linux-kernel - Re: [PATCH] acerhdf: Fix fan activation with new thermal governor

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Message-ID: <1361761600.2303.12.camel@rzhang1-mobl4>
Date:	Mon, 25 Feb 2013 11:06:40 +0800
From:	Zhang Rui <rui.zhang@...el.com>
To:	Borislav Petkov <bp@...en8.de>
Cc:	Peter Feuerer <peter@...e.net>,
	LKML <linux-kernel@...r.kernel.org>,
	Durgadoss R <durgadoss.r@...el.com>,
	Borislav Petkov <bp@...e.de>, Andreas Mohr <andi@...as.de>,
	Alexander Lam <azl@...rew.cmu.edu>
Subject: Re: [PATCH] acerhdf: Fix fan activation with new thermal governor

On Sun, 2013-02-24 at 13:09 +0100, Borislav Petkov wrote:
> On Sun, Feb 24, 2013 at 12:42:55PM +0100, Peter Feuerer wrote:
> > Hi Boris,
> > 
> > thanks for your best wishes in the last mail, I'm feeling little better now.
> 
> Nice :)
> 
> > Please test my last patch with the 4 trip points ;) - even if you
> > don't really like it, it is working great! - And to be honest, I still
> > prefer this solution!
> 
> Right, but 4 trip points for this simple driver is a bit of a overkill,
> don't you think? If we want to be really accurate, we'd only need two,
> think of three temperature intervals here:
> 
> 0 - temp <= fanon
> 1 - fanon =< temp < crit
> 2 - temp >= crit
> 
> I need to go stare at it a bit more.
> 
actually, I still do not understand how the two active trip points
mechanism work.

say,
act1 = 50C, act2=60C

when the temperature goes up to 50C, will the fan be turned on or not?

thanks,
rui

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