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SubjectRe: [PATCH v3] Add driver to force WMI Thunderbolt controller power status
(Now in plain text. Sorry about that.)

On Sat, Sep 9, 2017 at 10:09 AM, Mika Westerberg
<> wrote:
> On Fri, Sep 08, 2017 at 10:23:11AM -0500, Mario Limonciello wrote:
>> Current implementations of Intel Thunderbolt controllers will go
>> into a low power mode when not in use.
>> Many machines containing these controllers also have a GPIO wired up
>> that can force the controller awake. This is offered via a ACPI-WMI
>> interface intended to be manipulated by a userspace utility.
>> This mechanism is provided by Intel to OEMs to include in BIOS.
>> It uses an industry wide GUID that is populated in a separate _WDG
>> entry with no binary MOF.
>> This interface allows software such as fwupd to wake up thunderbolt
>> controllers to query the firmware version or flash new firmware.
>> Signed-off-by: Mario Limonciello <>
> Reviewed-by: Mika Westerberg <>


Reviewed-by: Yehezkel Bernat <>

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