linux-kernel - Re: mmc0 power consumption

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Message-ID: <20061112144939.GB4371@ucw.cz>
Date:	Sun, 12 Nov 2006 14:49:40 +0000
From:	Pavel Machek <pavel@....cz>
To:	Trifon Trifonov <triffon@...il.com>
Cc:	linux-kernel@...r.kernel.org
Subject: Re: mmc0 power consumption

Hi!

>  I would like to report an issue with my O2Micro 4-in-1 
>  Card reader. I am using kernel 2.6.17-10. Actually, the 
> device works properly (although it wasn't like that with 
> 2.6.15). I am just troubled by getting messages in the 
> syslog about the mmc0 device consuming too much power 
> after issuing ACPI suspend to RAM. I also don't have 

mmc controller is probably confused. Try unloading its driver before
suspend. reloading it after resume to see if it *really* eats more
power.

> obvious problems with suspending, except that after the 
> first suspend it will no longer suspend by closing the 
> lid, so I have to do this manually. Also, after the 

Either usb problem or acpi broken after resume. Verify that
/proc/acpi/events work after resume, report to bugzilla.kernel.org if
not.

> first suspend, statistics show that battery consumption 
> of my laptop seems to rise. So I suspect that something 
> isn't right with the suspend.

Well, on my x60 power consumption goes *down* after suspend,
suggesting something is wrong there, too... but finding what went
wrong is almost impossible.

Ouch, check with top for runaway threads.

						Pavel
-- 
Thanks for all the (sleeping) penguins.
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