From: Henrique de Moraes Holschuh <hmh@hmh.eng.br>
To: Zhao Yakui <yakui.zhao@intel.com>
Cc: Florian Echtler <floe@butterbrot.org>,
"linux-acpi@vger.kernel.org" <linux-acpi@vger.kernel.org>
Subject: Re: Fan running continuously after kernel switch
Date: Fri, 16 Jan 2009 19:23:26 -0200 [thread overview]
Message-ID: <20090116212326.GE5719@khazad-dum.debian.net> (raw)
In-Reply-To: <1232088736.4001.6.camel@yakui_zhao.sh.intel.com>
On Fri, 16 Jan 2009, Zhao Yakui wrote:
> On Thu, 2009-01-15 at 17:32 +0800, Florian Echtler wrote:
> > > > yesterday, I switched from kernel 2.6.25-gentoo-r8 to 2.6.27-gentoo-r7
> > > Please attach the output of acpidump so that we can confirm whether the
> > > fan device is controlled by thinkpad acpi driver or generic fan driver.
> > Dumpfile is attached.
> thanks for the acpidump.
> >From the dumpfile it seems that the fan is not controlled by the generic
> ACPI fan driver. It seems that it is controlled by thinkpad_acpi driver.
> cc: Henrique de Moraes Holschuh <hmh@hmh.eng.br>
The thinkpad-acpi driver exports an interface that can be used to control
the fan, but you do it on your own risk, and you have to EXPLICLTY opt-in by
giving it the fan_control=1 parameter.
Even if you do give thinkpad-acpi the fan_control=1 parameter, it won't
touch the fan at all unless you command it to through procfs or sysfs.
The driver doesn't do any sort of automated control, the EC does it by
itself.
What can help is for you to tell us the temperatures that thinkpad-acpi
report. If any of them is above 43C, the fan will be left on continuously
by the EC.
--
"One disk to rule them all, One disk to find them. One disk to bring
them all and in the darkness grind them. In the Land of Redmond
where the shadows lie." -- The Silicon Valley Tarot
Henrique Holschuh
next prev parent reply other threads:[~2009-01-16 21:23 UTC|newest]
Thread overview: 6+ messages / expand[flat|nested] mbox.gz Atom feed top
2009-01-15 8:42 Fan running continuously after kernel switch Florian Echtler
2009-01-15 9:29 ` Zhao Yakui
[not found] ` <1232011930.24218.13.camel@pancake>
2009-01-16 6:52 ` Zhao Yakui
2009-01-16 21:23 ` Henrique de Moraes Holschuh [this message]
2009-01-16 22:04 ` Florian Echtler
2009-01-16 22:22 ` Henrique de Moraes Holschuh
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