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From: Thomas Renninger <trenn@suse.de>
To: "Ferdinand Hübner" <fh@cvmx.org>
Cc: cpufreq@lists.linux.org.uk
Subject: Re: CPU-Frequency limited to lowest available frequency while	under load
Date: Thu, 01 Nov 2007 19:31:18 +0100	[thread overview]
Message-ID: <1193941879.4202.17.camel@noname> (raw)
In-Reply-To: <472A15FF.5040504@cvmx.org>

Hi Ferdinand,

I cut down the mail a bit...
On Thu, 2007-11-01 at 19:07 +0100, Ferdinand Hübner wrote:
> Thomas Renninger wrote:
> 
> > It can be:
> >  1) frequency limited by BIOS through _PPC
> >  2) frequency reduced by thermal passive limit
> >  3) some really odd cpufreq core bug
> > 
> >>From the last bugs occurring in this area I expect it's 1.

> I repeated the test a couple of times and the _PPC values have always
> been 0 except for the last test I did. The value was 3 in the last test.
> Does that mean that the BIOS is partially responsible?
If the value is 3, the highest three freqs are not allowed by BIOS.
This may be intended, probably not.

IMO best is you open a bug at http://bugzilla.kernel.org to collect info
at one place..., for now I'd assign it to the ACPI component.

acpidump output should be most important atm, pls attach it there and
take me into CC list.

Is it possible for you to reproduce this easily?
Maybe something you noticed like: it always happens after x mins or
after loading module y...
You could also try to not load other ACPI modules: battery, thermal,
button, fan, ac.
Maybe it does not happen then anymore?

Do you use hwmon, thermal sensor modules?

   Thomas


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  reply	other threads:[~2007-11-01 18:31 UTC|newest]

Thread overview: 6+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2007-10-30 10:23 CPU-Frequency limited to lowest available frequency while under load Ferdinand Hübner
2007-10-31 13:28 ` Thomas Renninger
2007-11-01 18:07   ` Ferdinand Hübner
2007-11-01 18:31     ` Thomas Renninger [this message]
2007-11-01 18:36       ` Jarod Wilson
2007-11-06 16:01         ` Ferdinand Hübner

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