Bug#607924: Power management
On Dec 16 2010, Phillip Susi wrote:
> Powernowd used to accomplish the same thing as ACPI P-states by
> directly manipulating the amd k8 cpu registers.
No, it doesn't. It is just a userspace governor and, despite the name,
it is not tied to AMD cpus.
> The kernel now has drivers to perform frequency control using either
> ACPI, or the amd or intel cpu specific registers.
Unless you happen to have a CPU (Intel, BTW) that can only have its
frequency scaled using something other than ondemand/conservative in
their stock form and you have to use the P4 clock modulation.
I have some patches to the ondemand cpufreq regulator, but it will need
a lot of fine tuning to make ondemand work (if at all). OTOH, using
powernowd usually works OK for my computer.
And I am not even talking about some other architectures (e.g., PowerPC)
where there is some support for frequency scaling, but where there is no
ACPI.
See http://bugs.debian.org/609638 for instance.
I think that I may not (yet) be willing to adopt it, but I am sure
willing to co-maintain it or make the occasional QA upload from time to
time, so that I can keep things in shape and close some of the most
pressing bugs.
Regards,
--
Rogério Brito : rbrito@{mackenzie,ime.usp}.br : GPG key 1024D/7C2CAEB8
http://www.ime.usp.br/~rbrito : http://meusite.mackenzie.com.br/rbrito
Projects: algorithms.berlios.de : lame.sf.net : vrms.alioth.debian.org
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