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

[Peter Ganzhorn <peter.ganzhorn@googlemail.com>]

What Intel chipsets do include "AHCI chipset"?
I guess you are talking about the SATA controller of certain new Intel 
chipsets, aren't you?
Just recently I noticed that my new notebooks SATA controller won't work 
with the libata Intel ICH* drivers, though ICH8 was mentioned in the 
description.
My SATA controller identifies as "Intel Corporation Mobile SATA AHCI 
Controller" and seems to work with libata AHCI.
I was wondering when support for this controller will be added through 
the ICH* driver, but is it possible that this SATA controller is 
supposed to be used with the standard AHCI driver?

The chipset is an i965 (ICH8M).

Peter


John Fremlin wrote:
> Tejun Heo has made an excellent patch for saving power with the AHCI
> chipset. It saves about 1 W on my Thinkpad X60s.
>
> This patch will stop the ports when they are idle. To turn it on, 
>
>      echo 1 > /sys/module/libata/parameters/powersave
>
> This is very different from the patch I posted a while ago turning on
> a few bits in the CMD register (ALPE and ASP) and which Intel is
> apparently now trying. That only saves around 250mW. Tejun's patch
> saves about 1 W. It should also make the ALPE and ASP stuff irrelevant
> because it performs the same operation in software where better
> information about usage is (theoretically) available.
>
> I have updated the patch for 2.6.22-rc4. That is the extent of my
> involvement - if it works, thank Tejun Heo. But problems are quite
> likely to have been introduced by my clumsy update, so if it doesn't
> work, blame me first.
>
>   
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