Re: [PATCH] hwmon: (dell-smm) Add XPS 15 L502X to fan control blacklist

["Pali Rohár" <pali@kernel.org>]

On Saturday 23 January 2021 18:46:08 Thomas Hebb wrote:
> It has been reported[0] that the Dell XPS 15 L502X exhibits similar
> freezing behavior to the other systems[1] on this blacklist. The issue
> was exposed by a prior change of mine to automatically load
> dell_smm_hwmon on a wider set of XPS models. To fix the regression, add
> this model to the blacklist.
> 
> [0] https://bugzilla.kernel.org/show_bug.cgi?id=211081
> [1] https://bugzilla.kernel.org/show_bug.cgi?id=195751
> 
> Fixes: b8a13e5e8f37 ("hwmon: (dell-smm) Use one DMI match for all XPS models")
> Cc: stable@vger.kernel.org
> Reported-by: Bob Hepple <bob.hepple@gmail.com>
> Tested-by: Bob Hepple <bob.hepple@gmail.com>
> Signed-off-by: Thomas Hebb <tommyhebb@gmail.com>
> ---
> 
>  drivers/hwmon/dell-smm-hwmon.c | 7 +++++++
>  1 file changed, 7 insertions(+)
> 
> diff --git a/drivers/hwmon/dell-smm-hwmon.c b/drivers/hwmon/dell-smm-hwmon.c
> index ec448f5f2dc3..73b9db9e3aab 100644
> --- a/drivers/hwmon/dell-smm-hwmon.c
> +++ b/drivers/hwmon/dell-smm-hwmon.c
> @@ -1159,6 +1159,13 @@ static struct dmi_system_id i8k_blacklist_fan_support_dmi_table[] __initdata = {
>  			DMI_EXACT_MATCH(DMI_PRODUCT_NAME, "XPS13 9333"),
>  		},
>  	},
> +	{
> +		.ident = "Dell XPS 15 L502X",
> +		.matches = {
> +			DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
> +			DMI_EXACT_MATCH(DMI_PRODUCT_NAME, "Dell System XPS L502X"),

Hello! Are you sure that it is required to completely disable fan
support? And not only access to fan type label for which is different
blaclist i8k_blacklist_fan_type_dmi_table?

And have you reported this issue to Dell support?

> +		},
> +	},
>  	{ }
>  };
>  
> -- 
> 2.30.0
>