linux-kernel - Re: [RFC][PATCH 12/12] PM / r8169: Add simplified run-time PM support

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Message-ID: <20091227200147.GJ11737@elf.ucw.cz>
Date:	Sun, 27 Dec 2009 21:01:47 +0100
From:	Pavel Machek <pavel@....cz>
To:	"Rafael J. Wysocki" <rjw@...k.pl>
Cc:	pm list <linux-pm@...ts.linux-foundation.org>,
	LKML <linux-kernel@...r.kernel.org>,
	Linux PCI <linux-pci@...r.kernel.org>,
	ACPI Devel Maling List <linux-acpi@...r.kernel.org>,
	Alan Stern <stern@...land.harvard.edu>,
	Jesse Barnes <jbarnes@...tuousgeek.org>,
	Matthew Garrett <mjg59@...f.ucam.org>,
	Oliver Neukum <oliver@...kum.org>,
	Shaohua Li <shaohua.li@...el.com>,
	Bjorn Helgaas <bjorn.helgaas@...com>,
	Francois Romieu <romieu@...zoreil.com>,
	Len Brown <lenb@...nel.org>
Subject: Re: [RFC][PATCH 12/12] PM / r8169: Add simplified run-time PM
 support

On Sun 2009-12-27 20:48:37, Rafael J. Wysocki wrote:
> On Tuesday 15 December 2009, Pavel Machek wrote:
> > Hi!
> > 
> > > Use the PCI run-time power management framework to add simplified
> > > run-time PM support to the r8169 driver.  Namely, make the driver
> > > suspend the device when the link is off and set it up for generating
> > > wake-up event after the link has been detected again.
> > 
> > Nice!
> > 
> > Do you have any idea how much power it saves?
> 
> No, but there should be a power meter somewhere here ...
> 
> I'll let you know if I can find it.

On notebooks, you can often use

pavel@amd:/data/l/linux-msm/arch/arm/mach-msm$ cat
/proc/acpi/battery/BAT0/state 
present:                 yes
capacity state:          ok
charging state:          charged
present rate:            0 mW
remaining capacity:      71830 mWh
present voltage:         16277 mV

...present rate is often usable-enough.
								Pavel

-- 
(english) http://www.livejournal.com/~pavelmachek
(cesky, pictures) http://atrey.karlin.mff.cuni.cz/~pavel/picture/horses/blog.html
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