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hwmon: (dell-smm) Add Dell Precision 3650 Tower to fan control whitelist

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On the Dell Precision 3650 Tower, the EC ignores fan speed writes unless
automatic BIOS fan control is disabled first. The I8K_FAN_30A3_31A3 SMM
code pair works on this machine through the WMI-SMM backend: after
writing 1 to pwm1_enable, all three fans (CPU, front, top) accept the
three fan states and report matching RPM, and writing 2 hands control
back to the BIOS. I8K_FAN_34A3_35A3 was tested as well and also works;
I8K_FAN_30A3_31A3 is used since it matches recent OEM software.

Tested on BIOS 1.48.0 with kernels 7.0.0-30 and 7.0.0-31 (Ubuntu 26.04).

Signed-off-by: Patrick Pepin <patpep@me.com>
Acked-by: Pali Rohár <pali@kernel.org>
Link: https://patch.msgid.link/20260914080955.87925-1-patpep@me.com
Signed-off-by: Guenter Roeck <linux@roeck-us.net>
This commit is contained in:
Patrick Pepin 2026-09-14 08:09:55 +00:00 committed by Guenter Roeck
parent c6ac9f8615
commit e886b6788f
1 changed files with 8 additions and 0 deletions
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8
drivers/hwmon/dell-smm-hwmon.c
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@ -1639,6 +1639,14 @@ static const struct dmi_system_id i8k_whitelist_fan_control[] __initconst = {
},
.driver_data = (void *)&i8k_fan_control_data[I8K_FAN_34A3_35A3],
},
{
.ident = "Dell Precision 3650 Tower",
.matches = {
DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
DMI_EXACT_MATCH(DMI_PRODUCT_NAME, "Precision 3650 Tower"),
},
.driver_data = (void *)&i8k_fan_control_data[I8K_FAN_30A3_31A3],
},
{
.ident = "Dell Optiplex 7090",
.matches = {