linux-kernel - Re: [PATCH] ACPI: add "auto" to acpi_enforce

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Message-id: <alpine.LFD.2.00.0902040042570.9833@localhost.localdomain>
Date:	Wed, 04 Feb 2009 00:52:06 -0500 (EST)
From:	Len Brown <lenb@...nel.org>
To:	Luca Tettamanti <kronos.it@...il.com>
Cc:	Thomas Renninger <trenn@...e.de>, linux-acpi@...r.kernel.org,
	linux-kernel@...r.kernel.org, Hans de Goede <hdegoede@...hat.com>,
	khali@...ux-fr.org
Subject: Re: [PATCH] ACPI: add "auto" to acpi_enforce_resources

On Thu, 29 Jan 2009, Luca Tettamanti wrote:

> Aside from ASUS the problem is generic since there are two drivers
> poking at the same hardware; for example there are reports of native
> drivers interfering with normal TZ polling (see [1]).

FYI,

While it is slightly off-topic of the (I agree, real)
technical issue here, note that polling is not "normal" on ACPI systems.
[1] was on  SuSE Linux 10.0, which on their own decided to
over-ride the kernel and enable thermal zone polling by default.

This turned out to be a bad idea because it exposed BIOS bugs
in ACPI thermal zones that were never exposed on other operating
systems - evidently because the other operating systems never 
poll thermal zones, they are entirely event driven.

cheers,
Len Brown, Intel Open Source Technology Center

> Luca
> [1] http://www.lm-sensors.org/ticket/2072 and:
> http://thread.gmane.org/gmane.linux.drivers.sensors/12359

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