Re: [PATCH] PCI / ACPI: Don't clear pme_poll on device that has unreliable ACPI wake

Kai Heng Feng
2019-02-02T17:46:50Z

Hi Bjorn,

> On Jan 28, 2019, at 3:51 PM, Kai Heng Feng <kai.heng.feng@canonical.com> wrote:
[snipped]

>> If I understand correctly, the bugzilla lspci
>> (https://bugzilla.kernel.org/attachment.cgi?id=280691) was collected
>> at point 8, and it shows PME_Status=1 when it should be 0.
>>
>> If we write a 1 to PME_Status to clear it, and it remains set, that's
>> obviously a hardware defect, and Intel should document that in an
>> erratum, and a quirk would be the appropriate way to work around it.
>> But I doubt that's what's happening.
>
> I’ll ask them if they can provide an erratum.

Got confirmed with e1000e folks, I219 (the device in question) doesn’t really support runtime D3.
I also checked the behavior of the device under Windows, and it stays at D0 all the time even when it’s not in use.

So I sent a patch [1] to disable it.

[1] https://lkml.org/lkml/2019/2/2/200

Kai-Heng