linux-kernel - Re: [Bug 10797] Something is consuming power after shutdown

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Message-ID: <20080526084458.6acce426@infradead.org>
Date:	Mon, 26 May 2008 08:44:58 -0700
From:	Arjan van de Ven <arjan@...radead.org>
To:	"Renato S. Yamane" <yamane@...mondcut.com.br>
Cc:	linux-kernel@...r.kernel.org
Subject: Re: [Bug 10797] Something is consuming power after shutdown

On Mon, 26 May 2008 09:59:47 -0300
"Renato S. Yamane" <yamane@...mondcut.com.br> wrote:

> <http://bugzilla.kernel.org/show_bug.cgi?id=10797>
> <http://bugs.debian.org/cgi-bin/bugreport.cgi?bug=481493>
> 
> After poweroff, something still working and consuming power. So I
> loss ~4% of my battery charge in each 12h.
> 
> If I shutdown my laptop using Kernel 2.6.24/25 when battery is 100%, 
> after 12h my battery charge go to 96% (this information is checked
> with kpowersave and with LED available in my laptop that change color
> from blue to yellow when battery is not FULL).
> 
> If I shutdown this same laptop by WinXP (I have a dual boot), nothing 
> change. So, my battery still have 100% after 12h (or more).
> 
> I see a similar problem in EeePC (the problem is with snd_hda_intel 
> driver), but I don't have this driver loaded:

the most obvious cause could be Wake-on-Lan, that leaves a part of the
system active (specifically, the network card). With the "ethtool"
program you can queary and set the state of this.

Similarly, but less likely, there is wake-on-serial and wake-on-usb, in
theory those are possible too but I've yet to see one of those on any
of my machines.

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