* Re: [PATCH] hwmon: (dell-smm) Add Dell Precision 3650 Tower to fan control whitelist
2026-09-13 11:29 [PATCH] hwmon: (dell-smm) Add Dell Precision 3650 Tower to fan control whitelist Patrick Pepin
@ 2026-09-13 11:32 ` sashiko-bot
2026-09-13 11:35 ` Pali Rohár
` (2 subsequent siblings)
3 siblings, 0 replies; 8+ messages in thread
From: sashiko-bot @ 2026-09-13 11:32 UTC (permalink / raw)
To: Patrick Pepin; +Cc: linux-hwmon
> On the Dell Precision 3650 Tower, the EC ignores fan speed writes unless
> automatic BIOS fan control is disabled first. The same SMM code pair as
> the OptiPlex 7000 (I8K_FAN_34A3_35A3) 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.
>
> 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>
Sashiko has reviewed this patch and found no issues. It looks great!
--
Sashiko AI review · https://sashiko.dev/#/patchset/20260913112925.11393-1-patpep@me.com?part=1
^ permalink raw reply [flat|nested] 8+ messages in thread* Re: [PATCH] hwmon: (dell-smm) Add Dell Precision 3650 Tower to fan control whitelist
2026-09-13 11:29 [PATCH] hwmon: (dell-smm) Add Dell Precision 3650 Tower to fan control whitelist Patrick Pepin
2026-09-13 11:32 ` sashiko-bot
@ 2026-09-13 11:35 ` Pali Rohár
2026-09-13 20:16 ` Armin Wolf
2026-09-14 8:09 ` [PATCH v2] " Patrick Pepin
3 siblings, 0 replies; 8+ messages in thread
From: Pali Rohár @ 2026-09-13 11:35 UTC (permalink / raw)
To: Patrick Pepin; +Cc: Guenter Roeck, Armin Wolf, linux-hwmon, linux-kernel
On Sunday 13 September 2026 11:29:25 Patrick Pepin wrote:
> On the Dell Precision 3650 Tower, the EC ignores fan speed writes unless
> automatic BIOS fan control is disabled first. The same SMM code pair as
> the OptiPlex 7000 (I8K_FAN_34A3_35A3) 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.
>
> 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>
> ---
> drivers/hwmon/dell-smm-hwmon.c | 8 ++++++++
> 1 file changed, 8 insertions(+)
>
> diff --git a/drivers/hwmon/dell-smm-hwmon.c b/drivers/hwmon/dell-smm-hwmon.c
> index 7ed94a3db..47668634f 100644
> --- a/drivers/hwmon/dell-smm-hwmon.c
> +++ b/drivers/hwmon/dell-smm-hwmon.c
> @@ -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_34A3_35A3],
> + },
> {
> .ident = "Dell Optiplex 7090",
> .matches = {
> --
> 2.53.0
>
^ permalink raw reply [flat|nested] 8+ messages in thread* Re: [PATCH] hwmon: (dell-smm) Add Dell Precision 3650 Tower to fan control whitelist
2026-09-13 11:29 [PATCH] hwmon: (dell-smm) Add Dell Precision 3650 Tower to fan control whitelist Patrick Pepin
2026-09-13 11:32 ` sashiko-bot
2026-09-13 11:35 ` Pali Rohár
@ 2026-09-13 20:16 ` Armin Wolf
2026-09-14 8:09 ` [PATCH v2] " Patrick Pepin
3 siblings, 0 replies; 8+ messages in thread
From: Armin Wolf @ 2026-09-13 20:16 UTC (permalink / raw)
To: Patrick Pepin, Pali Rohár, Guenter Roeck; +Cc: linux-hwmon, linux-kernel
Am 13.09.26 um 13:29 schrieb Patrick Pepin:
> On the Dell Precision 3650 Tower, the EC ignores fan speed writes unless
> automatic BIOS fan control is disabled first. The same SMM code pair as
> the OptiPlex 7000 (I8K_FAN_34A3_35A3) 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.
>
> Tested on BIOS 1.48.0 with kernels 7.0.0-30 and 7.0.0-31 (Ubuntu 26.04).
Hi,
can you try if I8K_FAN_30A3_31A3 works too? Those are the commands used by
recent releases of the OEM software, so i would prefer using them.
Thanks,
Armin Wolf
> Signed-off-by: Patrick Pepin <patpep@me.com>
> ---
> drivers/hwmon/dell-smm-hwmon.c | 8 ++++++++
> 1 file changed, 8 insertions(+)
>
> diff --git a/drivers/hwmon/dell-smm-hwmon.c b/drivers/hwmon/dell-smm-hwmon.c
> index 7ed94a3db..47668634f 100644
> --- a/drivers/hwmon/dell-smm-hwmon.c
> +++ b/drivers/hwmon/dell-smm-hwmon.c
> @@ -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_34A3_35A3],
> + },
> {
> .ident = "Dell Optiplex 7090",
> .matches = {
^ permalink raw reply [flat|nested] 8+ messages in thread* [PATCH v2] hwmon: (dell-smm) Add Dell Precision 3650 Tower to fan control whitelist
2026-09-13 11:29 [PATCH] hwmon: (dell-smm) Add Dell Precision 3650 Tower to fan control whitelist Patrick Pepin
` (2 preceding siblings ...)
