linux-kernel - Re: regression in linux 3.7 - fan speed at 100% after suspend/resume at 100%

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Message-ID: <1354630272.2480.4.camel@rzhang1-mobl4>
Date:	Tue, 04 Dec 2012 22:11:12 +0800
From:	Zhang Rui <rui.zhang@...el.com>
To:	Roberto Oppedisano <roberto.oppedisano@...il.com>
Cc:	LKML <linux-kernel@...r.kernel.org>,
	"Rafael J. Wysocki" <rjw@...k.pl>, eduardo.valentin@...com
Subject: Re: regression in linux 3.7 - fan speed at 100% after
 suspend/resume at 100%

Hi, Roberto,

please attach the acpidump output.

On Tue, 2012-12-04 at 13:57 +0100, Roberto Oppedisano wrote:
> Hello,
>      with recent kernels after a suspend/resume cycle on my laptop (HP 
> 6730b) the fans stays at full speed.
does the fan keep running at full speed after resume?

please attach the output of "grep . /sys/class/thermal/*/*" before
suspend and when the fan is running at full speed.
please attach the same stuff in a good kernel.


thanks,
rui


> I've bisected down to this commit:
> 
> ce119f83257aae29b84a5bfad0669e8348437b18 is the first bad commit
> commit ce119f83257aae29b84a5bfad0669e8348437b18
> Author: Zhang Rui <rui.zhang@...el.com>
> Date:   Wed Jun 27 14:13:04 2012 +0800
> 
>      Thermal: Introduce simple arbitrator for setting device cooling state
> 
>      This fixes the problem that a cooling device may be referenced by
>      by multiple trip points in multiple thermal zones.
> 
>      With this patch, we have two stages for updating a thermal zone,
>      1. check if a thermal_instance needs to be updated or not
>      2. update the cooling device, based on the target cooling state
>         of all its instances.
> 
>      Note that, currently, the cooling device is set to the deepest
>      cooling state required.
> 
>      Signed-off-by: Zhang Rui <rui.zhang@...el.com>
>      Reviewed-by: Rafael J. Wysocki <rjw@...k.pl>
>      Reviewed-by: Eduardo Valentin <eduardo.valentin@...com>
> 
> :040000 040000 8469b057ee5b33bdb264624db35c951d0ecdb66b 
> d7288437cff3c7437e59144c46c04c78669a597b M      drivers
> :040000 040000 397296161d55c825f07501470130928d226497cc 
> f715fd1770dd33fd333c5fa339e740537b2a916f M      include
> 
> I tried to revert it but there are rejects so I cold not try current 
> kernel with simply this commit removed.
> 
> As a side note when the fan is at full speed a see an anomaly on thermal 
> indicator #4
> 
> $ grep 0 /sys/devices/virtual/thermal/thermal_zone*/temp
> /sys/devices/virtual/thermal/thermal_zone0/temp:59000
> /sys/devices/virtual/thermal/thermal_zone1/temp:63000
> /sys/devices/virtual/thermal/thermal_zone2/temp:48000
> /sys/devices/virtual/thermal/thermal_zone3/temp:27900
> /sys/devices/virtual/thermal/thermal_zone4/temp:100000
> 
> while the others seem to report normal value. Attached the output of 
> dmesg on this laptop.
> 
> More info/testing on request.
> 
> Kind regards
> R


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