On Tue, Jan 24, 2006 at 09:37:24PM +0100, Marius Schrecker wrote: > > Tom Dombrosky wrote: > >> On 1/24/06, *Steve Adeff* <[EMAIL PROTECTED] <mailto:[EMAIL PROTECTED]>> > >> wrote: > >> > >> On Tuesday 24 January 2006 12:34, Michael Starks wrote: > >> > I have been thinking of using a laptop CPU to save power on > >> > a new MythTV system. Basically, I'd like to be able to use > >> > the cpuspeed daemon to drop the CPU speed when there isn't > >> > a lot going in. Has anyone done with with a full-size > >> > mainboard? Any other tips? > >> > >> laptop CPU's use different sockets, etc. I believe some of > >> the new mini boards (BTX or something?) use laptop cpu's. I > >> also believe desktop cpu's support the cpu speed daemons. > >> > >> The Athlon laptop cpus use the same socket. They will work fine. > > > > A really minor modificatio can turn a normal Athlon XP into a > > mobile athlon too - which enables you to use the athcool stuff > > under linux. It's pretty straight forward and there's plenty of > > stuff on doing it out there. > > What about the 64 family, any mods there? I'm using an Athlon 64 > 3700+ San Diego (socket 939) which has pretty good voltage/speed > stepping, although I'd love to be able to drop the lowest step even > more. If anyone knows a mod for that I'd love to know! The kernel > module seems to read the stepping info direct from the cpu or bios, > and I haven't found a way to manipulate this manually, although > googling suggests that a further 10% cut in voltage should be > possible.
How slow are you trying to go?
I have an Athlon64 3500+ Winchester. By default, the cpufreq-ondemand
governor only lets it go from 2.2GHz down to 1.8GHz. I had to tweak it
manually to drop it down to 1.0GHz (nothing available in between):
# cpufreq-set --min 1000000 --governor ondemand
[This is software only; no mucking around with voltage on the
motherboard.]
--Rob
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