linux-kernel - Re: [PATCH] Enable speedstep for sonoma processors.

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Date:	Wed, 4 Jun 2008 02:21:58 +0100
From:	Matthew Garrett <mjg59@...f.ucam.org>
To:	Dave Jones <davej@...emonkey.org.uk>,
	maximilian attems <max@...o.at>, linux-kernel@...r.kernel.org,
	mingo@...e.hu, cking <colin.king@...onical.com>,
	Dominik Brodowski <linux@...inikbrodowski.net>
Subject: Re: [PATCH] Enable speedstep for sonoma processors.

On Tue, Jun 03, 2008 at 01:42:18PM -0400, Dave Jones wrote:

> This patch has been floating around for years.
> So long, I've forgotten the original reason it wasn't accepted.
> It had something to do with it working for some users, but not others,
> and we can't detect the 'not working' case.

My recollection is that we had no way to work out which voltage table 
was appropriate for a given CPU, so there was a risk of us either over- 
or under-volting the chip. Doing it via ACPI is safe.

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