linux-kernel - Re: [PATCH 3/4] hwmon: (dell-smm) Add support for automatic fan mode

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-ID: <fe494bc6-1e4e-4a81-8a6a-c6fb95160a65@roeck-us.net>
Date: Wed, 24 Sep 2025 07:50:21 -0700
From: Guenter Roeck <linux@...ck-us.net>
To: Armin Wolf <W_Armin@....de>
Cc: pali@...nel.org, linux-hwmon@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH 3/4] hwmon: (dell-smm) Add support for automatic fan mode

On Wed, Sep 17, 2025 at 08:10:35PM +0200, Armin Wolf wrote:
> Many machines treat fan state 3 as some sort of automatic mode,
> which is superior to the separate SMM calls for switching to
> automatic fan mode for two reasons:
> 
> - the fan control mode can be controlled for each fan separately
> - the current fan control mode can be retrieved from the BIOS
> 
> On some machines however, this special fan state does not exist.
> Fan state 3 acts like a regular fan state on such machines or
> does not exist at all. Such machines usually use separate SMM calls
> for enabling/disabling automatic fan control.
> 
> Add support for it. If the machine supports separate SMM calls
> for changing the fan control mode, then the other interface is
> ignored.
> 
> Signed-off-by: Armin Wolf <W_Armin@....de>

Applied.

Guenter