linux-kernel - Re: Dell Latitude E6440 & i8k

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Message-ID: <20140516211117.0c766287@endymion.delvare>
Date:	Fri, 16 May 2014 21:11:17 +0200
From:	Jean Delvare <jdelvare@...e.de>
To:	Pali Rohár <pali.rohar@...il.com>
Cc:	Guenter Roeck <linux@...ck-us.net>, linux-kernel@...r.kernel.org
Subject: Re: Dell Latitude E6440 & i8k

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.

Add the following to /etc/sensors.d/i8k.conf:

chip "i8k-virtual-0"

   label fan2 "Left Fan"
   ignore temp4

-- 
Jean Delvare
SUSE L3 Support
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