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

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Message-ID: <20140522123252.GF12759@t520.home>
Date:	Thu, 22 May 2014 09:33:12 -0300
From:	Flavio Leitner <fbl@...hat.com>
To:	Guenter Roeck <linux@...ck-us.net>
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 Wed, May 21, 2014 at 10:36:45PM -0700, Guenter Roeck wrote:
> 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.

Sure. I will do that. I didn't want to change anything else besides
the speed level and that is what sensors reports by default.

> >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 ?

Up to 4 which did nothing that I could notice.
No difference regarding to noise or temp or rpm.

fbl
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