2026-09-13 20:16 ` Armin Wolf
@ 2026-09-14 8:09 ` Patrick Pepin
2026-09-14 8:20 ` sashiko-bot
` (2 more replies)
3 siblings, 3 replies; 8+ messages in thread
From: Patrick Pepin @ 2026-09-14 8:09 UTC (permalink / raw)
To: Pali Rohár, Guenter Roeck
Cc: Armin Wolf, linux-hwmon, linux-kernel, Patrick Pepin
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>
---
v2: use I8K_FAN_30A3_31A3 instead of I8K_FAN_34A3_35A3 as suggested by
Armin Wolf (both pairs tested working on this machine). Pali's
Acked-by from v1 is not carried over because of this change.
drivers/hwmon/dell-smm-hwmon.c | 8 ++++++++
1 file changed, 8 insertions(+)
diff --git a/drivers/hwmon/dell-smm-hwmon.c b/drivers/hwmon/dell-smm-hwmon.c
index 7ed94a3db..99a58ed26 100644
--- a/drivers/hwmon/dell-smm-hwmon.c
+++ b/drivers/hwmon/dell-smm-hwmon.c
@@ -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 = {
--
2.53.0
^ permalink raw reply related [flat|nested] 8+ messages in thread* Re: [PATCH v2] hwmon: (dell-smm) Add Dell Precision 3650 Tower to fan control whitelist
2026-09-14 8:09 ` [PATCH v2] " Patrick Pepin
@ 2026-09-14 8:20 ` sashiko-bot
2026-09-14 9:46 ` Pali Rohár
2026-09-16 14:53 ` Guenter Roeck
2 siblings, 0 replies; 8+ messages in thread
From: sashiko-bot @ 2026-09-14 8:20 UTC (permalink / raw)
To: Patrick Pepin; +Cc: linux-hwmon
> 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>
Sashiko has reviewed this patch and found no issues. It looks great!
--
Sashiko AI review · https://sashiko.dev/#/patchset/20260914080955.87925-1-patpep@me.com?part=1
^ permalink raw reply [flat|nested] 8+ messages in thread
* Re: [PATCH v2] hwmon: (dell-smm) Add Dell Precision 3650 Tower to fan control whitelist
2026-09-14 8:09 ` [PATCH v2] " Patrick Pepin
2026-09-14 8:20 ` sashiko-bot
@ 2026-09-14 9:46 ` Pali Rohár
2026-09-16 14:53 ` Guenter Roeck
2 siblings, 0 replies; 8+ messages in thread
From: Pali Rohár @ 2026-09-14 9:46 UTC (permalink / raw)
To: Patrick Pepin; +Cc: Guenter Roeck, Armin Wolf, linux-hwmon, linux-kernel
On Monday 14 September 2026 08:09:55 Patrick Pepin wrote:
> 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>
> ---
> v2: use I8K_FAN_30A3_31A3 instead of I8K_FAN_34A3_35A3 as suggested by
> Armin Wolf (both pairs tested working on this machine). Pali's
> Acked-by from v1 is not carried over because of this change.
>
> drivers/hwmon/dell-smm-hwmon.c | 8 ++++++++
> 1 file changed, 8 insertions(+)
>
> diff --git a/drivers/hwmon/dell-smm-hwmon.c b/drivers/hwmon/dell-smm-hwmon.c
> index 7ed94a3db..99a58ed26 100644
> --- a/drivers/hwmon/dell-smm-hwmon.c
> +++ b/drivers/hwmon/dell-smm-hwmon.c
> @@ -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 = {
> --
> 2.53.0
>
^ permalink raw reply [flat|nested] 8+ messages in thread* Re: [PATCH v2] hwmon: (dell-smm) Add Dell Precision 3650 Tower to fan control whitelist
2026-09-14 8:09 ` [PATCH v2] " Patrick Pepin
2026-09-14 8:20 ` sashiko-bot
2026-09-14 9:46 ` Pali Rohár
@ 2026-09-16 14:53 ` Guenter Roeck
2 siblings, 0 replies; 8+ messages in thread
From: Guenter Roeck @ 2026-09-16 14:53 UTC (permalink / raw)
To: Patrick Pepin; +Cc: Pali Rohár, Armin Wolf, linux-hwmon, linux-kernel
On Mon, Sep 14, 2026 at 08:09:55AM +0000, Patrick Pepin wrote:
> 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>
Applied.
Thanks,
Guenter
^ permalink raw reply [flat|nested] 8+ messages in thread