linux-kernel - Re: [PATCH 3/4] dell-wmi: Add information about other WMI event codes

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Message-ID: <0d5a8762-b849-41c6-bfe5-e00da25d26d5@gmail.com>
Date:	Wed, 8 Jun 2016 12:44:44 +0200
From:	Gabriele Mazzotta <gabriele.mzt@...il.com>
To:	Mario_Limonciello@...l.com, pali.rohar@...il.com
Cc:	mjg59@...f.ucam.org, dvhart@...radead.org, kernel@...pniu.pl,
	luto@...nel.org, alex.hung@...onical.com,
	platform-driver-x86@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 3/4] dell-wmi: Add information about other WMI event codes

On 08/06/2016 08:02, Mario_Limonciello@...l.com wrote:
>> -----Original Message-----
>> From: Pali Rohár [mailto:pali.rohar@...il.com]
>> Sent: Tuesday, June 7, 2016 6:00 PM
>> To: Gabriele Mazzotta <gabriele.mzt@...il.com>; Limonciello, Mario
>> <Mario_Limonciello@...l.com>
>> Cc: Matthew Garrett <mjg59@...f.ucam.org>; Darren Hart
>> <dvhart@...radead.org>; Michał Kępień <kernel@...pniu.pl>; Andy Lutomirski
>> <luto@...nel.org>; Alex Hung <alex.hung@...onical.com>; platform-driver-
>> x86@...r.kernel.org; linux-kernel@...r.kernel.org
>> Subject: Re: [PATCH 3/4] dell-wmi: Add information about other WMI event
>> codes
>>
>> On Friday 27 May 2016 00:04:23 Gabriele Mazzotta wrote:
>>> On 22/05/2016 13:36, Pali Rohár wrote:
>>>> ACPI DSDT tables have defined other WMI codes, but does not contain
>>>> any description when those codes are emitted. Some other codes can
>>>> be found in logs on internet. In this patch are all which I saw, but
>>>> lot of them are not tested properly (e.g. for duplicate events with
>>>> AT keyboard). Now we have all WMI event codes at one place and in
>>>> future after proper testing those codes can be correctly enabled or
>> disabled...
>>>>
>>>> Signed-off-by: Pali Rohár <pali.rohar@...il.com>
>>>> ---
>>>>  drivers/platform/x86/dell-wmi.c |   32
>> ++++++++++++++++++++++++++++++++
>>>>  1 file changed, 32 insertions(+)
>>>>
>>>> diff --git a/drivers/platform/x86/dell-wmi.c
>>>> b/drivers/platform/x86/dell-wmi.c index 363d927..7aac1dc 100644
>>>> --- a/drivers/platform/x86/dell-wmi.c
>>>> +++ b/drivers/platform/x86/dell-wmi.c
>>>> @@ -110,6 +110,9 @@ static const struct key_entry
>> dell_wmi_legacy_keymap[] __initconst = {
>>>>  	/* BIOS error detected */
>>>>  	{ KE_IGNORE, 0xe00d, { KEY_RESERVED } },
>>>>
>>>> +	/* Unknown, defined in ACPI DSDT */
>>>> +	/* { KE_IGNORE, 0xe00e, { KEY_RESERVED } }, */
>>>> +
>>>
>>> I'm interested in knowing what's the meaning of this 0xe00e. This
>>> event is sent multiple times when I suspend/resume my laptop and it's
>>> definitely not a keypress.
>>
>> From DSDT dumps which I have seen, I guess it could be something with battery
>> charging... but that is only my guess.
>>
>> Mario, do you have any idea, what these unknown events are?
> 
> Off-hand I'm not sure, it would require some more digging.
> 
> Can you please remind me what model numbers and BIOS combinations you have 
> found e00e in DSDT and what context the events are actually happening?   
> Anything released in the past two years?
> 

XPS13 9333, BIOS A07.

I think I saw the event only after resuming from suspend and
it's sent four times in a row.

As Pali says, it seems to be related to the battery. There are
three _Qxx ACPI methods in my DSDT sending this event: one stops
battery charging, one detaches the battery and the last one stores
a value on the GNVS.