From: Pavel Machek <pavel@ucw.cz>
To: Andrew Lutomirski <luto@mit.edu>
Cc: linux-kernel@vger.kernel.org, linux-thinkpad@linux-thinkpad.org
Subject: Re: High power consumption after suspend/resume cycle
Date: Sat, 21 Nov 2009 20:05:20 +0100 [thread overview]
Message-ID: <20091121190520.GB2444@ucw.cz> (raw)
In-Reply-To: <cb0375e10910021044n182d696dy8fd566925e46b134@mail.gmail.com>
Hi!
> I'm running a git kernel that's slightly newer than 2.6.32-rc1.
>
> First, thanks for all the great work everywhere on laptop power
> consumption -- on my Lenovo X200s, it looks like Linux is getting
> close to Windows (Windows wins by about 0.7W, except that its power
> usage frequently spikes since Windows apparently still doesn't know
> how to sit still and do nothing, whereas Linux's seems more stable.).
> Windows after a reboot, even running KDE with compositing enabled and
> while connected to wifi, at least after some tweaking.
>
> There's a catch, though: after a suspend/resume cycle, power
> consumption goes up by over well over a watt. (On a system that draws
> about 7 watts before suspending, that's a big deal.) I've tried
> turning off X, suspending with 'echo mem > /sys/power/state' to avoid
> any distro scripts running, and manually restoring SATA power saving
> settings, but it still happens. I even tried unbinding e1000e and
> both USB drivers, unloading the i2400 (wimax) driver, iwlagn, and
> iwlcore, and it still happens. This is 100% reproducible, and I'd be
> happy to test things.
>
> This could be a BIOS bug I suppose (although I'm running the latest
> BIOS), but Windows 7 does not have this problem at all.
>
> Any ideas about what to try or what subsystem to blame?
Well, on thinkpad x60 power consumption is .3W *lower*.
You could try comparing lspci -vvv before and after... but this is
deep magic and hard to debug.
--
(english) http://www.livejournal.com/~pavelmachek
(cesky, pictures) http://atrey.karlin.mff.cuni.cz/~pavel/picture/horses/blog.html
prev parent reply other threads:[~2009-11-21 19:05 UTC|newest]
Thread overview: 6+ messages / expand[flat|nested] mbox.gz Atom feed top
2009-10-02 17:44 Andrew Lutomirski
2009-10-02 19:29 ` Andrew Lutomirski
2009-10-02 21:37 ` Rafael J. Wysocki
2009-10-03 15:58 ` Andrew Lutomirski
2009-10-04 9:17 ` The Holy ettlz
2009-11-21 19:05 ` Pavel Machek [this message]
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