linux-kernel - Re: Dell Latitude E6440 & i8k

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Date:	Sat, 17 May 2014 08:25:38 -0700
From:	Guenter Roeck <linux@...ck-us.net>
To:	Jean Delvare <jdelvare@...e.de>,
	Pali Rohár <pali.rohar@...il.com>
CC:	linux-kernel@...r.kernel.org
Subject: Re: Dell Latitude E6440 & i8k

On 05/16/2014 12:11 PM, Jean Delvare wrote:
> Hi Pali,
>
> On Fri, 16 May 2014 20:37:41 +0200, Pali Rohár wrote:
>> Hello,
>>
>> on Dell Latitude E6440 driver i8k reporting total nonsense values
>
> That's kind of excessive wording, the output isn't that bad.
>
>> $ sensors
>> i8k-virtual-0
>> Adapter: Virtual device
>> Right Fan:   93450 RPM
>> CPU:          +57.0°C
>> temp2:        +57.0°C
>> temp3:        +40.0°C
>> temp4:       +127.0°C
>>
>> Right Fan and temp4 are for sure incorrect.
>
> Driver is reverse-engineered so this is best effort and some tweaking
> may be needed.
>
>> Value temp4 is always 127 and is never changing, but value for
>> Right Fan is increasing when fan is more noisy. So it looks like
>> value for Right Fan is not correctly normalized or multiplier is
>> incorrect.
>>
>> And name "Right" is incorrect too. Fan is on left side of this
>> notebook, not right as reported by driver.
>>
>> It is possible to fix these problems?
>
> Load the i8k driver with fan_mult=1.
>

Would it make sense to change the default multiplier to 1 ?
Lots of people have problems with it, and trying to figure out
affected machines one by one would be an all but impossible task.

Guenter


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