Re: Core i7 not scaling frequency down

[Arjan van de Ven]

On Sat, 4 Jul 2009 22:37:32 +0200
Felix von Leitner <felix-linuxkernel@xxxxxxx> 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
--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/