Probably yes, but I don't own that hardware, only saw gaming distros are shipping an udev rule to do just that.

> I suppose this is a firmware problem with whatever is supposed to turn
> the power back on?  Are there any firmware updates available?
>

Not that I know of. I have updated my bios (only update available) but the issue is still there.

>> Closes: https://bugzilla.kernel.org/show_bug.cgi?id=220223
>> Signed-off-by: Denis Benato <denis.benato@linux.dev>
>> ---
>> drivers/pci/quirks.c | 21 +++++++++++++++++++++
>> 1 file changed, 21 insertions(+)
>>
>> diff --git a/drivers/pci/quirks.c b/drivers/pci/quirks.c
>> index 7572b358b50f..60156e6c3e49 100644
>> --- a/drivers/pci/quirks.c
>> +++ b/drivers/pci/quirks.c
>> @@ -6593,3 +6593,24 @@ static void pci_mask_replay_timer_timeout(struct pci_dev *pdev)
>> DECLARE_PCI_FIXUP_FINAL(PCI_VENDOR_ID_GLI, 0x9750, pci_mask_replay_timer_timeout);
>> DECLARE_PCI_FIXUP_FINAL(PCI_VENDOR_ID_GLI, 0x9755, pci_mask_replay_timer_timeout);
>> #endif
>> +
>> +/*
>> + * MSI Claw A1M: during s2idle the platform removes power from the WiFi slot
>> + * (D3cold). The Killer BE1750 (Intel BE200, 8086:272b) fails to resume from
>> + * that state: the PCIe link does not retrain ("Data Link Layer Link Active
>> + * not set in 100 msec") and every device register reads back as 0xffffffff,
>> + * so the card disappears from the bus and the machine must be power-cycled.
>> + *
>> + * Keeping the device in D3hot with the link in L1.2 during system sleep makes
>> + * suspend and resume work reliably: the package still reaches >99% S0ix
>> + * residency and the card survives.
>
> From just this patch, I don't think we can assert the L1.2 link state,
> can we?  AFAICS, this patch just prevents the use of D3cold.

From this patch no, but that is the description of what happens on my msi claw when I enter sleep with this patch, checked via s0ixselftest tool.

This is surely better than the previous work around of detaching the driver and re-attaching it leaving the device in d0.

>
>> + */
>> +static void quirk_msi_claw_be200_d3cold(struct pci_dev *pdev)
>> +{
>> +   if (!dmi_match(DMI_BOARD_NAME, "MS-1T41"))
>> +       return;
>> +
>> +   pci_d3cold_disable(pdev);
>> +   pci_info(pdev, "disabling D3cold: slot power removal during s2idle prevents resume on this system");
>> +}
>> +DECLARE_PCI_FIXUP_FINAL(PCI_VENDOR_ID_INTEL, 0x272b, quirk_msi_claw_be200_d3cold);
>> --
>> 2.55.0
>>