[PATCH] AHCI powersaving and port-stopping (2.6.22-rc4)

[Stefan Blum]

On Monday 11 June 2007 21:44, Kristen Carlson Accardi wrote:

> I've updated the hardware based patches and posted to the mailing list -
> they do indeed save anywhere from .6-1.5 watts depending on the system,
> on my X60 they save about a watt.  I don't think that a hardware based
> solution is irrelevant at all - it will usually be able to make faster
> and more accurrate decisions about when to place the link into lower
> power state than software could.
>

Hi, I just installed the patches available under
http://www.kernel.org/pub/linux/kernel/people/kristen/patches/SATA/alpm/
on a vanilla 2.6.22-rc4 kernel and can see the respective sysfs entries which 
are set to "max_power". However, I can't change the value via 
echoing "med_power" or "min_power" - it stays at "max_performance". Is there 
anything else I have to do in the first place?

Regards, Stefan