linux-kernel - acer-wmi WMID_gaming_set_fan

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Message-ID: <051c9272-b466-477d-9b7c-2d3a635053a2@gmx.de>
Date: Mon, 23 Dec 2024 22:18:56 +0100
From: Armin Wolf <W_Armin@....de>
To: jafar.akhoondali@...il.com
Cc: Lee Chun-Yi <jlee@...e.com>, Hans de Goede <hdegoede@...hat.com>,
 Ilpo Järvinen <ilpo.jarvinen@...ux.intel.com>,
 "platform-driver-x86@...r.kernel.org" <platform-driver-x86@...r.kernel.org>,
 LKML <linux-kernel@...r.kernel.org>
Subject: acer-wmi WMID_gaming_set_fan_mode() behaviour

Hi,

i am currently working on adding fan control to support for the acer-wmi driver. So far
i can already control the fans using a hwmon interface, but support for switching between
manual and automatic mode is missing.

Switching from automatic to manual mode seems to be straight-forward: using WMI method 16
to set the fan speed seems to automatically switch to manual control mode.

However switching back to automatic mode uses a different mechanism. Since you are the author
of the WMID_gaming_set_fan_mode() function i wanted to ask you how the function exactly works.

In the end i hope to use this function to switch fans back to automatic mode. By the way i also
found a way to automatically detect the number of CPU and GPU fans for each machine, so maybe
we can get rid of the quirk entries for that.

Thanks,
Armin Wolf