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

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Message-ID: <20090204060513.GA28321@srcf.ucam.org>
Date:	Wed, 4 Feb 2009 06:05:13 +0000
From:	Matthew Garrett <mjg@...hat.com>
To:	Len Brown <lenb@...nel.org>
Cc:	Luca Tettamanti <kronos.it@...il.com>,
	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 Wed, Feb 04, 2009 at 12:52:06AM -0500, Len Brown wrote:

> 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.

Checking the DSDTs I have to hand, it seems that polling is expected on 
about 5% of systems via an explicit _TZP and on almost all machines via 
_TSP. Even on systems where thermal notifications are provided, it's 
still up to the OS to poll the zone to find the current temperature and 
take appropriate action. There's still a window for native smbus drivers 
to screw everything up.

-- 
Matthew Garrett | mjg59@...f.ucam.org
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