linux-kernel - Re: Dell Latitude E6440 & i8k

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Date:	Sun, 18 May 2014 01:01:09 +0200
From:	Pali Rohár <pali.rohar@...il.com>
To:	Guenter Roeck <linux@...ck-us.net>
Cc:	Jean Delvare <jdelvare@...e.de>, linux-kernel@...r.kernel.org
Subject: Re: Dell Latitude E6440 & i8k

On Saturday 17 May 2014 17:34:34 Guenter Roeck wrote:
> On 05/16/2014 12:23 PM, Pali Rohár wrote:
> > On Friday 16 May 2014 21:11:17 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.
> > 
> > I mean fan RPM & temp4. Those are for sure incorrect.
> > 
> >>> $ 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.
> > 
> > Ok, if driver is developed without any documentation, then
> > it make sense that not working correctly on new machines...
> > 
> > So is not there any documentation? I think that Dell
> > released some SMM/BIOS code... But I'm not sure about it.
> 
> If you find it, please let us know.
> 
> Guenter

Now I remembered... Dell has released info about their smbios
extensions with example programs at:

https://linux.dell.com/libsmbios/main/
https://linux.dell.com/cgi-bin/gitweb/gitweb.cgi?p=libsmbios.git;a=summary

But there is nothing about fan control or temperature.


Also I found smbios specification:

http://www.dmtf.org/standards/smbios

There is something written about fan and temp, but no idea if it
is usefull for something...

-- 
Pali Rohár
pali.rohar@...il.com

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