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hwmon: (dell-smm) Add Dell 16 DC16250 to fan control whitelist

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On the Dell 16 DC16250, the BIOS keeps the CPU fan at its highest state
(~4700 RPM) even when the system is idle at 45 °C, and fan speed writes
through pwm1 are overridden by the BIOS within a few seconds.

The I8K_FAN_30A3_31A3 SMM code pair works on this machine through the
WMI-SMM backend: after writing 1 to pwm1_enable, the fan accepts all
three fan states (0, 128 and 255 via pwm1) and reports matching RPM,
and writing 2 hands control back to the BIOS.

Tested on BIOS 1.8.1 with kernel 7.1.5 (Pop!_OS 24.04).

Assisted-by: claude-opus-5-5
Signed-off-by: Emanuel Ávila <avilaemanueel@gmail.com>
Acked-by: Pali Rohár <pali@kernel.org>
Link: https://patch.msgid.link/20260924044829.2889204-1-avilaemanueel@gmail.com
Signed-off-by: Guenter Roeck <linux@roeck-us.net>
This commit is contained in:
Emanuel Ávila 2026-09-24 01:48:29 -03:00 committed by Guenter Roeck
parent 04f4079ee6
commit f47e067157
1 changed files with 8 additions and 0 deletions
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8
drivers/hwmon/dell-smm-hwmon.c
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@ -1679,6 +1679,14 @@ static const struct dmi_system_id i8k_whitelist_fan_control[] __initconst = {
},
.driver_data = (void *)&i8k_fan_control_data[I8K_FAN_30A3_31A3],
},
{
.ident = "Dell 16 DC16250",
.matches = {
DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
DMI_EXACT_MATCH(DMI_PRODUCT_NAME, "Dell 16 DC16250"),
},
.driver_data = (void *)&i8k_fan_control_data[I8K_FAN_30A3_31A3],
},
{ }
};