Date: Mon, 14 Nov 2005 17:08:07 +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: <20051114160807.GB31670@poupinou.org> In-Reply-To: <20051114093719.GA31670@poupinou.org> References: <200511140957.00179.thierry@herbelot.com> <20051114093719.GA31670@poupinou.org>
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On Mon, Nov 14, 2005 at 10:37:19AM +0100, Bruno Ducrot wrote: > 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. > Hrmm, I remember now that an Athlon-XP can be changed somewhat. Maybe this page <http://www.tomshardware.com/cpu/20041001/index.html>; could help. -- Bruno Ducrot -- Which is worse: ignorance or apathy? -- Don't know. Don't care.
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