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SubjectRe: Core i7 not scaling frequency down
On Sat, 4 Jul 2009 22:37:32 +0200
Felix von Leitner <felix-linuxkernel@fefe.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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