linux-kernel - Re: i7-2620M: Clock always high when on battery

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Date:	Mon, 7 Jan 2013 15:23:05 -0200
From:	Peter Senna Tschudin <peter.senna@...il.com>
To:	"devendra.aaru" <devendra.aaru@...il.com>
Cc:	Rob Landley <rob@...dley.net>, andre.przywara@....com, rjw@...k.pl,
	linux-kernel@...r.kernel.org
Subject: Re: i7-2620M: Clock always high when on battery

On Tue, Jan 1, 2013 at 6:30 PM, devendra.aaru <devendra.aaru@...il.com> wrote:
> On Tue, Jan 1, 2013 at 3:17 PM, Peter Senna Tschudin
> <peter.senna@...il.com> wrote:
>> I'm not sure if I'm emailing the right people. My problem is with
>> dynamic clock and or power management.
>>
>> I'm using 3.6.10-2.fc17.x86_64 but the exact same problem happen with
>> non Fedora Kernels like 3.7.1 and 3.6.11.
>>
>> I'm using Toshiba R830-10P notebook with i7-2620M cpu.
>>
>> The problem is that when I power on the notebook without the AC
>> adapter the clock of all cores is always very close to 2,7GHz. It was
>> expected that without load the clock would be around 800 Mhz. This
>> issue is causing the notebook to get hot and reduces battery life. The
>> same problem also happens when on AC power but it is uncommon.
>>
>> What can I do to diagnose the problem and collect more precise details?
>>
>
> would you mind trying this
>
> echo ondemand > /sys/devices/system/cpu/cpu0/cpufreq/scaling_governor
>
> as root?
>
> but before cat that file to see whats the current cpu governor.
When I:
$ sudo cat /sys/devices/system/cpu/cpu0/cpufreq/scaling_governor
ondemand

I'm trying to get a Bios update from Toshiba but no success yet.

>
>> Peter
>>
>> --
>> Peter
>> --
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--
Peter
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