linux-kernel - Re: [Bug 10797] Battery is drained after poweroff

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Message-ID: <20081007222829.GT6604@elf.ucw.cz>
Date:	Wed, 8 Oct 2008 00:28:29 +0200
From:	Pavel Machek <pavel@...e.cz>
To:	"Renato S. Yamane" <yamane@...mondcut.com.br>
Cc:	Auke@...e.cz, " <auke-jan.h.kok@...el.com>"@suse.cz,
	linux-kernel@...r.kernel.org, rjwysocki@...k.pl,
	power-management_other@...nel-bugs.osdl.org
Subject: Re: [Bug 10797] Battery is drained after poweroff


> >>>> ...and it is not linux problem because it works okay on my thinkpad. See?
> >>>
> >>> Yes, this is a Linux problem (at least in release >= 2.6.22)
> >>> This happening *only* in Linux (Kernel >=2.6.22).
> >>
> >> Wow, now that's useful info.
> 
> I don´t comment this before because we already said this in bug reports
> (links above).

Sorry about that. lkml has rather big traffic.

> >> I guess you _could_ do git bisect? ;-).
> 
> So sorry, but I really don´t now how can I do this.
> I´m an user, not developer. Can you send me a "how-to" about git
> bisect?

http://kerneltrap.org/node/11753

There may be better HOWTOs around.

> >>> And is impossible find wich device eats power (eaten current is too low,
> >>> and is not enought to make hot).
> >>
> >> So how fast is it eating power... can you estimate Watts eaten?
> 
> Eaten ~5% of battery each 10h.

Lets assume 40Wh battery... 0.5% per hour... that means 200 hours to
empty. 0.5% per hour is 40 * 0.005 Wh/h = 0.2 W AFAICT... hmm, that's
quite low. Debugging this will not be easy :-(.
									Pavel 

-- 
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