linux-kernel - Re: [PATCH] hwmon: (dell-smm-hwmon) Disable BIOS fan control on SET

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Date:   Sat, 16 Nov 2019 16:03:10 +0100
From:   Pali Rohár <pali.rohar@...il.com>
To:     Giovanni Mascellani <gio@...ian.org>
Cc:     Jean Delvare <jdelvare@...e.com>,
        Guenter Roeck <linux@...ck-us.net>,
        linux-hwmon@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] hwmon: (dell-smm-hwmon) Disable BIOS fan control on
 SET_FAN

On Thursday 14 November 2019 22:14:08 Giovanni Mascellani wrote:
> +#define I8K_SMM_DISABLE_BIOS	0x30a3
> +#define I8K_SMM_ENABLE_BIOS	0x31a3

In my old notes I have written these two comments:

0x30a3  disable the Fn- key combinations (except the volume functions) key and disable BIOS auto fan control (no args)
0x31a3  enable the Fn- key combinations (except the volume functions) key and enable BIOS auto fan control (no args)

So seems that these two commands have some side effect on some
machines.

For 0x34a3/0x35a3 I have only these comments:

0x34a3  disable BIOS auto fan control (no args)
0x35a3  enable BIOS auto fan control (no args)

-- 
Pali Rohár
pali.rohar@...il.com

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