Re: [PATCH] x86/PCI: Disable D3cold on Intel BE200 Wi-Fi on Lenovo IdeaPad Pro 5 14IAH10

[sashiko-bot@kernel.org]

> On the Lenovo IdeaPad Pro 5 14IAH10, the Intel BE200 Wi-Fi (8086:272b,
> iwlwifi) fails to power back on from D3cold after a suspend-to-idle
> (s2idle) cycle.  On resume the platform reports a successful ACPI D0
> transition, but the device is left unpowered: config space reads back
> as 0xffffffff, the firmware reset times out, and the wiphy fails to
> resume:
> 
>   iwlwifi 0000:01:00.0: power state changed by ACPI to D0
>   iwlwifi 0000:01:00.0: restore config 0x2c: 0xffffffff -> 0x00f48086
>   ieee80211 phy0: PM: failed to resume async: error -110
> 
> The device stays unusable until a full power cycle; an iwlwifi module
> reload and a PCI remove/rescan do not recover it, confirming the device
> is genuinely unpowered rather than in a bad software state.
> 
> Setting the device's d3cold_allowed to 0 keeps it in D3hot across
> suspend and resumes reliably, so the platform does not correctly restore
> power to the M.2 Wi-Fi slot on the s2idle resume path.  This mirrors the
> untested-vendor-transition pattern already handled for the Asus B1400
> NVMe (see asus_disable_nvme_d3cold): the reference OS does not appear to
> exercise the D3cold->D0 path, so it is left untested.
> 
> Add a DMI-matched fixup that forbids D3cold for the BE200 on this model.
> Match on the product rather than the BIOS version so the workaround
> survives BIOS updates that do not address the issue.
> 
> Signed-off-by: Nika Krasnova <nika@nikableh.moe>

Sashiko has reviewed this patch and found no issues. It looks great!

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Sashiko AI review · https://sashiko.dev/#/patchset/20260722021321.68902-1-nika@nikableh.moe?part=1