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

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Message-ID: <CA+MoWDp-smBmTmsjNpgB-_3FFCiqYQ0_u=LxCq5cKDyE9drYAw@mail.gmail.com>
Date:	Fri, 11 Jan 2013 18:21:21 -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

The most strange thing is that this does not happen with Kernel
3.4.25-rc1+... I use Fedora 17 and this happen with Fedora 17 Kernels
and with other 3.6 or newer Kernels. But never happens with Kernel
3.4...

On Mon, Jan 7, 2013 at 3:23 PM, Peter Senna Tschudin
<peter.senna@...il.com> wrote:
> 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
>>> --
>>> To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
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>
>
>
> --
> Peter



-- 
Peter
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