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Date: Wed, 27 Jul 2005 04:20:47 -0700
From: Tony Lindgren <tony@atomide.com>
To: Pavel Machek <pavel@ucw.cz>
Cc: Marc Ballarin <Ballarin.Marc@gmx.de>, linux-kernel@vger.kernel.org
Subject: Re: Power consumption HZ250 vs. HZ1000
Message-ID: <20050727112046.GI16709@atomide.com>
References: <20050725161333.446fe265.Ballarin.Marc@gmx.de> <20050725155322.GA1046@openzaurus.ucw.cz> <20050727075156.GC25827@atomide.com> <20050727080051.GF4115@elf.ucw.cz>
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* Pavel Machek <pavel@ucw.cz> [050727 01:00]:
> Hi!
> 
> > > USB devices prevent entering C3 and any interesting powersaving,
> > > try without USB...
> > 
> > Why do USB devices prevent C3? If it was because of the timer polling
> > in the root hub, I believe that should be fixed now.
> > 
> > Or is there some other reason?
> 
> Yes. UHCI zas keeps doing DMA all the time.... It can be worked
> around, but it means proper usb powermanagment support.

OK, thanks for clarifying that.

Tony