linux-kernel - Re: still in 3.9-rc6 - fan speed at 100% after suspend/resume regression

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Date:	Sun, 14 Apr 2013 02:46:46 +0300
From:	Ville Syrjälä <syrjala@....fi>
To:	Jake Edge <jake@....net>, Zhang Rui <rui.zhang@...el.com>,
	"Rafael J. Wysocki" <rjw@...k.pl>,
	Eduardo Valentin <eduardo.valentin@...com>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	Roberto Oppedisano <roberto.oppedisano@...il.com>,
	Salvatore Sisinni <s.sisinni@...il.com>, auxsvr@...il.com
Subject: Re: still in 3.9-rc6 - fan speed at 100% after suspend/resume
 regression

On Sun, Apr 14, 2013 at 12:44:00AM +0300, Ville Syrjälä wrote:
> On Sat, Apr 13, 2013 at 10:02:21AM -0600, Jake Edge wrote:
> > Hi Zhang Rui,
> > 
> > The problem reported in https://lkml.org/lkml/2012/12/4/428 (and
> > incorrectly attributed to a suspend patch by me here:
> > https://lkml.org/lkml/2013/4/12/314) still exists in 3.9-rc6, at least
> > for my HP/Compaq 2510p laptop. It appeared that some folks were seeing
> > some improvement with earlier 3.9-rcs (?) but I just tested rc6 and saw
> > substantially the same behavior.  This all works fine in <= 3.6.11.
> > 
> > A brief recap: after resuming, the fan on the laptop spins up to full
> > speed and stays there. "temp6" in "acpitz-virtual-0" (as shown by
> > "sensors") is 100°C and stays there, which is presumably what is making
> > the fan stay on.
> 
> My HP Compaq NC6000 exhibits slightly different behaviour. For me the
> reported temp is always accurate but the trip points get out of sync
> with the actual temperature.
> 
> With 3.7 I saw two different kinds of problems coming out of resume.
> In one case the fan stays on until the temp rises high enough to get the
> trip points back into sync. In the other case the fan goes off, and stays
> off even when the temperature rises above the highest active trip point,
> but it does appear to get back into sync when the temp starts to come back
> down. I think the difference might stem from resuming when the laptop has
> cooled down fully vs. when it's still warm.
> 
> I also just tried 3.9-rc6, and that one appears to behave differently
> to 3.7, but still wrong. There the fan goes off after resume, and comes
> back on as the temperature rises, but it never slows back down after
> that.
> 
> I'll try to collect some more detailed dumps of all three cases.

I filed a new bug and attached all my logs:
https://bugzilla.kernel.org/show_bug.cgi?id=56591

-- 
Ville Syrjälä
syrjala@....fi
http://www.sci.fi/~syrjala/
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