linux-kernel - Re: Core i7 not scaling frequency down

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Message-ID: <20090705013001.6e0c17bf@infradead.org>
Date:	Sun, 5 Jul 2009 01:30:01 -0700
From:	Arjan van de Ven <arjan@...radead.org>
To:	Felix von Leitner <felix-linuxkernel@...e.de>
Cc:	Linux Kernel Mailing list <linux-kernel@...r.kernel.org>
Subject: Re: Core i7 not scaling frequency down

On Sat, 4 Jul 2009 22:37:32 +0200
Felix von Leitner <felix-linuxkernel@...e.de> wrote:

> Hi,
> 
> I just got a Nehalem CPU and it works OK except that the fans are
> always running full power and it produces heat like an oven.
> 
>   $ cat /proc/acpi/processor/P001/info
>   processor id:            0
>   acpi id:                 1
>   bus mastering control:   yes
>   power management:        yes
>   throttling control:      no
>   limit interface:         no
>   $
> 
> Oh, no throttling and no limit support?  How can this be?  I'm using
> 2.6.30 but this appears to be bogus; Windows scales down the CPU
> frequency OK.

how do you determine linux isn't scaling down? PowerTOP?
(if not powertop.. you might want to use that ;-)

>   ACPI Warning (tbutils-0246): Incorrect checksum in table [OEMB] -
> 00, should be FE [20090320]

that's pretty bad, but might not be a table critical for C/P states...


-- 
Arjan van de Ven 	Intel Open Source Technology Centre
For development, discussion and tips for power savings, 
visit http://www.lesswatts.org
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