From: Matthew Garrett <mjg59@srcf.ucam.org>
To: Mark Lord <lkml@rtr.ca>
Cc: Pavel Machek <pavel@ucw.cz>,
"Pallipadi, Venkatesh" <venkatesh.pallipadi@intel.com>,
Dave Jones <davej@redhat.com>,
Linux Kernel <linux-kernel@vger.kernel.org>,
Andrew Morton <akpm@osdl.org>
Subject: Re: cpufreq stops working after a while
Date: Thu, 24 Aug 2006 17:15:14 +0100 [thread overview]
Message-ID: <20060824161514.GA19753@srcf.ucam.org> (raw)
In-Reply-To: <44EDBB4C.6040203@rtr.ca>
On Thu, Aug 24, 2006 at 10:44:28AM -0400, Mark Lord wrote:
> By definition, "passive" cooling never needs enabling -- this just refers
> to things like heat sinks and air vents.
In ACPI terms, passive cooling is forced downthrottling of the CPU in
order to reduce heat generation. This is normally done if the
temperature is continuing to rise despite active cooling being enabled.
On some hardware you can set the values at which different types of
cooling will be enabled in /proc/acpi/thermal_zone/*/trip_points. Echo a
colon separated list of values in there to rewrite them. Some BIOSes
will change the trip points in response to various events, which will
then overwrite your values.
--
Matthew Garrett | mjg59@srcf.ucam.org
next prev parent reply other threads:[~2006-08-24 16:15 UTC|newest]
Thread overview: 24+ messages / expand[flat|nested] mbox.gz Atom feed top
2006-08-11 19:55 cpufreq stops working after a while Pallipadi, Venkatesh
2006-08-11 20:29 ` Mark Lord
2006-08-11 20:39 ` Mark Lord
2006-08-11 21:01 ` Dave Jones
2006-08-11 21:09 ` Mark Lord
2006-08-11 21:15 ` Mark Lord
2006-08-11 21:17 ` Mark Lord
2006-08-11 21:25 ` Mark Lord
2006-08-18 15:11 ` Pavel Machek
2006-08-24 14:44 ` Mark Lord
2006-08-24 16:15 ` Matthew Garrett [this message]
-- strict thread matches above, loose matches on Subject: below --
2006-08-11 22:18 Pallipadi, Venkatesh
2006-08-11 21:38 Pallipadi, Venkatesh
2006-08-11 21:53 ` Mark Lord
2006-08-11 21:08 Pallipadi, Venkatesh
2006-08-11 18:25 Mark Lord
2006-08-11 18:39 ` Dave Jones
2006-08-11 19:41 ` Mark Lord
2006-08-11 20:01 ` Mark Lord
2006-08-11 20:12 ` Dave Jones
2006-08-11 18:46 ` Andrew Morton
2006-08-11 19:01 ` Mark Lord
2006-08-11 19:10 ` Mark Lord
2006-08-11 19:18 ` Andrew Morton
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