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

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Message-ID: <20070802155545.GA3974@ucw.cz>
Date:	Thu, 2 Aug 2007 15:55:45 +0000
From:	Pavel Machek <pavel@....cz>
To:	Andi Kleen <andi@...stfloor.org>
Cc:	Andrew Morton <akpm@...ux-foundation.org>,
	Knut Petersen <Knut_Petersen@...nline.de>,
	linux-kernel@...r.kernel.org, trenn@...e.de, mjg59@...f.ucam.org,
	lenb@...nel.org
Subject: Re: 2.6.22 regression: thermal trip points

Hi!

> > I didn't understand the arguments either, actually.
> 
> The issue is that you can actually kill hardware by setting this wrong.
> We've had such cases where trip point problems eventually lead
> to overheated laptops with hard disks dying etc. 

Actually, that was my machine. Omnibook xe3; BIOS provided trip points
*did* kill the disk. At least I was able to work around it with
writing to trip points.

Yes, ACPI mandates emergency shutdown when critical+delta point is
reached, *in hardware*. So this only endangers very broken machines,
and it also fixes lot of them.

							Pavel
-- 
(english) http://www.livejournal.com/~pavelmachek
(cesky, pictures) http://atrey.karlin.mff.cuni.cz/~pavel/picture/horses/blog.html
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