linux-kernel - Re: 2.6.22 regression: thermal trip points

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Message-Id: <200708031430.26789.lenb@kernel.org>
Date:	Fri, 3 Aug 2007 14:30:26 -0400
From:	Len Brown <lenb@...nel.org>
To:	Knut Petersen <Knut_Petersen@...nline.de>
Cc:	linux-kernel@...r.kernel.org, Andrew Morton <akpm@...l.org>,
	trenn@...e.de, pavel@....cz, mjg59@...f.ucam.org,
	linux-acpi@...r.kernel.org
Subject: Re: 2.6.22 regression: thermal trip points

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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