linux-kernel - Re: usb still sucks battery in -rc7-mm1

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Date:	Sun, 24 Sep 2006 16:49:59 +0200
From:	Alexander Gran <alex@...ns.eu>
To:	Pavel Machek <pavel@....cz>
Cc:	kernel list <linux-kernel@...r.kernel.org>,
	Greg KH <greg@...ah.com>,
	Linux usb mailing list 
	<linux-usb-devel@...ts.sourceforge.net>
Subject: Re: usb still sucks battery in -rc7-mm1

Perhaps your cpu cannot go into deep c states? At least my IBm T40p has that 
problem, when USB is enabled.

regards
Alex

Am Sonntag, 24. September 2006 11:08 schrieb Pavel Machek:
> Hi!
>
> I made some quick experiments, and usb still eats 4W of battery
> power. (With whole machine eating 9W, that's kind of a big deal)...
>
> This particular machine has usb bluetooth, but it can be disabled by
> firmware, and appears unplugged. (I did that). It also has fingerprint
> scanner, that can't be disabled, but that does not have driver (only
> driven by useland, and was unused in this experiment).
>
> Any ideas?
> 								Pavel

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