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

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Date:	Tue, 19 Feb 2013 22:53:32 +0800
From:	Zhang Rui <rui.zhang@...el.com>
To:	Alexander Lam <azl@...rew.cmu.edu>
Cc:	Len Brown <lenb@...nel.org>, linux-kernel@...r.kernel.org,
	Andreas Mohr <andi@...as.de>,
	"R, Durgadoss" <durgadoss.r@...el.com>,
	"peter@...e.net" <peter@...e.net>
Subject: RE: thermal governor: does it actually work??

On Mon, 2013-02-18 at 15:26 -0500, Alexander Lam wrote:
> 
> On Feb 18, 2013 7:11 AM, "Zhang, Rui" <rui.zhang@...el.com> wrote:
> >
> > Sorry I missed that patch.
> >
> > So the problem happens when the acerhdf thermal zone is registered
> when the fan has already been spinning, right?
> 
> Correct, when the acerhdf driver is switched into kernel controlled
> mode and the fan is spinning, it stays spinning until the temperature
> goes above the fan-on trip point and then below the fan-off trip
> point. then the fan shuts off.
> 
> I don't have an opinion on how this is fixed, so do whatever you want
> with my patch. Maybe you should drop it entirely if we do end up
> applying Peter's fix.

> >
> >  
> >
> > Thanks,
> >
> > rui
> >
> >  
> >
> > From: Alexander Lam [mailto:azl@...rew.cmu.edu] 
> > Sent: Sunday, February 17, 2013 4:56 AM
> > To: Andreas Mohr
> > Cc: Zhang, Rui; linux-kernel@...r.kernel.org; R, Durgadoss;
> peter@...e.net; lenb@...nel.org
> > Subject: Re: thermal governor: does it actually work??
> > Importance: High
> >
> >  
> >
> > I wrote a patch to fix this:
> >
> >
> > http://lkml.org/lkml/2012/12/30/47

I think this is the right fix, but I still need to check if there is
some extra work needed before applying it.

thanks,
rui
> >
> > But nobody picked it up and since then I have been too busy to
> respin the patch for new -rc kernels.
> >
> > -Alexander Lam
> >
> > On Fri, Feb 15, 2013 at 10:49 AM, Andreas Mohr <andi@...as.de>
> wrote:
> >
> > Hi,
> >
> >
> > On Fri, Feb 15, 2013 at 09:47:07AM +0000, Zhang, Rui wrote:
> > > Please attach the output of
> > > "grep . /sys/class/thermal/thermal_zone*/cdev*/*"?
> >
> > # grep . /sys/class/thermal/thermal_zone*/cdev*/*
> > /sys/class/thermal/thermal_zone0/cdev0/cur_state:1
> > /sys/class/thermal/thermal_zone0/cdev0/max_state:1
> > grep: /sys/class/thermal/thermal_zone0/cdev0/power: Is a directory
> > grep: /sys/class/thermal/thermal_zone0/cdev0/subsystem: Is a
> directory
> > /sys/class/thermal/thermal_zone0/cdev0/type:acerhdf-fan
> >
> >
> > > The question is that if we can also call it "throttle" when
> reducing the device performance to generate less heat.
> >
> > I won't continue to elaborate on this separate issue now, given that
> my time
> > currently is very limited ;)
> >
> >
> > Andreas Mohr
> > --
> > To unsubscribe from this list: send the line "unsubscribe
> linux-kernel" in
> > the body of a message to majordomo@...r.kernel.org
> > More majordomo info at  http://vger.kernel.org/majordomo-info.html
> > Please read the FAQ at  http://www.tux.org/lkml/
> >
> >  
> 
> -Alexander Lam
> 


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