linux-kernel - Re: [asus-nb-wmi] thermal device detected by asus-nb-wmi platform driver

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Date:	Sun, 23 Mar 2014 21:15:16 -0700
From:	Guenter Roeck <linux@...ck-us.net>
To:	"Lu, Baolu" <baolu.lu@...ux.intel.com>, linux-acpi@...r.kernel.org
CC:	linux-kernel@...r.kernel.org,
	LM Sensors <lm-sensors@...sensors.org>
Subject: Re: [asus-nb-wmi] thermal device detected by asus-nb-wmi platform
 driver

On 03/20/2014 05:22 PM, Lu, Baolu wrote:
> Hi,
>
> I booted Ubuntu13.10 onto ASUS T100 Tablet and upgraded it with upstream
> kernel (3.14.0-rc7+). There is a thermal device under
> /sys/devices/platform/asus-nb-wmi.
>
> root@...0:~/linux# tree /sys/class/hwmon/
> /sys/class/hwmon/
> ├── hwmon0 -> ../../devices/platform/coretemp.0/hwmon/hwmon0
> └── hwmon1 -> ../../devices/platform/asus-nb-wmi/hwmon/hwmon1
>
> root@...0:/sys/devices/platform/asus-nb-wmi# ls
> cpufv driver hwmon input modalias power subsystem uevent
>
> root@...0:~/linux# sensors
> coretemp-isa-0000
> Adapter: ISA adapter
> Core 0: +38.0°C (high = +90.0°C, crit = +90.0°C)
> Core 1: +38.0°C (high = +90.0°C, crit = +90.0°C)
> Core 2: +39.0°C (high = +90.0°C, crit = +90.0°C)
> Core 3: +38.0°C (high = +90.0°C, crit = +90.0°C)
>
> asus-isa-0000
> Adapter: ISA adapter
> temp1: +6280.0°C
>

Pretty hot ;-). Not your problem, though - it looks like the temperature
is reported in Kelvin and the code converting from Kelvin to degrees C
turns out to be buggy.

> I didn't get any information about thermal interface in
> "Documentation/ABI/testing/sysfs-platform-asus-wmi". Is this a thermal
> sensor? If it's the fact, how can I change the environment so that this
> sensor gives me variable data?
>

I don't think I understand your question. Yes, this is a thermal sensor.
What is it you want to do (in addition to having it report reasonable
temperatures) ?

Guenter

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