From: Dave Jones <davej@redhat.com>
To: "Rafał Bilski" <rafalbilski@interia.pl>
Cc: Axel Lin <axel.lin@gmail.com>,
linux-kernel@vger.kernel.org, cpufreq@vger.kernel.org
Subject: Re: [PATCH] e_powersaver: Underclock checks
Date: Wed, 13 Jul 2011 12:45:30 -0400 [thread overview]
Message-ID: <20110713164529.GA1652@redhat.com> (raw)
In-Reply-To: <4E1DCA76.7090809@interia.pl>
On Wed, Jul 13, 2011 at 05:40:22PM +0100, Rafał Bilski wrote:
>
> >Some systems are using 1.2GHz@844mV processors running at 600MHz@796mV.
> OK. That's strange. It is 1,2GHz system. Can both ACPI p-states and "e_powersaver"
> drivers be running at the same time?
no
> Can BIOS change processor frequencies without
> Linux knowing and without p-states driver loaded?
yes. Usually via SMI. some laptops do this when switching between power/battery,
and/or when overheating.
cpufreq usually detects when this happens and logs messages.
Dave
WARNING: multiple messages have this Message-ID (diff)
From: Dave Jones <davej@redhat.com>
To: "Rafał Bilski" <rafalbilski@interia.pl>
Cc: Axel Lin <axel.lin@gmail.com>,
linux-kernel@vger.kernel.org, cpufreq@vger.kernel.org
Subject: Re: [PATCH] e_powersaver: Underclock checks
Date: Wed, 13 Jul 2011 12:45:30 -0400 [thread overview]
Message-ID: <20110713164529.GA1652@redhat.com> (raw)
In-Reply-To: <4E1DCA76.7090809@interia.pl>
On Wed, Jul 13, 2011 at 05:40:22PM +0100, Rafał Bilski wrote:
>
> >Some systems are using 1.2GHz@844mV processors running at 600MHz@796mV.
> OK. That's strange. It is 1,2GHz system. Can both ACPI p-states and "e_powersaver"
> drivers be running at the same time?
no
> Can BIOS change processor frequencies without
> Linux knowing and without p-states driver loaded?
yes. Usually via SMI. some laptops do this when switching between power/battery,
and/or when overheating.
cpufreq usually detects when this happens and logs messages.
Dave
next prev parent reply other threads:[~2011-07-13 16:45 UTC|newest]
Thread overview: 17+ messages / expand[flat|nested] mbox.gz Atom feed top
2011-07-08 8:37 [RFC][PATCH] cpufreq: e_powersaver: Fix checking brand for EPS_BRAND_C3 Axel Lin
2011-07-11 16:36 ` Rafał Bilski
2011-07-11 16:36 ` Rafał Bilski
2011-07-11 22:08 ` [PATCH] e_powersaver: Add sanity checks to code provided by VIA Rafał Bilski
2011-07-11 22:08 ` Rafał Bilski
2011-07-11 23:15 ` [PATCH] e_powersaver: Underclock checks Rafał Bilski
2011-07-11 23:15 ` Rafał Bilski
2011-07-11 23:25 ` Dave Jones
2011-07-11 23:25 ` Dave Jones
2011-07-12 17:00 ` Rafał Bilski
2011-07-12 17:00 ` Rafał Bilski
2011-07-13 16:40 ` Rafał Bilski
2011-07-13 16:40 ` Rafał Bilski
2011-07-13 16:45 ` Dave Jones [this message]
2011-07-13 16:45 ` Dave Jones
2011-07-13 22:24 ` [PATCH] e_powersaver: Add sanity checks to code provided by VIA Dave Jones
2011-07-13 23:01 ` Rafał Bilski
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