Re: [PATCH 0/3] ACPI / sleep: Support power button wakeup from S2I on recent Dell laptops

["Rafael J. Wysocki" <rafael@kernel.org>]

On Tue, Jun 13, 2017 at 2:00 AM, Jérôme de Bretagne
<jerome.debretagne@gmail.com> wrote:
>>> One more ouput for tonight. After doing a diff of the acpidump from
>>> both BIOS versions, I've found explicit references to the two 0xCE and
>>> 0xCF values right in the delta, in the dsdt.dsl files.
>>
>> Right.  That's what my last message was about. :-)
>
> Indeed, our messages have crossed each other :-)
>
>>> I'm new to ACPI but could that ECBT mean "EC Button" maybe?
>>
>> That's just a method name which may or may not mean the above.
>>
>> \_SB.PCI0.LPCB.ECDV is the EC, so it is all related.
>>
>> However, the bottom line is that there is no way for the kernel at all
>> to know in advance that these events are going to be generated.
>
> Ok, so I understand that this is totally device-specific :-(

Well, device-and-BIOS-version-specific even.

> Would a patch to handle this specific case be acceptable in the kernel though?

We have quirks. :-)

That said I think intel-hid could check the 0xCE event unconditionally
in the "wakeup" mode, but that will be a separate patch on top of my
series.

Thanks,
Rafael