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From:   "Limonciello, Mario" <Mario.Limonciello@dell.com>
To:     Christian Kujau <lists@nerdbynature.de>,
        Andy Lutomirski <luto@kernel.org>,
        "platform-driver-x86@vger.kernel.org" 
        <platform-driver-x86@vger.kernel.org>
CC:     "linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>
Subject: RE: acpi PNP0C14:02: duplicate WMI GUID
 05901221-D566-11D1-B2F0-00A0C9062910
Thread-Topic: acpi PNP0C14:02: duplicate WMI GUID
 05901221-D566-11D1-B2F0-00A0C9062910
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Date:   Wed, 4 Nov 2020 01:09:57 +0000
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> -----Original Message-----
> From: Christian Kujau <lists@nerdbynature.de>
> Sent: Tuesday, November 3, 2020 17:41
> To: Limonciello, Mario; Andy Lutomirski; platform-driver-x86@vger.kernel.=
org
> Cc: linux-kernel@vger.kernel.org
> Subject: acpi PNP0C14:02: duplicate WMI GUID 05901221-D566-11D1-B2F0-
> 00A0C9062910
>=20
>=20
> [EXTERNAL EMAIL]
>=20
> Hi,
>=20
> while looking through boot messages I came across the following on a
> Lenovo T470 laptop with Linux 5.8:
>=20
>   acpi PNP0C14:02: duplicate WMI GUID 05901221-D566-11D1-B2F0-00A0C906291=
0
> (first instance was on PNP0C14:01)
>   acpi PNP0C14:03: duplicate WMI GUID 05901221-D566-11D1-B2F0-00A0C906291=
0
> (first instance was on PNP0C14:01)
>=20
> Searching the interwebs brought me to an old patch proposal:
>=20
>  > https://lkml.org/lkml/2017/12/8/914
>  > Fri, 8 Dec 2017 20:34:21 -0600
>  > [PATCH 2/2] platform/x86: wmi: Allow creating WMI devices with the sam=
e
> GUID
>=20
> The patch was proposed, but never made it into mainline. It's not really =
a
> big deal, booting continues and all devices appear to work, only these tw=
o
> messages get logged during boot. I'm just wondering if this needs to be
> fixed or if it's really just a cosmetic issue.
>=20
> Full dmesg: https://pastebin.ubuntu.com/p/2pPv3hywPF/
>=20

The message is correct.  An assumption has been made that two devices can't
provide the same GUID in the kernel early on, but this is an incorrect assu=
mption.

We haven't had a situation that we actually need to bind to devices that bo=
th provide
the same GUID so this has never been a priority to solve.