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
Date: Wed, 27 Jul 2005 04:20:47 -0700 [thread overview]
Message-ID: <20050727112046.GI16709@atomide.com> (raw)
In-Reply-To: <20050727080051.GF4115@elf.ucw.cz>
* 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
next prev parent reply other threads:[~2005-07-27 11:21 UTC|newest]
Thread overview: 9+ messages / expand[flat|nested] mbox.gz Atom feed top
2005-07-25 14:13 Power consumption HZ250 vs. HZ1000 Marc Ballarin
2005-07-25 15:53 ` Pavel Machek
2005-07-25 19:02 ` Marc Ballarin
2005-07-26 23:28 ` dean gaudet
2005-07-27 7:51 ` Tony Lindgren
2005-07-27 8:00 ` Pavel Machek
2005-07-27 11:20 ` Tony Lindgren [this message]
2005-07-25 20:14 ` Bill Davidsen
-- strict thread matches above, loose matches on Subject: below --
2005-07-26 5:08 Brown, Len
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