Date: Mon, 14 Nov 2005 10:37:19 +0100 From: Bruno Ducrot <ducrot@poupinou.org> To: Thierry Herbelot <thierry@herbelot.com> Cc: freebsd-acpi@freebsd.org Subject: Re: No powerNow/cpufreq for a desktop Athlon-XP ? Message-ID: <20051114093719.GA31670@poupinou.org> In-Reply-To: <200511140957.00179.thierry@herbelot.com> References: <200511140957.00179.thierry@herbelot.com>
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On Mon, Nov 14, 2005 at 09:56:58AM +0100, Thierry Herbelot wrote: > Hello, > > I'm using FreeBSD 6.0 on an Athlon-based desktop machine. I have loaded the > acpi and cpufreq kernel modules, but powerd does not want to start : > 'powerd: lookup freq: No such file or directory' > > From a little googling, it seems that cpufreq will not work on this machine as > PowerNow is active only on mobile Athlons (see for example > http://forums.pcper.com/showthread.php?t=357591) > > Am I correct ? or is there any way to enable powernow on a desktop Athlon ? > Some people reported that it's possible to use powernow on athlon-based desktop (report under Linux). I don't know the full detail though, but IIRC you have to buy a low-powered processor, and change the driver code in order to add the differents entry for the differents states available. On the other hand, it is not possible to change the voltages associated (this require a special VRM part, available only on mobile systems). I'm sure this would not save power then (especially because all athlon-xp support a very good C2 power state), though this will likely allow you to cool the processor. Cheers, -- Bruno Ducrot -- Which is worse: ignorance or apathy? -- Don't know. Don't care.
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