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

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Message-ID: <516C00EC.8060300@ti.com>
Date:	Mon, 15 Apr 2013 09:30:20 -0400
From:	Eduardo Valentin <eduardo.valentin@...com>
To:	Ville Syrjälä <syrjala@....fi>,
	Jake Edge <jake@....net>, Zhang Rui <rui.zhang@...el.com>,
	"Rafael J. Wysocki" <rjw@...k.pl>,
	"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 13-04-2013 19:46, Ville Syrjälä wrote:
> 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
>


Rui, does this one gets fixed with your series to make the parts of 
thermal framework to be glued together in a single module? Or does this 
one is a new bug?

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