linux-kernel - Re: cpufreq doesn't seem to work in Intel Q9300

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Date:	Mon, 11 Aug 2008 22:43:38 -0700
From:	"S K" <nospamnoham@...il.com>
To:	"Andi Kleen" <andi@...stfloor.org>
Cc:	"Zhao Yakui" <yakui.zhao@...el.com>,
	"Thomas Renninger" <trenn@...e.de>,
	"Alan Jenkins" <alan-jenkins@...fmail.co.uk>,
	linux-kernel@...r.kernel.org, linux-acpi@...r.kernel.org
Subject: Re: cpufreq doesn't seem to work in Intel Q9300

Wow! Didn't mean to start a "tech war" here (point's at the long
thread arguing the use of p4-clockmod).

>> It works in Windows XP, so I'm not sure if it's only a BIOS issue.
>
> On Windows platform drivers sometimes provide a replacement DSDT
> that might enable cpufreq. If that's the case there's nothing
> we can do really on the Linux side. You might be able to extract
> that DSDT from somewhere and supply it to Linux as a replacement
> DSDT, but that's not a supported configuration in the kernel.

I don't remember installing any special driver for Windows XP.
Since you claim that as a possibility, is there something that I can look
for to check if this is the case?

The reason I'm questioning this so much is because I plan to contact
Shuttle tech support and try to get them to fix this if it really is a BIOS
issue. But I need valid points to make sure they don't pass on the
blame and slip away. They do seem to release BIOS updates now and then
so I'm hoping I can coax them to release one.

>> If it's not that simple, then care to impart some knowledge?
>
> If you can't get your BIOS to provide the necessary methods
> then useful Linux cpufreq won't work. It's that simple.
> p4-clockmod aka throttling might work, but it doesn't actually
> save energy and often causes severe performance problems.

I definitely don't want to use anything that will have a drastic
effect on performance.

Thanks,
SK
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