linux-kernel - Re: [PATCH 1/1] cpufreq: eeepc 900 frequency scaling driver

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Message-ID: <4939B3C3.8060205@compton.nu>
Date:	Fri, 05 Dec 2008 23:05:39 +0000
From:	Tom Hughes <tom@...pton.nu>
To:	Thomas Renninger <trenn@...e.de>
CC:	Cristiano Prisciandaro <cristiano.p@...net.ch>,
	Dave Jones <davej@...hat.com>, cpufreq@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH 1/1] cpufreq: eeepc 900 frequency scaling driver

Thomas Renninger wrote:

> The biggest problem I see with these "special" ACPI cpufreq interface is:
> Can there be Asus/eeepcs which provide these ACPI functions (maybe dummies on
> future machines?), but can still be switched via the spec conform and more 
> efficient acpi-cpufreq driver via PSS tables?

So should we tie this driver to particular DMI signature(s) then? As far 
as I know it is only useful for the Eee 900 and possibly the 701 when 
running later BIOSes.

> BTW: Have you tried out how much power (or at least battery life time) you
> win?

Running with wifi and the screen off, and the CPU busy (doing m5sum of 
/dev/zero) I get 2:37 run time at 900MHz and 3:09 at 630MHz so the 
increase in run time is about 20% on that test.

Tom

-- 
Tom Hughes (tom@...pton.nu)
http://www.compton.nu/
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