From: Len Brown <lenb@kernel.org>
Organization: Intel Open Source Technology Center
To: Knut Petersen <Knut_Petersen@t-online.de>
Subject: Re: 2.6.22 regression: thermal trip points
Date: Fri, 3 Aug 2007 14:30:26 -0400
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Cc: linux-kernel@vger.kernel.org, Andrew Morton <akpm@osdl.org>, trenn@suse.de,
       pavel@ucw.cz, mjg59@srcf.ucam.org, linux-acpi@vger.kernel.org
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On Friday 03 August 2007 08:53, Knut Petersen wrote:
> Len Brown :
> >  
> >
> > Thanks for the sighting, Knut!
> > This regression is dramatic when put in the terms of 50% performance hit!
> > I guess the good news is that thermal throttling is doing the job
> > we are asking it to:-)
> >
> >
> >   
> Thermal management by cpufreq is working really fine ;-)

Unfortunately, I a lot of people don't understand that the ";-)"
after this statement and they really think that cpufreq is a
solution for thermal management.  It isn't.  Systems still
need to be thermally sane when they are fully utilized and
cpufreq helps not.

> My problems are definitely not related to a linux bug. All trip_points
> are fixed, hardcoded in the system BIOS at address 0x000FF810.
> 
> Yes, I could hack  and flash a custom BIOS.
> 
> After reading a lot I think I even could fix the DSDT.

No, you should never have to override your BIOS --
except for debugging.

If Windows works out-of-the-box on this system,
then Linux should too - even if we have to use a DMI-based
workaround for a BIOS bug.

I'm looking forward to seeing the bug report that you are
going to file.  Please include the dmidecode output in addition
to the acpidump output.

thanks,
-Len
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