From mboxrd@z Thu Jan  1 00:00:00 1970
From: "Rafael J. Wysocki" <rafael@kernel.org>
Subject: Re: [PATCH 0/3] ACPI / sleep: Support power button wakeup from S2I on
 recent Dell laptops
Date: Tue, 13 Jun 2017 02:22:37 +0200
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To: =?UTF-8?B?SsOpcsO0bWUgZGUgQnJldGFnbmU=?= <jerome.debretagne@gmail.com>
Cc: "Rafael J. Wysocki" <rafael@kernel.org>, "Rafael J. Wysocki" <rjw@rjwysocki.net>, Mario Limonciello <Mario.Limonciello@dell.com>, ACPI Devel Maling List <linux-acpi@vger.kernel.org>, Linux PM <linux-pm@vger.kernel.org>, Andy Shevchenko <andriy.shevchenko@linux.intel.com>, Darren Hart <dvhart@infradead.org>, Srinivas Pandruvada <srinivas.pandruvada@linux.intel.com>, Mika Westerberg <mika.westerberg@linux.intel.com>

On Tue, Jun 13, 2017 at 2:00 AM, J=C3=A9r=C3=B4me 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 th=
ough?

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