linux-kernel - Re: [PATCH] i8k: increase fan limit to 3

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Message-ID: <537D8CED.4000603@roeck-us.net>
Date:	Wed, 21 May 2014 22:36:45 -0700
From:	Guenter Roeck <linux@...ck-us.net>
To:	Flavio Leitner <fbl@...hat.com>
CC:	linux-kernel@...r.kernel.org, Arnd Bergmann <arnd@...db.de>,
	Flavio Leitner <fbl@...close.org>
Subject: Re: [PATCH] i8k: increase fan limit to 3

On 05/21/2014 08:45 PM, Flavio Leitner wrote:
> On Wed, May 21, 2014 at 08:32:24PM -0700, Guenter Roeck wrote:
>> On 05/21/2014 07:19 PM, Flavio Leitner wrote:
>>> From: Flavio Leitner <fbl@...close.org>
>>>
>>> It is possible to increase left fan speed on a
>>> DELL Precision 490n system up to 3.
>>>
>>>      value    fan rpm
>>>        1      35460
>>>        2      64740
>>>        3      78510
>>>
>> Guess the speed factor 30 doesn't apply here.
>
> Those are actual rpms, not just a multiplied rpm. What I mean
> is that you can hear the fan spinning up or down and the
> temperature going up or down accordingly.
>
I don't think there are any fans running at 78k rpm. The real speed
is 78,510 / 30 or 2,617 rpm. You should set the fan_mult module
parameter to 1 for your system.

> But even setting it to 3 is not enough to spin at maximum
> speed. Anyway, now I can load the system without the FBDIMM
> going above 75oC.
>
Did you try to set higher values ?

Guenter

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