linux-kernel - Re: [patch 0/3] AHCI Link Power Management

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Message-Id: <20070613092607.4ddf0f79.kristen.c.accardi@intel.com>
Date:	Wed, 13 Jun 2007 09:26:07 -0700
From:	Kristen Carlson Accardi <kristen.c.accardi@...el.com>
To:	Pavel Machek <pavel@....cz>
Cc:	Tejun Heo <htejun@...il.com>,
	Arjan van de Ven <arjan@...ux.intel.com>, jeff@...zik.org,
	james.bottomley@...eleye.com, linux-ide@...r.kernel.org,
	linux-scsi@...r.kernel.org, linux-kernel@...r.kernel.org,
	Jens Axboe <jens.axboe@...cle.com>
Subject: Re: [patch 0/3] AHCI Link Power Management

On Wed, 13 Jun 2007 11:04:30 +0200
Pavel Machek <pavel@....cz> wrote:

> Hi!
> 
> > >> I'm not sure about this.  We need better PM framework to support 
> > >> powersaving in other controllers and some ahcis don't save much
> > >> when only link power management is used,
> > > 
> > > do you have data to support this?
> > 
> > Yeah, it was some Lenovo notebook.  Pavel is more familiar with the
> > hardware.  Pavel, what was the notebook which didn't save much power
> > with standard SATA power save but needed port to be completely turned off?
> 
> Thinkpad x60. Some one Kristen probably used while developing the
> patch :-).

Yes - that confirms my conclusion that the first patch just wasn't
done correctly - cause when I measure the power savings with a power
meter on the X60 with my patches I see ~ 1W.
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