linux-kernel - Re: thermal governor: does it actually work??

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Message-ID: <20130219150551.GL26623@pd.tnic>
Date:	Tue, 19 Feb 2013 16:05:51 +0100
From:	Borislav Petkov <bp@...en8.de>
To:	Zhang Rui <rui.zhang@...el.com>
Cc:	Peter Feuerer <peter@...e.net>, Alexander Lam <azl@...rew.cmu.edu>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	Andreas Mohr <andi@...as.de>
Subject: Re: thermal governor: does it actually work??

On Tue, Feb 19, 2013 at 10:51:04PM +0800, Zhang Rui wrote:
> Okay, here I see the problem, say you want to turn on the fan at 60C and
> turn it off at 55C, is this what you want?
> hmmm, is it possible to do some tricks in acerhdf driver?
> say,
> only one active trip point as before. but change acerhdf_get_trip_temp
> to:
> acerhdf_get_trip_temp()
> {
> 	if (fan is on)
> 		return 55;
> 	else
> 		return 60;
> }
> 
> In this way, when the fan is off and the temperature is raising, the fan
> will be turned on at 60C because we have an active trip point of 60C.
> And when the fan is turned on and the temperature starts to drop, the
> fan will be turned off at 55C.

Makes a sense to me. I was questioning the need for 4 trip points too.
We probably would need a second, critical trip point though, just in
case.

Thanks.

-- 
Regards/Gruss,
    Boris.

Sent from a fat crate under my desk. Formatting is fine.
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