linux-kernel - Re: 2.6.22-rc1-mm1 [cannot change thermal trip points]

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Message-ID: <464C5A62.6060604@gmail.com>
Date:	Thu, 17 May 2007 15:36:34 +0200
From:	Maciej Rutecki <maciej.rutecki@...il.com>
To:	Pavel Machek <pavel@....cz>
CC:	Chuck Ebbert <cebbert@...hat.com>, len.brown@...el.com,
	Andrew Morton <akpm@...ux-foundation.org>,
	linux-kernel@...r.kernel.org, linux-acpi@...r.kernel.org,
	torvalds@...ux-foundation.org
Subject: Re: 2.6.22-rc1-mm1 [cannot change thermal trip points]

Pavel Machek pisze:

> What was the rationale? Can we get this one reverted? 
> 
> Some machines (HP omnibook xe3) have broken trip points -- too high --
> so machine will overheat and trigger hw shutdown before starting
> passive cooling.
> 
> That's really broken, and write to trip points is reasonable way to
> 'fix' that. (I'd understand if you only ever let trip points to
> decrease... but otoh root should be able to shoot himself....)
> 
> 							Pavel

Many people need change trippoints, for example I have:

cat /proc/acpi/thermal_zone/TZ0/trip_points  | grep critical
critical (S5):           256 C

I _must_ change it to below 105 C, or edit DSDT table (too difficult to
me). I cannot use this kernel, when trip points are read only.

-- 
Maciej Rutecki
www.unixy.pl
Kernel Monkeys
(http://kernel.wikidot.com/)


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